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Colorado system directory

Find a community water system

Search every Colorado community water system with a current nitrate result. Open a system to see its latest reading, reporting date, nitrate band and population served.

1,033

systems with a current result

7,148,969

people served by them

294

systems carrying a supplier result

51

systems at or above 5 mg/L

7

systems listed with older records

How to read the directory: each system is placed in a band by its most recent reported result in the rolling three-year window. Purchased-water systems carry their supplier's result and are tagged. Bands describe how strongly human activity, read from nitrate, has marked a water source; they are not a safety verdict. Also listed: 7 systems whose latest report predates the window, marked “no current result” - the dated record is on the system's own page, and it is counted in no figure here.

Showing 1,040 of 1,040 systems

0-9

4 Way Ranch Md 2Natural background0.05 mg/LJan 2026150 served 96 Pipeline Co Incpurchased waterHuman impact likely2.20 mg/LAug 2025285 served

A

A And B Wa IncNatural background0.05 mg/LOct 2025100 served Academy WsdNatural background0.05 mg/LJan 2026750 served Advance Mhppurchased waterHealth-study range6.56 mg/LJun 2026175 served Advenir French Quarterpurchased waterNatural background0.08 mg/LMar 20263,447 served Agate WaNatural background0.05 mg/LFeb 2026152 served Town of AguilarNatural background0.40 mg/LDec 2025447 served Town of AkronHuman impact clear3.80 mg/LMay 20262,379 served Alameda Wsdpurchased waterNatural background0.08 mg/LMar 20262,480 served City of AlamosaNatural background0.20 mg/LJan 202611,271 served Aldasoro Ranch HocNatural background0.05 mg/LApr 2026412 served Allenspark WsdNatural background0.05 mg/LAug 2025340 served Town of AlmaNatural background0.30 mg/LOct 2025460 served Alpensee WdNatural background0.50 mg/LJan 2026168 served Alpine Lakes Ranch WcNatural background0.11 mg/LFeb 2026158 served Alpine Mountain Ranch MdNatural background0.40 mg/LOct 202525 served Alpine Village MhpHealth-study range6.90 mg/LOct 202580 served Alpine Vista Villagepurchased waterNatural background0.05 mg/LMar 2026313 served Animas WcNatural background0.41 mg/LSep 20253,096 served Annunciation HeightsNatural background0.50 mg/LJan 2025260 served Antelope Hills Assocpurchased waterNatural background0.10 mg/LJan 2025265 served Town of AntonitoNatural background0.58 mg/LAug 2025981 served Apache Mhppurchased waterNatural background0.03 mg/LJun 2026120 served Apple & Cherry Ridge Villagepurchased waterNatural background0.05 mg/LMar 2026350 served Apple Tree ParkNatural background0.30 mg/LAug 20251,160 served Arabian Acres MdNatural background0.10 mg/LFeb 2026325 served Arapahoe Cnty WwwaNatural background0.05 mg/LApr 202631,000 served Arapahoe MhpNatural background0.70 mg/LJan 202627 served Arapahoe WcHuman impact clear4.80 mg/LMar 202699 served Arbordale Acres Mhppurchased waterNatural background0.05 mg/LMar 2026901 served Aristocrat Ranchette Water Projectpurchased waterNatural background0.05 mg/LApr 20261,715 served Town of ArribaHealth-study range7.50 mg/LApr 2026216 served Arrowhead MhpNatural background0.05 mg/LJan 2026135 served City of ArvadaNatural background0.07 mg/LFeb 2026171,610 served Asgard Subdivision WaHealth-study range5.00 mg/LMay 202680 served City of AspenNatural background0.10 mg/LFeb 202531,100 served Aspen Equestrian Blue Creek RanchNatural background0.60 mg/LAug 2025300 served Aspen Mesa EstatesHuman impact likely1.10 mg/LFeb 2026225 served Aspen Mtn View SubdHuman impact likely1.60 mg/LApr 2026150 served Aspen Ridge Mhcpurchased waterNatural background0.05 mg/LMar 2026302 served Aspen Springs MdNatural background0.01 mg/LApr 2025290 served Aspen Terrace Mobile Parkpurchased waterNatural background0.08 mg/LMar 2026200 served Aspen Village MdNatural background0.90 mg/LAug 2025300 served Town of Aultpurchased waterNatural background0.05 mg/LJul 20254,220 served City of AuroraNatural background0.41 mg/LMay 2026533,407 served Avilla Eastlakepurchased waterHuman impact likely1.02 mg/LSep 2025410 served Avondale WsdHuman impact likely1.60 mg/LMay 20251,615 served

B

Baca Grande WsdNatural background0.20 mg/LAug 20252,006 served Bailey WsdNatural background0.40 mg/LFeb 2026483 served Bancroft Clover Wsdpurchased waterNatural background0.08 mg/LMar 202644,000 served Barr Lake RvpNatural background0.05 mg/LJan 2026204 served Town of BasaltNatural background0.90 mg/LJul 20252,357 served Baseline Wdpurchased waterNatural background0.05 mg/LMar 2026820 served Battlement Mesa MdNatural background0.10 mg/LJan 20264,100 served Baxter Water And ServicesHuman impact likely1.00 mg/LApr 2025350 served Town of BayfieldNatural background0.01 mg/LJan 20262,300 served Bear Creek LoaNatural background0.31 mg/LNov 2025190 served Bear Creek Wsdpurchased waterNatural background0.08 mg/LMar 202630,000 served Beehive Water AssociationNatural background0.05 mg/LMay 2026154 served Bella Vistapurchased waterNatural background0.05 mg/LFeb 2026131 served Belleview Christian CollegeNatural background0.05 mg/LJan 2026460 served Bellyache Ridge MdHuman impact likely1.00 mg/LFeb 2026257 served Town of BennettNatural background0.05 mg/LDec 20254,400 served Bents Fort Wcpurchased waterNatural background0.30 mg/LJul 2025900 served Town of BerthoudNatural background0.05 mg/LJan 202614,211 served Town of BethuneHuman impact clear4.00 mg/LSep 2025195 served Beulah Water Works DistrictNatural background0.05 mg/LFeb 2026445 served Beverly Hills Mutual WcNatural background0.20 mg/LApr 2026325 served Big Elk Meadows WaHuman impact likely1.10 mg/LMay 2026405 served Big Pines CampgroundHuman impact clear3.60 mg/LFeb 202672 served Billings Mhppurchased waterNatural background0.10 mg/LFeb 2026110 served Black Canyon Estates Mhppurchased waterNatural background0.10 mg/LMay 2026188 served City of Black HawkNatural background0.40 mg/LFeb 202615,167 served Town of BlancaNatural background0.30 mg/LFeb 2025469 served Blue Mountain WdNatural background0.10 mg/LApr 2026350 served Blue River Valley Ranch LakesNatural background0.60 mg/LFeb 2026150 served Blue Sky Ranch Inc Assoc of OwnersNatural background0.41 mg/LAug 2025180 served Blue Valley MdNatural background0.10 mg/LFeb 2026410 served Bobcat Meadows MdNatural background0.10 mg/LJan 2026470 served Bone Mesa Domestic WdNatural background0.70 mg/LApr 2025400 served Bonvue Water And Sanitation Districtpurchased waterNatural background0.08 mg/LMar 2026350 served Town of BooneNatural background0.40 mg/LAug 2025263 served City of BoulderNatural background0.10 mg/LAug 2025166,080 served Boulder Meadows Mhppurchased waterNatural background0.10 mg/LAug 20251,657 served Boulder Ridge Mhppurchased waterNatural background0.05 mg/LMar 2026897 served Bow Mar Wsdpurchased waterNatural background0.08 mg/LMar 2026899 served Town of BransonNatural background0.50 mg/LFeb 2026131 served Town of BreckenridgeNatural background0.10 mg/LNov 202528,315 served Briggsdale WcNatural background0.05 mg/LApr 2026303 served City of BrightonHuman impact clear4.60 mg/LFeb 202656,304 served Brighton Village Llcpurchased waterHuman impact clear4.60 mg/LFeb 202677 served Bristol WsdNatural background0.10 mg/LSep 2025151 served Britanie Ridge WsHuman impact likely1.32 mg/LApr 2026245 served Brook Forest WdHuman impact likely1.40 mg/LDec 2025998 served Town of Brooksidepurchased waterNatural background0.05 mg/LApr 2026438 served Broomfield City And County ofNatural background0.03 mg/LFeb 2026106,153 served City of BrushNatural background0.62 mg/LSep 20255,122 served Brush Creek Wdpurchased waterNatural background0.20 mg/LFeb 2026516 served Buckhorn Ranch WsNatural background0.50 mg/LAug 2025205 served Buckskin Valley SubdivisionNatural background0.05 mg/LMar 202628 served Town of Buena VistaNatural background0.20 mg/LApr 20263,776 served Buena Vista Correctional FacilityNatural background0.80 mg/LSep 20251,700 served Buffalo Creek WdHuman impact likely2.00 mg/LDec 2025125 served Buffalo Mountain MdNatural background0.40 mg/LApr 20252,650 served Buffalo Ridge EstatesNatural background0.05 mg/LJan 202690 served City of BurlingtonHealth-study range9.20 mg/LJun 20263,720 served Buttermilk Mdpurchased waterNatural background0.10 mg/LFeb 2025200 served Byers WsdNatural background0.05 mg/LMar 20261,000 served

C

Town of CalhanNatural background0.10 mg/LMar 2026780 served Callicotte RanchNatural background0.40 mg/LMar 202633 served Camelot Property Owners AssocNatural background0.10 mg/LJan 202660 served Town of CampoHuman impact likely2.40 mg/LNov 2025150 served Candlewood Parkpurchased waterNatural background0.05 mg/LApr 2026800 served City of Canon CityNatural background0.05 mg/LApr 202634,800 served Canon City Mhp And Self Storagepurchased waterNatural background0.05 mg/LApr 2026166 served Canterbury Parkpurchased waterNatural background0.00 mg/LJul 20251,240 served Canyon Creek EstatesNatural background0.37 mg/LMar 2026140 served Canyon Ridgepurchased waterNatural background0.00 mg/LJul 2025625 served Capulin WdHuman impact likely1.30 mg/LDec 2025250 served Town of CarbondaleHuman impact likely1.20 mg/LOct 20256,700 served Carter Lake Filter PlantNatural background0.05 mg/LApr 202611 served Casa Del Rio SubdNatural background0.50 mg/LMar 202573 served Casa Estates Mhppurchased waterNatural background0.05 mg/LMay 20251,117 served Castle Park Mhppurchased waterHuman impact likely1.00 mg/LMay 2026191 served Castle Pines North MdNatural background0.05 mg/LNov 202512,800 served Castle Pines Village MdNatural background0.05 mg/LMay 20265,656 served Town of Castle RockHuman impact likely1.00 mg/LMay 2026106,822 served Catamount Md Lake PropertyNatural background0.33 mg/LJun 2025219 served Cathedral WcNatural background0.37 mg/LApr 2026200 served Cattle Creek WuaNatural background0.30 mg/LJul 202547 served Cavanaugh Hills WsNatural background0.05 mg/LApr 2026286 served Cave Creekpurchased waterNatural background0.05 mg/LFeb 20261,025 served Cavern Springs Mhc, LlcNatural background0.32 mg/LApr 2026300 served Cedar Mountain Village Mhppurchased waterNatural background0.01 mg/LSep 2025475 served Cedar Village Mhppurchased waterNatural background0.41 mg/LMay 2026130 served Town of CedaredgeNatural background0.40 mg/LNov 20252,400 served Town of CenterNatural background0.50 mg/LAug 20252,575 served City of Central CityNatural background0.05 mg/LJun 20263,750 served Central Weld Cnty Wdpurchased waterNatural background0.05 mg/LApr 20267,662 served Chair Mtn Ranch Hoa Filing 1Natural background0.05 mg/LMay 202537 served Chancellors Mhcpurchased waterHuman impact likely2.40 mg/LMay 2026100 served Chaparral Village Mhppurchased waterNatural background0.08 mg/LMar 2026303 served Chateau Chaparrel CgHuman impact likely1.20 mg/LJun 2026240 served Chatfield South Wdpurchased waterNatural background0.08 mg/LMar 2026312 served Town of CherawNatural background0.10 mg/LMar 2025254 served Cherokee MdHealth-study range6.30 mg/LMay 202629,610 served Cherry Acres Mhppurchased waterNatural background0.20 mg/LMay 202595 served Cherry Creek Valley Wsdpurchased waterNatural background0.08 mg/LMar 202622,000 served Cherry Creek Village Wdpurchased waterNatural background0.08 mg/LMar 20269,215 served Cheyenne Mountain Estates Mhppurchased waterNatural background0.05 mg/LJul 2025472 served Town of Cheyenne WellsHealth-study range6.90 mg/LJan 2026840 served Chicosa Water Users Associationpurchased waterNatural background0.05 mg/LMay 202640 served Chipeta Wdpurchased waterNatural background0.10 mg/LMay 20263,802 served Cimarron Creekpurchased waterNatural background0.10 mg/LMay 2026560 served Cimarron Villagepurchased waterNatural background0.03 mg/LFeb 20261,010 served Clearwater MdNatural background0.10 mg/LJan 2026200 served Clifton WdNatural background0.05 mg/LApr 202634,500 served Cloverleaf Colorado Llcpurchased waterNatural background0.05 mg/LJul 20251,007 served Town of Coal Creekpurchased waterNatural background0.01 mg/LFeb 2025350 served Coalby Domestic WcNatural background0.30 mg/LApr 2025239 served Town of Cokedalepurchased waterNatural background0.05 mg/LMay 2026120 served Town of CollbranNatural background0.90 mg/LMar 2025678 served Collins Aire Mhcpurchased waterNatural background0.05 mg/LJul 2025946 served Colorado Centre MdNatural background0.50 mg/LJan 20263,675 served Colorado City MdNatural background0.40 mg/LFeb 20262,755 served Colorado Mtn College SvcHuman impact likely2.80 mg/LJul 2025715 served Colorado Springs UtilitiesNatural background0.00 mg/LJul 2025464,111 served Columbine Lake WsdNatural background0.32 mg/LJul 2025428 served Columbine Lakes Hoapurchased waterNatural background0.08 mg/LMar 2026843 served Commerce Heightspurchased waterHealth-study range6.56 mg/LJun 2026130 served Consolidated Bell Mtn Ranch MdNatural background0.05 mg/LNov 20251,000 served Consolidated Glacier View Meadows AssocNatural background0.70 mg/LMay 2026395 served Consolidated Mutual Maple GroveNatural background0.05 mg/LJan 202581,400 served Copper Key Village Mhppurchased waterNatural background0.10 mg/LAug 2025260 served Copper Mountain Consolidated MdNatural background0.40 mg/LAug 20255,785 served City of CortezNatural background0.09 mg/LOct 20258,770 served Costilla County WsNatural background0.69 mg/LAug 2025561 served Cottonwood Mhppurchased waterHealth-study range6.56 mg/LJun 202660 served Cottonwood Springs MhpNatural background0.36 mg/LApr 2026750 served Cottonwood WsdNatural background0.05 mg/LFeb 202610,867 served Country Estates Mobile Home Parkpurchased waterNatural background0.05 mg/LFeb 2026297 served Country Gardens MhpNatural background0.80 mg/LNov 2025115 served Country Homes Land Copurchased waterNatural background0.08 mg/LMar 2026100 served Countryside Estates Mhcpurchased waterNatural background0.16 mg/LJul 2025502 served Countryside of Greeleypurchased waterNatural background0.05 mg/LFeb 2026435 served Countryside of Longmontpurchased waterNatural background0.05 mg/LJul 2025775 served Countryside Village of Denverpurchased waterno current resultlast Jul 2023863 served Coyote Hills WsHuman impact likely1.54 mg/LMay 202684 served Cragmont WcHuman impact clear3.10 mg/LOct 202550 served City of CraigNatural background0.01 mg/LSep 20258,930 served Town of CrawfordNatural background0.40 mg/LSep 2025477 served Crawford Mesa WaNatural background0.45 mg/LDec 2025486 served City of CreedeNatural background0.41 mg/LNov 20251,965 served Creekside South Estates Metro DistrictNatural background0.05 mg/LFeb 2026160 served Crest Mobile Estates Mhppurchased waterHuman impact likely2.40 mg/LMay 2026100 served Town of Crested ButteNatural background0.05 mg/LJul 20252,440 served Crested Butte SouthHuman impact likely1.00 mg/LAug 20252,000 served Crestline Manorpurchased waterNatural background0.00 mg/LJul 2025505 served Crestone WsNatural background0.70 mg/LSep 2025293 served Crestview Wsdpurchased waterNatural background0.08 mg/LMar 202623,756 served Crestwood EstatesNatural background0.05 mg/LJan 2026140 served City of Cripple CreekNatural background0.17 mg/LMay 20262,817 served Town of CrookHuman impact clear4.00 mg/LJul 2025182 served Cross L EstatesHuman impact likely2.10 mg/LMar 202650 served Town of Crowleypurchased waterHealth-study range6.90 mg/LApr 2025188 served Crowley County WaHuman impact likely1.80 mg/LApr 2026530 served Crowley County WsHealth-study range6.90 mg/LApr 20250 served Crowley Ranch ReserveNatural background0.12 mg/LMar 202649 served Crystal River Country Estates Water CoNatural background0.91 mg/LMay 202640 served Crystal ValleyNatural background0.71 mg/LOct 2025100 served Csu Main And West Housing Campuspurchased waterNatural background0.12 mg/LNov 202527,375 served Cucharas Sanitation And Water DistrictNatural background0.25 mg/LNov 2025343 served

D

City of Daconopurchased waterNatural background0.05 mg/LApr 20266,900 served Dakota Ridge HoaNatural background0.58 mg/LSep 2025130 served Dallas Creek WcNatural background0.05 mg/LApr 20261,059 served Dallas Meadows Community AssocNatural background0.40 mg/LMay 2026120 served Town of DebequeNatural background0.10 mg/LMar 2025911 served Deep Creek Creede HavenNatural background0.47 mg/LAug 202586 served Deep Creek Mountain Valley EstatesNatural background0.50 mg/LOct 202531 served Deer Creek WdHuman impact clear4.30 mg/LJan 2026792 served Town of Deer TrailNatural background0.05 mg/LMar 20261,648 served Deerwood Service Company LlcNatural background0.05 mg/LSep 202591 served Town of Del NorteNatural background0.46 mg/LDec 20251,429 served City of Deltapurchased waterNatural background0.10 mg/LMay 20268,700 served Denver Cascade Mhppurchased waterno current resultlast Jul 20231,200 served Denver Water BoardNatural background0.08 mg/LMar 20261,287,000 served Derby Village Mobile Home Parkpurchased waterHealth-study range6.56 mg/LJun 202681 served Deutsch Domestic WaterNatural background0.70 mg/LMay 2025246 served Town of DillonNatural background0.05 mg/LAug 20253,254 served Dillon Valley DistrictNatural background0.20 mg/LAug 20253,063 served Town of DinosaurNatural background0.05 mg/LAug 2024350 served Divide Mpc Md No 1Human impact likely2.50 mg/LMar 2026679 served Divide SouthNatural background0.10 mg/LApr 202674 served Divide Water Providers IncNatural background0.50 mg/LApr 2026570 served Town of DoloresNatural background0.30 mg/LSep 20251,626 served Dominion Wsdpurchased waterHuman impact likely1.00 mg/LMay 20260 served Donala WsdNatural background0.05 mg/LJan 20266,421 served Dot MhpHuman impact likely2.00 mg/LAug 2025229 served Town of Dove CreekNatural background0.01 mg/LMay 2025850 served City of DurangoNatural background0.03 mg/LJun 202633,787 served Durango Falfa Mhc LlcNatural background0.14 mg/LMay 202640 served Durango Jcmhp, LlcNatural background0.03 mg/LMay 2026100 served Durango North Villagepurchased waterNatural background0.41 mg/LSep 2025150 served Durango Regency MhpNatural background0.17 mg/LDec 2025200 served Durango West Md No 1Natural background0.01 mg/LFeb 2025750 served Durango West Md No 2Natural background0.03 mg/LApr 2026930 served

E

Town of EadsNatural background0.70 mg/LSep 2025656 served Town of EagleNatural background0.10 mg/LApr 20267,511 served Eagle Crest Mhppurchased waterNatural background0.40 mg/LMay 2026441 served Eagle River Village MhpNatural background0.50 mg/LFeb 20261,500 served Eagle River WsdNatural background0.05 mg/LJul 202551,515 served Eagles Watch HoaNatural background0.05 mg/LNov 202583 served Earles Subdivision WcHuman impact likely1.59 mg/LMay 202540 served East Alamosapurchased waterNatural background0.20 mg/LJan 20261,453 served East Boulder County Wdpurchased waterNatural background0.05 mg/LMar 2026300 served East Cherry Creek Valley WsdNatural background0.40 mg/LApr 202666,130 served East Dillon WdHuman impact likely1.30 mg/LFeb 20262,501 served East End WaNatural background0.05 mg/LDec 202570 served East Florence Wapurchased waterNatural background0.01 mg/LFeb 2025326 served East Larimer County Wdpurchased waterNatural background0.05 mg/LJul 202527,944 served East Valley MdNatural background0.41 mg/LOct 2025230 served Eastern Adams Co MdNatural background0.05 mg/LJan 20262,485 served Eastgate Village Manufactured Homespurchased waterHuman impact clear4.60 mg/LFeb 20261,500 served Eastside MhpHuman impact likely1.30 mg/LFeb 202640 served Town of Eatonpurchased waterNatural background0.05 mg/LJul 20257,328 served Town of EckleyHuman impact likely2.00 mg/LDec 2025235 served Eden Valley InstituteNatural background0.04 mg/LAug 202480 served Edgemont Ranch MdNatural background0.01 mg/LDec 20251,200 served City of Edgewaterpurchased waterNatural background0.08 mg/LMar 20265,300 served El Jebel MhpNatural background0.29 mg/LMay 20261,962 served El Moro Hoehne Pipeline Assocpurchased waterNatural background0.05 mg/LMay 2026655 served El Morro Mobile Estatespurchased waterNatural background0.00 mg/LJul 2025504 served El Rancho Florida MdNatural background0.93 mg/LAug 2025400 served El Rocko MhpNatural background0.60 mg/LMar 202580 served Elbert County Hwy 86 WdNatural background0.05 mg/LJul 20251,040 served Elbert Creek Water CoNatural background0.15 mg/LMay 2026750 served Elbert WsdNatural background0.80 mg/LJan 2026300 served Eldorado Municipal SystemNatural background0.50 mg/LJan 2026308 served Elegant Hills Mhppurchased waterNatural background0.05 mg/LDec 2025170 served Elephant Rock MhpHuman impact likely2.60 mg/LJun 202560 served Elevado Estates LlcNatural background0.05 mg/LFeb 2026250 served Eleven Mile Ranch AssociationNatural background0.10 mg/LDec 202572 served Town of ElizabethNatural background0.30 mg/LJul 20254,523 served Elk Meadows EstatesHuman impact likely2.00 mg/LAug 2025230 served Elk Run Homeowners CorporationNatural background0.01 mg/LMar 2026125 served Elk Springs HoaNatural background0.39 mg/LJun 2025416 served Elk Valley Mhppurchased waterNatural background0.01 mg/LSep 202579 served Elkhorn Ranch Md No 1Natural background0.11 mg/LJan 2026530 served Ellicott Utilities Company Llcpurchased waterHealth-study range6.30 mg/LMay 2026272 served Emerald Acres Mobile Home Parkpurchased waterNatural background0.00 mg/LJul 2025280 served Town of EmpireNatural background0.05 mg/LFeb 2026500 served City of EnglewoodHuman impact clear3.60 mg/LFeb 202657,332 served Town of ErieNatural background0.06 mg/LMay 202540,061 served Erie Meadowspurchased waterNatural background0.06 mg/LMay 202541 served Escalante Villagepurchased waterNatural background0.03 mg/LJun 202662 served Estates At BromleyNatural background0.05 mg/LSep 2025150 served Town of Estes ParkNatural background0.15 mg/LFeb 202616,722 served Eureka WcNatural background0.60 mg/LJan 2025498 served City of Evanspurchased waterNatural background0.05 mg/LFeb 202619,369 served Evergreen Lake CompanyNatural background0.12 mg/LJun 2026431 served Evergreen MdNatural background0.10 mg/LFeb 202615,750 served Excell Lawson VillageNatural background0.40 mg/LJan 202690 served

F

Town of FairplayNatural background0.20 mg/LApr 2026909 served Fairplay MhpNatural background0.40 mg/LJan 2026215 served Falcon Area Water And WastewaterNatural background0.05 mg/LMay 20261,223 served Falcon Heights PoaNatural background0.10 mg/LMar 2026300 served Falcon Highlands MdNatural background0.05 mg/LDec 20251,050 served Falls Creek RanchNatural background0.85 mg/LSep 2025215 served Farmers Korner MhpNatural background0.80 mg/LDec 2025159 served Fayette WcNatural background0.05 mg/LAug 202575 served City of Federal Heightsno current resultlast Jul 202311,678 served Town of Firestonepurchased waterNatural background0.40 mg/LMay 202627,798 served Town of FlaglerHealth-study range9.00 mg/LApr 20262,160 served Town of FlemingHuman impact clear4.82 mg/LMar 2026446 served City of FlorenceNatural background0.01 mg/LFeb 20257,500 served Florida River Estates Hoa IncNatural background0.24 mg/LNov 2025239 served Forest Glen Sports Assoc IncNatural background0.30 mg/LDec 202576 served Forest Hills Md Riva ChaseNatural background0.70 mg/LFeb 2025400 served Forest Lakes MdNatural background0.05 mg/LMay 20261,049 served Forest Lakes MdNatural background0.41 mg/LFeb 20251,699 served Forest View Acres WdNatural background0.05 mg/LMay 2026772 served Forrest Grove EstatesNatural background0.24 mg/LSep 202592 served Fort LyonNatural background0.50 mg/LJun 2025300 served City of FountainHuman impact likely2.40 mg/LMay 202625,130 served Fountain Valley AuthorityNatural background0.00 mg/LJul 202513 served Four Mile Ranch HoaNatural background0.80 mg/LMar 202570 served Town of FowlerHealth-study range6.80 mg/LMay 20261,169 served Fox Estates HoaNatural background0.02 mg/LOct 202550 served Fox Hill Water Association IncNatural background0.05 mg/LJun 202544 served Fox Run Meadows HoaHuman impact likely1.70 mg/LFeb 202636 served Foxhill MdNatural background0.05 mg/LJan 2026123 served Foxridge Farms MhpNatural background0.05 mg/LJan 20261,440 served Franklin Mobile Home Parkpurchased waterNatural background0.08 mg/LMar 2026513 served Town of FraserNatural background0.77 mg/LJun 20252,150 served Town of Frederickpurchased waterNatural background0.05 mg/LApr 202617,173 served Freeman CreekNatural background0.22 mg/LAug 202588 served Friendly Village of Aurora Mhppurchased waterNatural background0.41 mg/LMay 20261,786 served Friendly Village of Greeley Mhppurchased waterNatural background0.05 mg/LFeb 2026660 served Friendly Village of The Rockiespurchased waterHuman impact likely1.02 mg/LSep 20251,046 served Town of FriscoNatural background0.70 mg/LMar 20264,495 served Front Rangepurchased waterNatural background0.03 mg/LFeb 20261,620 served Fruitland Domestic WcNatural background0.05 mg/LDec 2025335 served City of Ft CollinsNatural background0.12 mg/LNov 2025179,901 served Ft Collins Loveland Wdpurchased waterNatural background0.05 mg/LMar 202663,532 served Ft Garland WsdHuman impact likely1.00 mg/LDec 2025477 served City of Ft LuptonNatural background0.10 mg/LAug 202512,099 served City of Ft MorganNatural background0.05 mg/LApr 202612,000 served

G

G And M Mobile Home ParkHealth-study range5.12 mg/LDec 202530 served Galambs Mobile Home And Rv ParkNatural background0.20 mg/LApr 2025130 served Gambel Oaks HoaNatural background0.05 mg/LApr 2026350 served Game Trail Association IncNatural background0.40 mg/LFeb 2025480 served Garcia Domestic WuaNatural background0.63 mg/LJul 2025100 served Garden Meadowspurchased waterNatural background0.08 mg/LMar 2026250 served Garden ValleyHuman impact clear3.10 mg/LJan 2026900 served Gardner Water And Sanitation DistNatural background0.54 mg/LMar 2026400 served Garfield Estates Mhppurchased waterNatural background0.05 mg/LApr 2026178 served Gateway Canyons WsNatural background0.20 mg/LNov 2025370 served Gateway MdNatural background0.19 mg/LApr 2026160 served Genesee WsdNatural background0.20 mg/LJan 20263,920 served Town of GenoaHealth-study range9.90 mg/LJan 2026153 served Town of GeorgetownNatural background0.20 mg/LJan 20265,315 served Town of Gilcrestpurchased waterNatural background0.05 mg/LApr 20261,150 served Ginters Grove Domestic Water Corppurchased waterNatural background0.40 mg/LNov 202562 served City of Glendalepurchased waterNatural background0.08 mg/LMar 20264,400 served Glenview Owners AssocNatural background0.80 mg/LOct 2025195 served City of Glenwood SpringsNatural background0.20 mg/LFeb 20269,428 served City of GoldenNatural background0.10 mg/LJul 202538,288 served Golden Terrace Southpurchased waterNatural background0.10 mg/LJul 2025425 served Golden Terrace Villagepurchased waterNatural background0.10 mg/LJul 2025580 served Golden Terrace Westpurchased waterNatural background0.10 mg/LJul 2025825 served Goodman PoaNatural background0.42 mg/LDec 202596 served Grace Mar WuaNatural background0.30 mg/LJan 202650 served Town of GranadaNatural background0.05 mg/LDec 2025515 served Granada Rural Water AuthorityNatural background0.05 mg/LNov 2025378 served Granby Jones MhpHuman impact likely1.10 mg/LFeb 2026201 served Granby Town of North Service AreaNatural background0.60 mg/LMar 20262,025 served Granby Town of South Service AreaNatural background0.30 mg/LFeb 20262,300 served Granby Town of West Service AreaNatural background0.60 mg/LMay 20260 served Grand County Water No 1Natural background0.10 mg/LApr 20245,400 served City of Grand JunctionNatural background0.06 mg/LSep 202526,000 served Town of Grand LakeNatural background0.60 mg/LJul 20252,035 served Grand Meadow of Longmont Mhppurchased waterNatural background0.05 mg/LJul 2025255 served Grand View MhpNatural background0.05 mg/LJan 2026250 served Grandview MhpHuman impact likely1.70 mg/LDec 202590 served Greatrock North WsdHuman impact likely2.00 mg/LMay 20261,250 served City of GreeleyNatural background0.05 mg/LFeb 2026132,310 served Greeley Mobile Manorpurchased waterNatural background0.05 mg/LFeb 2026180 served Greeley Rv ParkHuman impact clear3.90 mg/LJun 2026164 served Green Acres MhpNatural background0.05 mg/LJan 2026325 served Green Acres MhpNatural background0.88 mg/LJul 2025130 served Green Acres Mobile Home Parkpurchased waterNatural background0.05 mg/LFeb 2026180 served Green Mountain Wsdpurchased waterNatural background0.08 mg/LMar 202649,400 served Greetville Carbondale Waterpurchased waterNatural background0.05 mg/LMay 2026210 served Town of GroverNatural background0.05 mg/LJan 2026154 served Guadalupe WaNatural background0.78 mg/LDec 202542 served City of GunnisonNatural background0.40 mg/LJun 20259,610 served Gunnison County WsdNatural background0.10 mg/LJan 2025800 served Town of GypsumNatural background0.20 mg/LMay 202615,272 served

H

Hamilton Creek MdNatural background0.05 mg/LAug 2025200 served Hammond Pipelinepurchased waterNatural background0.38 mg/LJun 202570 served Hanson Mesa Domestic Pipeline Co Incpurchased waterNatural background0.05 mg/LJul 2025250 served Happy Scenes Ws IncNatural background0.11 mg/LSep 2025209 served Harmony Village Mhppurchased waterNatural background0.12 mg/LNov 20251,215 served Town of HartmanNatural background0.05 mg/LJan 202561 served Harvey Martinez Trailer Courtpurchased waterNatural background0.10 mg/LMay 202625 served Hasty WcNatural background0.05 mg/LSep 2025244 served Town of HaswellHealth-study range7.90 mg/LMay 202655 served Hawkridge HoaHuman impact likely1.70 mg/LApr 202642 served Town of HaxtunHealth-study range5.50 mg/LDec 2025963 served Town of HaydenNatural background0.53 mg/LJan 20253,982 served Hazeltine Heights WaterNatural background0.05 mg/LMay 2025261 served Heartwood Co Op HousingNatural background0.01 mg/LMar 202660 served Heeney Water DistrictNatural background0.50 mg/LJun 2025150 served Hermosa VillageNatural background0.16 mg/LDec 202598 served Herons Nest Rv ParkNatural background0.40 mg/LJun 202590 served Hi Land Acres WsdNatural background0.05 mg/LJan 2026350 served Hickory Villagepurchased waterNatural background0.12 mg/LNov 2025816 served Hidden Lake Communitypurchased waterNatural background0.10 mg/LMay 202683 served Hidden Springs RanchNatural background0.14 mg/LAug 202527 served Hidden Valley Hoa Water Companypurchased waterNatural background0.38 mg/LJun 2025120 served Hidden Valley Water Districtpurchased waterNatural background0.10 mg/LFeb 2026155 served High Plains WuaNatural background0.50 mg/LFeb 2026200 served High View Wdpurchased waterNatural background0.08 mg/LMar 20264,000 served Highland Lakes WdHealth-study range7.20 mg/LMay 2026875 served Highland Mobile Home Parkpurchased waterNatural background0.05 mg/LJul 2025107 served Highlands Ranch WsdNatural background0.31 mg/LJul 2025103,444 served Hillcrest Village MhpNatural background0.05 mg/LJan 20261,505 served Town of Hillrosepurchased waterHealth-study range6.90 mg/LMay 2026310 served Hilltop WcNatural background0.05 mg/LDec 2025285 served Holbrook Center Soft WaNatural background0.34 mg/LNov 202554 served Holiday Hills Villagepurchased waterno current resultlast Jul 20231,190 served Holiday Village Mobile Home Communitypurchased waterNatural background0.00 mg/LJul 2025360 served Holland Hills MdHuman impact likely1.70 mg/LMay 2026225 served Town of HollyNatural background0.05 mg/LJan 2026800 served City of HolyokeHealth-study range5.40 mg/LOct 20252,540 served Homestead Improvement Association Incpurchased waterNatural background0.30 mg/LJul 202587 served Homestead TrailsNatural background0.20 mg/LJul 2025258 served Homestead WcNatural background0.20 mg/LMay 20261,000 served Hoover Hills Wsdpurchased waterNatural background0.10 mg/LAug 2025662 served Hope Ditch CoNatural background0.05 mg/LJan 202663 served Town of Hot Sulphur SpringsNatural background0.05 mg/LJun 2025687 served Town of HotchkissNatural background0.05 mg/LJul 20252,050 served Huajatolla Valley Estates IncNatural background0.05 mg/LAug 2025132 served Town of HudsonNatural background0.05 mg/LMar 20263,350 served Town of HugoHuman impact likely2.20 mg/LJan 2026885 served

I

City of Idaho SpringsNatural background0.05 mg/LMay 202610,432 served Idledale WsdNatural background0.40 mg/LFeb 2026350 served Town of IliffHealth-study range5.20 mg/LApr 2026328 served Ilium Valley WsNatural background0.50 mg/LMar 2026322 served Independence WsdNatural background0.05 mg/LApr 2026567 served Indian Hills WdHealth-study range5.70 mg/LMay 20261,300 served Indian Trails Water LlcNatural background0.32 mg/LFeb 2026110 served Inspiration Valley MhpNatural background0.05 mg/LFeb 2026250 served Inverness WsdNatural background0.05 mg/LMar 20268,140 served Iron Clad Modular Home Parkpurchased waterNatural background0.01 mg/LSep 202530 served Island Cove Parkpurchased waterNatural background0.03 mg/LJun 2026143 served

J

Town of JamestownNatural background0.20 mg/LDec 2025280 served Town of JohnstownNatural background0.20 mg/LJan 202627,295 served Joint Water Purification PlantHuman impact likely1.00 mg/LFeb 20260 served Town of JulesburgHealth-study range6.27 mg/LMay 20261,225 served

K

Kannah CreekNatural background0.05 mg/LSep 2025435 served Karval Water Users IncHuman impact clear3.80 mg/LMar 2026102 served Town of KeenesburgHuman impact clear3.70 mg/LMay 20264,650 served Keeton Ranch Waterpurchased waterHuman impact likely1.40 mg/LJan 202570 served Ken Caryl West Ranch WdHuman impact likely1.60 mg/LFeb 2026140 served Ken Caryl Wsdpurchased waterNatural background0.08 mg/LMar 202612,000 served Kersey Wdpurchased waterNatural background0.05 mg/LApr 20262,101 served Keystone RanchHuman impact likely1.10 mg/LSep 2025670 served Town of KimHuman impact clear3.10 mg/LDec 2025116 served Kimberly Hills Mhppurchased waterno current resultlast Jul 20232,005 served Kingdom Park CourtNatural background0.30 mg/LFeb 202670 served Kings Row HoaHuman impact likely1.20 mg/LJul 2025100 served Kiowa Water And Wastewater AuthorityHuman impact clear3.80 mg/LDec 2025910 served Town of Kit CarsonHuman impact clear3.30 mg/LApr 2026326 served Kk Water AssocNatural background0.80 mg/LApr 202570 served Knolls At Durango HoaNatural background0.21 mg/LMar 2026150 served Town of KremmlingNatural background0.05 mg/LFeb 20251,859 served Kv Hoa IncNatural background0.50 mg/LApr 2025580 served

L

Town of La JaraNatural background0.49 mg/LJan 2025825 served City of La JuntaNatural background0.30 mg/LJul 20258,320 served La Plata Archuleta Water Districtpurchased waterNatural background0.01 mg/LJan 2026510 served La Plata West Water Authoritypurchased waterNatural background0.03 mg/LOct 2025354 served Town of La Sallepurchased waterNatural background0.05 mg/LApr 20262,010 served Town of La VetaNatural background0.20 mg/LMar 2026850 served City of LafayetteNatural background0.05 mg/LMar 202628,700 served Lafayette Gardenspurchased waterNatural background0.05 mg/LMar 2026207 served Lago Vista Mobile Home Parkpurchased waterNatural background0.05 mg/LMar 2026842 served Town of Lake CityNatural background0.10 mg/LApr 2025587 served Lake Creek Meadows MdNatural background0.30 mg/LFeb 2026407 served Lake Durango WaNatural background0.03 mg/LOct 20251,577 served Lake Forest Mutual WcNatural background0.05 mg/LFeb 2026250 served Lake Fork MhpNatural background0.30 mg/LFeb 2026487 served Lake Sanchez EstatesHuman impact likely1.21 mg/LFeb 202534 served Lakehurst Wsdpurchased waterNatural background0.08 mg/LMar 202612,000 served Lakeshore Mobile Home ParkHuman impact likely2.20 mg/LFeb 202658 served City of Lakewoodpurchased waterNatural background0.08 mg/LMar 20266,000 served City of LamarNatural background0.80 mg/LSep 20257,500 served Lamplighter Estates Mhppurchased waterNatural background0.01 mg/LSep 2025250 served Lamplighter Mhppurchased waterno current resultlast Jul 2023651 served Lamplighter Mobile Home Parkpurchased waterNatural background0.05 mg/LApr 2026420 served Lamplighter Rhppurchased waterNatural background0.00 mg/LJul 2025643 served Laplata Vista Estates Hoapurchased waterNatural background0.03 mg/LOct 202568 served Lark Meadows WaNatural background0.05 mg/LMar 202675 served Town of LarkspurNatural background0.05 mg/LJan 2026275 served Larkspur SubdNatural background0.30 mg/LAug 2025118 served City of Las AnimasNatural background0.60 mg/LSep 20252,139 served Last Dollar PudNatural background0.01 mg/LMar 202596 served Lazear Domestic WcNatural background0.70 mg/LJul 2025178 served Lazy Days MhvHealth-study range5.30 mg/LJul 202451 served Lazy Diamond A SubdNatural background0.30 mg/LOct 202525 served Lazy Glen HoaNatural background0.60 mg/LAug 2025322 served Lazy O RanchNatural background0.19 mg/LApr 202627 served Left Hand WdNatural background0.05 mg/LMay 202620,280 served Lefthand Wsd Lake Pinespurchased waterNatural background0.05 mg/LMay 2026250 served Lightner Creek MhpNatural background0.07 mg/LJul 202590 served Town of LimonNatural background0.10 mg/LFeb 20255,080 served Limon Correctional Facilitypurchased waterNatural background0.10 mg/LFeb 20251,289 served Lions Ridge EstatesNatural background0.80 mg/LMar 202563 served Little Elk CreekNatural background0.20 mg/LMar 2026150 served Little Thompson Wdpurchased waterNatural background0.05 mg/LApr 202625,654 served Lmp Coop Mhppurchased waterNatural background0.05 mg/LJul 202575 served Town of LochbuieHuman impact clear4.30 mg/LJun 20266,518 served Town of Log Lane Villagepurchased waterHealth-study range6.90 mg/LMay 20261,006 served City of LongmontNatural background0.05 mg/LJul 2025102,866 served Longs Peak WdNatural background0.05 mg/LApr 20263,200 served Longview Mhppurchased waterNatural background0.05 mg/LMay 20261,000 served Longview Mobile Home Parkpurchased waterNatural background0.08 mg/LMar 2026147 served Lookout Mountain WdNatural background0.05 mg/LJan 20261,378 served Los Prados HoaNatural background0.17 mg/LOct 202545 served Los Ranchitos HoaNatural background0.03 mg/LSep 2025120 served City of LouisvilleNatural background0.05 mg/LMay 202620,975 served Louviers WsdNatural background0.20 mg/LJan 2026238 served City of LovelandNatural background0.05 mg/LMar 202695,471 served Loveland Mhppurchased waterNatural background0.05 mg/LMar 2026283 served Town of Lyonspurchased waterNatural background0.05 mg/LJul 20252,990 served

M

Mad Dog WcNatural background0.20 mg/LAug 202560 served Majestic Mhppurchased waterNatural background0.08 mg/LMar 2026232 served Town of ManassaNatural background0.47 mg/LMar 2026976 served Town of MancosNatural background0.06 mg/LFeb 20251,390 served Mancos Rural Water CompanyNatural background0.12 mg/LMar 20251,300 served City of Manitou SpringsNatural background0.10 mg/LJun 20256,938 served Town of ManzanolaHuman impact likely1.20 mg/LAug 2025497 served Maple Grove WdNatural background0.05 mg/LFeb 202635 served Marabou HoaNatural background0.05 mg/LAug 202568 served Marble WcNatural background0.36 mg/LSep 2025113 served May Valley WaNatural background0.05 mg/LOct 20251,500 served Mcclave Wa IncNatural background0.05 mg/LNov 2025378 served Meadow Mtn Water SupplyNatural background0.05 mg/LAug 202576 served Meadow Village Mobile Home Parkpurchased waterNatural background0.05 mg/LFeb 2026150 served Meadowbrook Wdpurchased waterNatural background0.08 mg/LMar 20263,290 served Meadowlark Mobile Home Parkpurchased waterNatural background0.05 mg/LMar 2026125 served Meadowood Village Mhppurchased waterNatural background0.08 mg/LMar 2026125 served Town of MeekerNatural background0.11 mg/LMar 20262,473 served Menoken Wdpurchased waterNatural background0.10 mg/LMay 20264,500 served Meridian Lake ParkNatural background0.05 mg/LJan 2026250 served Meridian MdNatural background0.05 mg/LMar 202523,415 served Meridian Service MdNatural background0.05 mg/LFeb 202612,760 served Town of MerinoHuman impact clear3.20 mg/LNov 2025235 served Mesa Antero SubdNatural background0.40 mg/LJun 2025250 served Mesa Cortina WsdNatural background0.20 mg/LJan 2026466 served Mesa WsdNatural background0.20 mg/LMar 2026330 served Mid Colorado InvestmentNatural background0.10 mg/LJul 20250 served Mid Valley MdNatural background0.31 mg/LApr 20264,588 served Midlands Villagepurchased waterNatural background0.05 mg/LApr 2026893 served Mile High Mobile Home Parkpurchased waterHealth-study range6.56 mg/LJun 2026209 served Mile High Wcpurchased waterNatural background0.03 mg/LFeb 2026700 served Mill Creek WiaNatural background0.10 mg/LFeb 202667 served Millard Mobile Home ParkHuman impact likely1.81 mg/LMay 202590 served Town of Millikenno current resultlast Jul 20239,200 served Milner ParkHuman impact likely2.96 mg/LMar 2026100 served Mineota Estates HoaNatural background0.60 mg/LNov 2025105 served Minnesota Pipelinepurchased waterNatural background0.38 mg/LJun 202572 served Town of MinturnNatural background0.20 mg/LFeb 20261,200 served Mitchell Cooper Ditch PipelineNatural background0.30 mg/LFeb 20261,028 served City of Monte VistaHuman impact likely1.30 mg/LMar 20264,600 served Montezuma Cnty Wd No 1purchased waterNatural background0.05 mg/LDec 2025490 served Montezuma WcNatural background0.05 mg/LDec 202513,797 served City of Montrosepurchased waterNatural background0.10 mg/LMay 202619,305 served Town of MonumentNatural background0.20 mg/LApr 20265,740 served Monument Meadow Village Mhppurchased waterNatural background0.20 mg/LApr 2026250 served Moose Haven CondosNatural background0.90 mg/LFeb 202648 served Moraine Park WsHuman impact likely1.00 mg/LMar 2026100 served Morgan County Quality WdHealth-study range6.90 mg/LMay 20268,116 served Morgan Park Mhppurchased waterNatural background0.20 mg/LFeb 2026117 served Town of MorrisonNatural background0.90 mg/LFeb 20259,887 served Morrison Creek Metro DistrictNatural background0.60 mg/LFeb 2026800 served Mount Crested Butte WsdNatural background0.05 mg/LApr 20263,296 served Mountain MeadowsHuman impact clear4.80 mg/LApr 2026115 served Mountain Mutual WaNatural background0.20 mg/LJun 2025674 served Mountain Shadows Mhppurchased waterHuman impact likely2.40 mg/LMay 202656 served Mountain Shadows Mobile EstatesHuman impact likely2.80 mg/LOct 202545 served Mountain Valley EstatesNatural background0.70 mg/LMay 2025200 served Mountain Valley MhpHuman impact likely1.70 mg/LJul 2025338 served Mountain View Mhppurchased waterNatural background0.05 mg/LJul 2025211 served Mountain View Mobile Home Parkpurchased waterNatural background0.10 mg/LMay 2026193 served Mountain View Village EastNatural background0.40 mg/LFeb 2026226 served Mountain View Village WestHuman impact clear3.40 mg/LFeb 2026440 served Mountain View WuaNatural background0.05 mg/LFeb 2026320 served Town of Mountain VillageNatural background0.36 mg/LFeb 20269,700 served Mountain Vista VillageNatural background0.05 mg/LSep 2025100 served Mountain WsdHuman impact likely1.40 mg/LAug 20251,941 served Mountaindale Cg And CabinsNatural background0.80 mg/LSep 2025228 served Mountainside Estates Mhppurchased waterNatural background0.05 mg/LJan 2025473 served Mt Elbert WaNatural background0.40 mg/LJul 2025170 served Mt Vernon Country ClubHuman impact clear4.50 mg/LApr 2026734 served Mt Werner WdNatural background0.08 mg/LJun 202519,000 served Mustang Water AuthorityNatural background0.01 mg/LSep 20250 served

N

Narrow Gauge Mhppurchased waterNatural background0.01 mg/LJan 2026150 served Town of Naturitapurchased waterNatural background0.01 mg/LSep 2025585 served Navajo River Ranch PoaNatural background0.25 mg/LMar 202640 served Navajo Western Water District EstatesHuman impact likely1.99 mg/LMar 2025145 served Navajo Western Wd ResortsHuman impact clear3.22 mg/LMar 2025341 served Town of NederlandNatural background0.20 mg/LJan 20262,406 served Neighbors of 7Th Street Mhppurchased waterNatural background0.09 mg/LOct 202596 served Neighbors of Dreamland Mhppurchased waterNatural background0.16 mg/LJul 2025115 served Town of New CastleNatural background0.50 mg/LApr 20265,024 served Town of New RaymerNatural background0.05 mg/LFeb 202673 served New Vision MhpNatural background0.05 mg/LMar 2026200 served Newdale Grand Valley WcNatural background0.05 mg/LApr 2025458 served Newell Warnock WaNatural background0.05 mg/LAug 2025160 served No Name Creek WsNatural background0.30 mg/LMar 2026160 served North Carter Lake Wdpurchased waterNatural background0.05 mg/LApr 2026328 served North Holbrook WcNatural background0.05 mg/LMar 202558 served North Lincoln Wsdpurchased waterNatural background0.08 mg/LMar 20261,000 served North Pecos Wsdpurchased waterNatural background0.08 mg/LMar 20262,500 served North Point Estates Mhppurchased waterNatural background0.16 mg/LJul 2025271 served North Shore WsdNatural background0.55 mg/LJul 2025378 served North Table Mountain WsdNatural background0.07 mg/LApr 202610,000 served North Valley Subdivision Utility CompanyNatural background0.91 mg/LJan 202679 served North Washington Street Wsdpurchased waterNatural background0.08 mg/LMar 202614,500 served North Washington WuaNatural background0.25 mg/LOct 202590 served North Weld County Wdpurchased waterNatural background0.05 mg/LJul 202515,890 served Northbrook Villas MhcNatural background0.01 mg/LMay 20261,052 served Northern Colorado WaHuman impact likely1.40 mg/LJan 20264,675 served Northern Douglas County Wsdpurchased waterNatural background0.31 mg/LJul 20256,160 served City of NorthglennNatural background0.25 mg/LMar 202648,927 served Northside Village Mhppurchased waterNatural background0.08 mg/LMar 202655 served Northstar Mobile Home Parkpurchased waterNatural background0.12 mg/LNov 202512 served Norwood Water CommissionNatural background0.05 mg/LDec 20251,700 served Town of Nuclapurchased waterNatural background0.01 mg/LSep 2025875 served Nueva Vida Mobile Home Parkpurchased waterNatural background0.05 mg/LJul 2025266 served Town of Nunnpurchased waterNatural background0.05 mg/LJul 2025499 served

O

Town of Oak CreekNatural background0.05 mg/LApr 2026950 served Oak Meadows Mhppurchased waterNatural background0.09 mg/LOct 2025200 served Oak Meadows Service CompanyNatural background0.21 mg/LJul 2025180 served Oak Meadows Water Associationpurchased waterNatural background0.21 mg/LJul 202550 served Town of Olathepurchased waterNatural background0.10 mg/LMay 20263,015 served Old Homestead MhpHuman impact likely1.79 mg/LMay 2026120 served Olde Stage WdHuman impact clear4.10 mg/LJan 2026250 served Town of Olney SpringsHuman impact likely1.40 mg/LApr 2026399 served Olympic VillageNatural background0.05 mg/LFeb 202675 served Town of OphirNatural background0.12 mg/LFeb 2026193 served Town of Orchard CityNatural background0.20 mg/LMay 20253,100 served Orchard EstatesHuman impact likely1.00 mg/LJul 202564 served Orchard Park Wa Incpurchased waterNatural background0.05 mg/LApr 202678 served Town of OrdwayHuman impact likely2.20 mg/LAug 20251,300 served Town of OtisHealth-study range5.50 mg/LJul 2025600 served City of OurayNatural background0.24 mg/LDec 20251,460 served Overlook Mutual WcNatural background0.40 mg/LApr 202650 served Town of OvidHealth-study range5.45 mg/LJan 2026259 served

P

Pacheco Trailer ParkNatural background0.24 mg/LJul 202536 served Pagels TpHealth-study range5.30 mg/LJun 2026300 served Pagosa Area WsdNatural background0.05 mg/LMay 202611,069 served Paint Brush HillsNatural background0.05 mg/LSep 20254,994 served Town of PalisadeNatural background0.44 mg/LFeb 20263,060 served Town of Palmer LakeNatural background0.05 mg/LMay 20262,686 served Palmer Lake Mobile Home RanchHuman impact likely1.00 mg/LOct 2023268 served Panorama Ranches HoaNatural background0.61 mg/LMar 2026120 served Town of PaoliHuman impact clear4.30 mg/LNov 202542 served Town of PaoniaNatural background0.38 mg/LJun 20252,499 served Town of ParachuteNatural background0.87 mg/LFeb 20261,320 served Paradise Park Mhppurchased waterNatural background0.10 mg/LFeb 2026375 served Paradise Village Coop Mobile Home Parkpurchased waterNatural background0.20 mg/LJan 2026140 served Paradox Pipeline CoNatural background0.23 mg/LAug 2025200 served Park Center WdNatural background0.15 mg/LSep 20254,000 served Park ForestNatural background0.10 mg/LJan 2026930 served Park Place Mhppurchased waterNatural background0.05 mg/LApr 202635 served Park Wc WonderviewHuman impact clear3.70 mg/LFeb 202590 served Parker WsdNatural background0.45 mg/LFeb 202675,949 served Parkville WdNatural background0.40 mg/LDec 20257,500 served Patterson Valley WcNatural background0.05 mg/LNov 202596 served Peach Valley Orchard SubdNatural background0.20 mg/LJul 202527 served Peak View Park LlcNatural background0.60 mg/LApr 2026106 served Peaks Shadow LlcHealth-study range7.70 mg/LFeb 202667 served Town of PeetzHealth-study range7.40 mg/LApr 2026295 served Penrose WdNatural background0.01 mg/LMar 20263,149 served Perry Park WsdNatural background0.80 mg/LFeb 20263,890 served Peyton PinesHuman impact likely2.00 mg/LDec 202556 served Phillips Mobile Home ParkNatural background0.82 mg/LAug 202544 served Town of PhippsburgNatural background0.33 mg/LApr 2026200 served Picture Ranch Mhppurchased waterNatural background0.05 mg/LApr 2026220 served Piedra Park MdNatural background0.03 mg/LMay 2025850 served Town of Piercepurchased waterNatural background0.05 mg/LJul 20251,094 served Pine Brook Hills WdNatural background0.05 mg/LApr 20261,100 served Pine Drive WdNatural background0.20 mg/LMay 2026416 served Pine Lake Villagepurchased waterNatural background0.05 mg/LJul 202565 served Pine Lakes Ranchpurchased waterHuman impact likely1.02 mg/LSep 20251,905 served Pine Wind MhpNatural background0.03 mg/LAug 202560 served Pinery WwdNatural background0.05 mg/LMay 202612,901 served Pinewood Mobile Home Parkpurchased waterNatural background0.05 mg/LJan 202665 served Pinewood Springs WdNatural background0.10 mg/LFeb 2026745 served Pinon Heights MhpNatural background0.03 mg/LJul 202543 served Pinon Hills Water Users AssociationNatural background0.10 mg/LDec 202575 served Pinon Pines Property LlcHuman impact likely1.20 mg/LMar 2025100 served Pinon Wsdpurchased waterNatural background0.05 mg/LMay 202650 served Pinyon Mesa Hoapurchased waterNatural background0.39 mg/LJun 2025125 served Pioneer Lookout WdNatural background0.80 mg/LSep 2025120 served Pioneer Mobile Home Parkpurchased waterNatural background0.08 mg/LMar 2026250 served Pitkin Iron HoaNatural background0.43 mg/LJun 202541 served Pitkin Mesa Pipeline CoNatural background0.30 mg/LFeb 2026295 served Platte Canyon Wsdpurchased waterNatural background0.08 mg/LMar 202619,485 served Town of Plattevillepurchased waterNatural background0.05 mg/LApr 20262,900 served Pleasant Grove Mhppurchased waterNatural background0.05 mg/LMar 2026285 served Pleasant View Estatespurchased waterNatural background0.05 mg/LJan 2025122 served Town of Poncha SpringsNatural background0.50 mg/LFeb 20261,467 served Ponderosa Park AssocNatural background0.10 mg/LAug 2025100 served Poudre Valley Mhcpurchased waterNatural background0.12 mg/LNov 2025985 served Prairie EstatesHealth-study range5.90 mg/LMar 2026220 served Prairie Greens Mhppurchased waterNatural background0.05 mg/LApr 2026654 served Prairie View PoaNatural background0.05 mg/LJun 2025175 served Prairie View Ranch WdNatural background0.40 mg/LJan 2025140 served Prairie WcNatural background0.05 mg/LJan 2026300 served Prince Creek Village HoaNatural background0.33 mg/LSep 202550 served Princeton Estates SubdNatural background0.80 mg/LMar 2026150 served Town of PritchettNatural background0.05 mg/LOct 2025125 served Project 7 WaNatural background0.10 mg/LMay 20260 served Prosperity Lane Wapurchased waterNatural background0.80 mg/LSep 2025260 served Pueblo Board of WwNatural background0.16 mg/LJul 2025114,070 served Pueblo Grande Villagepurchased waterNatural background0.16 mg/LJul 2025504 served Pueblo Pointe Mhc, Llcpurchased waterNatural background0.16 mg/LJul 2025289 served Pueblo West MdNatural background0.20 mg/LFeb 202630,000 served Purgatory MdNatural background0.10 mg/LDec 20251,364 served

Q

Quail Hill Mobile Home Parkpurchased waterNatural background0.00 mg/LJul 2025878 served

R

Rainbow Valley WdNatural background0.10 mg/LAug 2025130 served Ralston Valley Wsdpurchased waterNatural background0.07 mg/LFeb 20261,610 served Town of RamahNatural background0.05 mg/LDec 2025125 served Ranch At Coulter Creek HoaNatural background0.30 mg/LApr 202627 served Ranch At Roaring ForkNatural background0.05 mg/LMay 2025300 served Town of RangelyNatural background0.10 mg/LFeb 20262,495 served Rangeview MdNatural background0.20 mg/LJul 20252,487 served Town of Red CliffNatural background0.20 mg/LFeb 2026469 served Red Rock Valley WdHuman impact likely1.40 mg/LJan 2025200 served Red Sky RanchNatural background0.05 mg/LFeb 2026291 served Red Table Acres HoaHuman impact likely1.10 mg/LJun 202590 served Redhill Forest PomwacaNatural background0.10 mg/LJan 2026388 served Redstone WsdNatural background0.05 mg/LJul 2025180 served Redwood Estatespurchased waterHuman impact likely1.02 mg/LSep 20251,500 served Town of RicoNatural background0.04 mg/LFeb 2026437 served Ridgewood Mobile Home Parkpurchased waterNatural background0.08 mg/LMar 2026196 served Ridgewood WdNatural background0.20 mg/LNov 202484 served Town of RidgwayNatural background0.02 mg/LMar 20261,000 served City of RifleNatural background0.10 mg/LFeb 20269,489 served Rifle Correctional CenterNatural background0.01 mg/LMar 2026287 served Rifle Creek Estates HoaNatural background0.20 mg/LMar 202690 served Rio Grande Water CompanyHuman impact likely1.82 mg/LFeb 2026265 served River Green PoaHuman impact likely1.20 mg/LOct 202547 served River Ranch Village Mhp Llcpurchased waterNatural background0.05 mg/LFeb 2025140 served River Valley Mhcpurchased waterNatural background0.05 mg/LMay 2026803 served River Village LlcNatural background0.60 mg/LJan 202590 served River-Dale RanchNatural background0.30 mg/LJan 202683 served Riverbend CabinsHuman impact likely1.15 mg/LMar 202655 served Riverbend Water And Sewer CompanyNatural background0.49 mg/LSep 2025156 served Riverdale Peaks Ii MdNatural background0.05 mg/LFeb 2026209 served Riverland Lot Owners AssocHuman impact likely2.70 mg/LAug 2025368 served Rivermaze Coop Mhppurchased waterNatural background0.05 mg/LApr 202684 served Rivers Bend Condo AssocNatural background0.41 mg/LMay 202532 served Riverside WcNatural background0.50 mg/LMar 202690 served Riverview CgNatural background0.80 mg/LFeb 2026450 served Riverview SubdHuman impact likely1.10 mg/LMar 202655 served Riverwood Mobile Home Parkpurchased waterNatural background0.10 mg/LMay 202637 served Riviere EstatesNatural background0.30 mg/LFeb 2026211 served Rmnp Headquarters EastNatural background0.10 mg/LJun 2025900 served Roaring Fork MhpNatural background0.17 mg/LDec 2025200 served Roaring Fork WsdNatural background0.81 mg/LJun 20251,912 served Rock Creek MesaNatural background0.05 mg/LJul 2025225 served Town of Rockvalepurchased waterNatural background0.01 mg/LFeb 2025504 served City of Rocky FordHuman impact likely2.00 mg/LMay 20254,443 served Rogers Mesa Wcpurchased waterNatural background0.05 mg/LJul 2025840 served Rolling Plains EstateHealth-study range9.40 mg/LMay 202640 served Town of RomeoHuman impact likely1.28 mg/LDec 2025365 served Rose Park Mhppurchased waterNatural background0.10 mg/LFeb 2026220 served Rosewood Hills Property HoaHuman impact likely1.50 mg/LMar 2026135 served Round Mountain WsdNatural background0.60 mg/LNov 20251,950 served Roxborough Nw Douglas Countypurchased waterNatural background0.31 mg/LJul 2025860 served Roxborough WsdNatural background0.05 mg/LJan 202613,765 served Ruedi Shores MdNatural background0.30 mg/LFeb 2025165 served Town of RyeNatural background0.05 mg/LApr 2025745 served

S

Saddle Ridge Ranch Estates WcNatural background0.05 mg/LMay 202655 served Saddleback Rvpurchased waterNatural background0.10 mg/LJan 2026425 served Saddlehorn Ranch MdNatural background0.05 mg/LMar 202639 served Sage Creek Canyon CorpNatural background0.40 mg/LMar 2026192 served Sage Pointe HoaHuman impact clear3.20 mg/LApr 2026194 served Sage Wuapurchased waterNatural background0.10 mg/LJul 2025800 served Town of SaguacheHuman impact likely1.00 mg/LDec 2025504 served City of SalidaHuman impact likely1.80 mg/LFeb 20255,666 served San Acacio Domestic WaHuman impact likely2.57 mg/LDec 202540 served San Bernardo HoaNatural background0.11 mg/LFeb 2026132 served San Juan Ranch HoaNatural background0.30 mg/LJan 202567 served San Juan River Village MdNatural background0.05 mg/LAug 2025877 served San Lazaro Mfctd Housing CommunityNatural background0.10 mg/LDec 2025844 served San Luis WsdNatural background0.34 mg/LAug 2025629 served Sanctuary of Peace PoaNatural background0.10 mg/LApr 202620 served Town of SanfordNatural background0.36 mg/LMay 2026850 served Sans Souci MhpNatural background0.10 mg/LMay 2026150 served Santa Fe Trail Ranch Mdpurchased waterNatural background0.05 mg/LMay 2026360 served Satank Wapurchased waterHuman impact likely1.20 mg/LOct 202580 served Town of SawpitNatural background0.44 mg/LJun 202559 served Scenic Square SubdHuman impact likely1.08 mg/LMay 202625 served Seaboard Foods LlcHuman impact clear3.59 mg/LMay 2026132 served Security MhpHealth-study range5.30 mg/LMay 2025150 served Security Water DistrictHealth-study range5.80 mg/LApr 202620,000 served Sedalia WsdNatural background0.05 mg/LMay 2026215 served Town of SedgwickHealth-study range6.32 mg/LJan 2026227 served Town of SeibertHealth-study range7.80 mg/LApr 2026296 served Serenity Ridge Vault Connectionpurchased waterNatural background0.05 mg/LApr 2026157 served Town of Severancepurchased waterNatural background0.05 mg/LJul 202511,733 served Shadow Mountain Mobile Home Parkpurchased waterNatural background0.00 mg/LJul 2025132 served Shady Lane Mhppurchased waterHealth-study range6.56 mg/LJun 2026165 served Shambhala Mountain CenterNatural background0.30 mg/LFeb 202690 served Shangrila Mhppurchased waterNatural background0.00 mg/LJul 2025260 served Shannon WsdNatural background0.05 mg/LMay 2026450 served Shawnee WcaHuman impact clear3.50 mg/LMay 202650 served Sheridan Lake WdNatural background0.05 mg/LMar 2025148 served Sheridan MhpNatural background0.05 mg/LFeb 2026480 served Shire Mobile Home Parkpurchased waterNatural background0.05 mg/LFeb 2026150 served Sidney Peak RanchNatural background0.05 mg/LApr 202642 served Sierra Bonita Estatespurchased waterNatural background0.41 mg/LMay 2026122 served Sierra Verde Water Inc.Natural background0.07 mg/LSep 202560 served Sierra Vista HoaNatural background0.05 mg/LJan 2026120 served Signal Mountain Ranch Property Owners WcNatural background0.40 mg/LDec 202566 served Town of SiltNatural background0.05 mg/LSep 20253,536 served Silver Bonnett ParkNatural background0.05 mg/LOct 202545 served Silver Heights WsdNatural background0.05 mg/LApr 2026301 served Town of Silver PlumeNatural background0.20 mg/LFeb 2026180 served Town of SilverthorneNatural background0.60 mg/LFeb 20268,414 served Town of SilvertonNatural background0.15 mg/LFeb 20262,387 served Town of SimlaHuman impact likely2.20 mg/LAug 2025618 served Ski Town VillageNatural background0.05 mg/LAug 2025113 served Skyland MdNatural background0.30 mg/LDec 2025335 served Skylark Mobile Home Communitypurchased waterNatural background0.05 mg/LMar 2026342 served Skylinepurchased waterNatural background0.12 mg/LNov 2025402 served Sleepy Bear MhpNatural background0.74 mg/LApr 2025150 served Sleepy Valley Community Mhppurchased waterNatural background0.00 mg/LJul 2025260 served Smith Creek Crossingpurchased waterNatural background0.60 mg/LMay 2026518 served Snake River WdNatural background0.30 mg/LFeb 20269,900 served Snowmass Village WsdNatural background0.20 mg/LFeb 20266,353 served Soda Springs WaNatural background0.40 mg/LFeb 2026280 served Soldier Canyon Filter PlantNatural background0.05 mg/LJul 20250 served Somerset Domestic WdNatural background0.10 mg/LSep 2025100 served Sopris Village HoaHuman impact likely1.10 mg/LMay 2025425 served South Adams County WsdHealth-study range6.56 mg/LJun 202675,559 served South Fork Heights ApartmentsNatural background0.20 mg/LSep 202580 served Town of South Fork West MunicipalNatural background0.50 mg/LFeb 2026566 served South Lamborn Mesa Water Companypurchased waterNatural background0.38 mg/LJun 202547 served South Sheridan Water And Sewer Distpurchased waterNatural background0.08 mg/LMar 20262,500 served South Side WaNatural background0.03 mg/LSep 202444 served South Swink Water AuthorityNatural background0.05 mg/LMay 2025622 served Southgate Wsdpurchased waterNatural background0.08 mg/LMar 202655,000 served Southwest Horizon RanchNatural background0.55 mg/LJul 2025323 served Southwest Metropolitan Wsdpurchased waterNatural background0.08 mg/LMar 202648,648 served Spanish Peaks Village Tract Ii WaNatural background0.10 mg/LApr 2026138 served Spring Canyon Wsdpurchased waterNatural background0.05 mg/LMar 20262,320 served Spring Park MeadowsNatural background0.56 mg/LFeb 202638 served Spring Valley Md No 1Natural background0.05 mg/LJan 20261,788 served Spring Valley Mutual WaNatural background0.05 mg/LApr 2026100 served Spring View TpHuman impact likely1.76 mg/LMay 2025145 served Town of SpringfieldHuman impact clear4.00 mg/LJun 20251,378 served Springridge SubdHuman impact clear3.20 mg/LJul 2025110 served Spruce Hill DevelopmentNatural background0.20 mg/LFeb 2025277 served St Charles Mesa WdNatural background0.60 mg/LMay 20259,690 served St Marys Glacier WsdNatural background0.20 mg/LJan 2026451 served St Vrain Mhp Llcpurchased waterNatural background0.05 mg/LJul 2025544 served St Vrain Water AuthorityNatural background0.40 mg/LMay 20260 served Stage Run HoaNatural background0.05 mg/LJan 2026150 served Town of Starkvillepurchased waterNatural background0.05 mg/LMay 202662 served Starwood Metropolitan DistrictNatural background0.40 mg/LMar 2026300 served Steamboat Ii MdHuman impact likely1.07 mg/LMar 20261,450 served Steamboat Lake WdNatural background0.02 mg/LFeb 2026411 served City of Steamboat Springspurchased waterNatural background0.08 mg/LJun 20259,950 served City of SterlingHuman impact likely2.80 mg/LApr 202615,100 served Sterling Ranch Cabpurchased waterHuman impact likely1.00 mg/LMay 202611,357 served Stewart Mesa Wcpurchased waterNatural background0.38 mg/LJun 2025250 served Stewarts Mobile Home Parkpurchased waterNatural background0.05 mg/LJul 2025156 served Stonegate MdNatural background0.05 mg/LApr 202515,295 served Stoneybrook Mhppurchased waterNatural background0.05 mg/LFeb 20261,073 served Stoneybrook Pointepurchased waterNatural background0.05 mg/LFeb 2026355 served Storm King Mhppurchased waterNatural background0.20 mg/LFeb 2026135 served Strasburg WsdHuman impact likely1.50 mg/LJul 20252,050 served Stratmoor Hills WsdHuman impact clear4.40 mg/LMay 20266,500 served Town of StrattonHealth-study range5.60 mg/LJul 2025960 served Stucker Mesa Domestic WcNatural background0.10 mg/LApr 202536 served Suburban Estates Mhppurchased waterNatural background0.41 mg/LMay 2026115 served Town of Sugar CityHuman impact likely1.30 mg/LOct 2025240 served Sun Meadow EstatesHuman impact clear4.80 mg/LApr 202675 served Sunflower Valley Pipeline Assnpurchased waterNatural background0.05 mg/LMay 2026312 served Sunlight View Www CompanyHuman impact likely1.60 mg/LMar 2026234 served Sunnyslope HomeownersNatural background0.20 mg/LMay 202529 served Sunrise RanchNatural background0.10 mg/LJan 202675 served Sunrise Trailer ParkHuman impact likely1.40 mg/LMay 202560 served Sunset Hills Mobile Parkpurchased waterNatural background0.00 mg/LJul 2025157 served Sunset Park Mhcpurchased waterNatural background0.05 mg/LMar 2026462 served Sunset Wdpurchased waterNatural background0.05 mg/LJul 2025425 served Sunshine Acres Mhppurchased waterNatural background0.05 mg/LJan 202678 served Sunshine Mesa Domestic WcHuman impact likely1.03 mg/LOct 202576 served Superior Md No 1Natural background0.05 mg/LJan 202617,900 served Swan Meadow Villagepurchased waterHuman impact likely1.30 mg/LFeb 2026455 served Swans Nest MdNatural background0.05 mg/LFeb 2026200 served Town of SwinkNatural background0.30 mg/LMay 2026660 served Swiss Village HoaNatural background0.97 mg/LMay 202695 served

T

Tabernash Meadows WsdHuman impact likely1.50 mg/LApr 2026564 served Table Mesa Village MhpNatural background0.20 mg/LJan 202675 served Tall Pines VillageNatural background0.12 mg/LMar 202660 served Tanglewood WsHuman impact clear4.00 mg/LFeb 202660 served Teller County WsdHuman impact likely2.80 mg/LJan 2026600 served Teller Springs HoaNatural background0.47 mg/LApr 202684 served Town of TellurideNatural background0.10 mg/LJul 20257,900 served Telluride Pines HoaNatural background0.40 mg/LMar 202625 served Terrace Park Mhppurchased waterNatural background0.05 mg/LFeb 2026297 served The Aspens Mobile Home Villagepurchased waterNatural background0.05 mg/LJul 2025318 served The Grove At Alta Ridgepurchased waterHuman impact likely1.02 mg/LSep 20251,300 served The Hideout At Glenwood SpringsNatural background0.07 mg/LApr 202694 served The Meadowspurchased waterNatural background0.41 mg/LMay 2026758 served The Springs Mhppurchased waterHealth-study range6.30 mg/LMay 20261,229 served Third Creek WuaNatural background0.05 mg/LJan 202690 served City of ThorntonHuman impact likely1.02 mg/LSep 2025226,465 served Thornton Estatespurchased waterHuman impact likely1.02 mg/LSep 2025300 served Three Mile TpNatural background0.70 mg/LMay 202550 served Thunderbird WsdNatural background0.05 mg/LJul 2025490 served Timber Creek WdNatural background0.40 mg/LFeb 2025312 served Timber Ridge Mhppurchased waterNatural background0.12 mg/LNov 20251,736 served Timbers WsdNatural background0.03 mg/LJun 2025200 served Todd Creek Village MdNatural background0.60 mg/LFeb 20267,202 served Trail West AssocNatural background0.90 mg/LApr 2025249 served Tranquil Acres WsHealth-study range6.10 mg/LSep 2025180 served Travois HoaNatural background0.05 mg/LSep 2025175 served Tree Haus MdHuman impact likely1.00 mg/LJun 2025248 served Tres Valles WestNatural background0.90 mg/LFeb 202668 served Tri County Wcdpurchased waterNatural background0.10 mg/LMay 202620,490 served Triangle TpNatural background0.10 mg/LDec 202539 served City of TrinidadNatural background0.05 mg/LMay 202611,400 served Trinidad Lake Ranches Poapurchased waterNatural background0.05 mg/LMay 2026200 served Trinidad Manufactured Home Communitypurchased waterNatural background0.05 mg/LMay 2026133 served Triview MdNatural background0.05 mg/LMay 20255,737 served Tucson WcNatural background0.05 mg/LDec 202590 served Turkey Canon Ranch WdNatural background0.20 mg/LMay 2026138 served Tv Hills WaterNatural background0.03 mg/LNov 202538 served Twilight WcNatural background0.10 mg/LMar 202578 served Twin Rivers Mhp, Llcpurchased waterNatural background0.06 mg/LSep 202567 served Town of Two ButtesHealth-study range6.80 mg/LFeb 202664 served Two Rivers VillageNatural background0.05 mg/LOct 2025896 served

U

Upper Surface Creek Domestic WuaNatural background0.05 mg/LMar 20262,800 served Us Air Force Academypurchased waterNatural background0.00 mg/LJul 202516,876 served Us Department of The Army Fort Carsonpurchased waterNatural background0.00 mg/LJul 202548,000 served Ute Heights Community WsNatural background0.05 mg/LFeb 202669 served Ute Pass Wa IncNatural background0.04 mg/LOct 2025120 served Ute WcdNatural background0.10 mg/LFeb 202692,580 served

V

Valley At Winter Park WdNatural background0.20 mg/LMar 202650 served Valley Maint Corp No 1Health-study range7.40 mg/LMar 2026470 served Valley Maint Corp No 2Human impact likely1.80 mg/LMar 202655 served Valley Mobile Home LlcNatural background0.02 mg/LMay 202685 served Valley View Park Mobile Home Communitypurchased waterNatural background0.60 mg/LNov 202544 served Valley Vista EstatesNatural background0.05 mg/LJul 202551 served Valley WcNatural background0.80 mg/LSep 2025270 served Valley Wdpurchased waterNatural background0.08 mg/LMar 202610,000 served Valley West Parkpurchased waterNatural background0.41 mg/LSep 202593 served Valli Hi MhpHealth-study range5.00 mg/LJan 202650 served City of VictorNatural background0.11 mg/LApr 2026491 served Viejo San AcacioNatural background0.32 mg/LAug 202545 served View Ridge Mutual WcNatural background0.17 mg/LJul 202535 served Town of VilasNatural background0.10 mg/LJan 2025137 served Villa Westpurchased waterNatural background0.05 mg/LFeb 2026833 served Villas The Mhppurchased waterNatural background0.05 mg/LJul 202564 served Vineyards Mhcpurchased waterNatural background0.05 mg/LApr 2026150 served Vista Verde Villagepurchased waterNatural background0.05 mg/LDec 2025200 served Vista Village Mhppurchased waterNatural background0.10 mg/LAug 2025750 served Town of VonaHealth-study range7.10 mg/LMar 2026160 served Vroman WcNatural background0.05 mg/LAug 2025125 served

W

Wagon Wheel MhpNatural background0.10 mg/LDec 2025160 served Town of WaldenNatural background0.70 mg/LNov 2025600 served Walden WsdHuman impact likely1.80 mg/LFeb 20251,500 served City of WalsenburgNatural background0.05 mg/LSep 20253,230 served Town of WalshAbove the federal limit11.10 mg/LApr 2026650 served Town of WardNatural background0.10 mg/LNov 2025230 served Warm Springs Owners Mutual WaNatural background0.20 mg/LFeb 2025250 served Water View Condominium AssocNatural background0.41 mg/LMay 202530 served Wattenberg Improvement AssocHuman impact likely2.70 mg/LMay 2026350 served WaysideHuman impact likely1.20 mg/LJan 202640 served Town of WellingtonHuman impact clear4.70 mg/LMay 202611,720 served West Fort Collins Wdpurchased waterNatural background0.12 mg/LNov 20254,000 served West Grand Valley WaNatural background0.05 mg/LFeb 2026100 served West Paonia Domestic Water Companypurchased waterNatural background0.38 mg/LJun 202557 served West Ranch SubdNatural background0.70 mg/LMar 202528 served Westbank Mesa HoaNatural background0.99 mg/LMar 202593 served Westbank Ranch HoaHuman impact likely1.10 mg/LAug 2025400 served Westcreek Lakes WdNatural background0.70 mg/LMar 2025165 served Western Extension Domestic Water Companypurchased waterNatural background0.38 mg/LJun 202537 served Western Hills Mhppurchased waterNatural background0.10 mg/LFeb 2026213 served Western Inn MhpNatural background0.50 mg/LMar 202672 served Westlake Mhppurchased waterNatural background0.06 mg/LSep 2025116 served City of WestminsterNatural background0.05 mg/LMay 2025202,078 served Westside MhpNatural background0.01 mg/LOct 2025236 served Westwinds WdNatural background0.40 mg/LJan 202563 served Westwood Lakes WdHuman impact likely2.00 mg/LApr 2026450 served Wheat Ridge Water Districtpurchased waterNatural background0.08 mg/LMar 202620,000 served White Haven MhpHuman impact likely2.10 mg/LMay 202556 served White Horse Springs WdNatural background0.40 mg/LMar 202670 served Wide Acres Mhppurchased waterNatural background0.10 mg/LMay 202696 served Widefield WsdHealth-study range7.40 mg/LJul 202527,640 served Town of WigginsNatural background0.30 mg/LFeb 20261,909 served Wigwam Mutual WcHuman impact likely2.80 mg/LFeb 20251,300 served Wikiup MhpNatural background0.05 mg/LFeb 20262,500 served Wildcat RanchNatural background0.31 mg/LMay 202633 served Town of WileyNatural background0.05 mg/LJun 2025405 served Will O Wisp Metro DistrictNatural background0.80 mg/LFeb 2026300 served Williams Creek Waterpurchased waterNatural background0.50 mg/LApr 202660 served Town of Williamsburgpurchased waterNatural background0.01 mg/LFeb 2025775 served Willow Brook Metro DistrictNatural background0.30 mg/LJan 2026120 served Willowbrook Wsdpurchased waterNatural background0.08 mg/LMar 20269,348 served Willows Wdpurchased waterNatural background0.08 mg/LMar 202619,000 served Wilson MesaNatural background0.20 mg/LDec 2025290 served Windcliff Poapurchased waterNatural background0.15 mg/LFeb 2026337 served Town of Windsorpurchased waterNatural background0.05 mg/LMar 202623,500 served Winter Park Ranch WsdNatural background0.30 mg/LAug 20253,250 served Winter Park WsdNatural background0.10 mg/LJan 20266,635 served Wise Projectpurchased waterNatural background0.41 mg/LMay 20260 served Wj Metro DistrictHuman impact clear3.70 mg/LNov 2025324 served Wooden Deer HoaHuman impact likely2.70 mg/LMay 202538 served Woodland Hills Mhcpurchased waterHuman impact likely1.02 mg/LSep 20251,740 served City of Woodland ParkHuman impact likely1.60 mg/LJan 20268,500 served Woodland West WuaHuman impact likely2.90 mg/LJan 2026250 served Woodlands Eastpurchased waterNatural background0.05 mg/LFeb 2026350 served Woodmen Hills MdNatural background0.40 mg/LNov 202513,888 served Woodmoor WsdNatural background0.05 mg/LApr 202618,031 served Woodshire East Mobile Home Park Ltdpurchased waterNatural background0.41 mg/LMay 2026751 served Woody Creek Metropolitan DistrictNatural background0.30 mg/LMar 2025220 served City of WrayHuman impact likely2.10 mg/LSep 20252,342 served

Y

Town of YampaNatural background0.12 mg/LApr 2026467 served Ymca Snow Mtn RanchNatural background0.60 mg/LAug 2025578 served City of YumaHuman impact clear4.10 mg/LMay 20254,049 served

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NitrateSmart

Nitrate in community water systems, from the utilities’ own compliance reporting.

Results reaching back to July 2023 · current through August 9, 2026.

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