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Oregon system directory

Find a community water system

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

932

systems with a current result

3,747,065

people served by them

81

systems carrying a supplier result

25

systems at or above 5 mg/L

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.

Showing 932 of 932 systems

0-9

62Nd Court Mutual Water CoNatural background0.10 mg/LDec 202550 served

A

A River Runs ThroughHealth-study range6.00 mg/LMay 202630 served Adair Village Water SystemNatural background0.21 mg/LDec 2025875 served City of Adams Water DeptNatural background0.50 mg/LFeb 2026400 served City of AdrianHealth-study range6.21 mg/LDec 2024159 served Agate Water SystemNatural background0.11 mg/LOct 20253,153 served City of AlbanyNatural background0.18 mg/LJun 202657,997 served Albany Trailer And Rv Park, LlcHuman impact clear4.11 mg/LMay 2025130 served Alder Creek Barlow Water Distpurchased waterNatural background0.18 mg/LFeb 2026300 served Alderwood Water Dev CoNatural background0.13 mg/LFeb 202534 served Aldridge Ditch Co Wspurchased waterNatural background0.03 mg/LJun 202588 served Alpine Crest Improvement DistNatural background0.10 mg/LAug 202591 served Alsea County Service DistrictNatural background0.50 mg/LJul 2025202 served Amigo Villa Water Service IncNatural background0.05 mg/LJun 2026100 served City of AmityNatural background0.26 mg/LJul 20251,810 served Anglers Cove/SchwcNatural background0.10 mg/LSep 202585 served City of AntelopeHuman impact likely1.41 mg/LJan 202646 served Applegate Mobile Park (Lower)Human impact clear3.12 mg/LMar 202526 served Applegate Trail Rv ParkNatural background0.31 mg/LDec 202532 served Applewood Mobile Home ParkHuman impact likely1.17 mg/LMay 2026125 served Arch Cape Water DistrictNatural background0.27 mg/LApr 2025200 served Arlington City Water SupplyNatural background0.50 mg/LNov 2025628 served Arneys Forest View MhpNatural background0.05 mg/LAug 202550 served Arrowhead Mobile Home ParkHuman impact clear3.75 mg/LApr 2025220 served Arrowood Community Water CoNatural background0.50 mg/LJan 2026170 served Ashdown Wood Water CompanyNatural background0.05 mg/LJun 202675 served Ashland Acres Mobile EstatesHuman impact likely2.09 mg/LSep 202530 served Ashland Country EstatesHuman impact likely1.27 mg/LFeb 202585 served Ashland Valley InnHuman impact likely1.59 mg/LFeb 202559 served Ashland Water DepartmentNatural background0.10 mg/LJul 202520,946 served Aspen Lakes Utility Co LlcNatural background0.35 mg/LMar 2026150 served City of AstoriaNatural background0.46 mg/LMar 202610,181 served City of AthenaHuman impact clear4.01 mg/LNov 20251,238 served City of AumsvilleNatural background0.25 mg/LJun 20254,125 served City of AuroraNatural background0.10 mg/LNov 20251,133 served Aurora Acres Rv ResortNatural background0.42 mg/LAug 2025450 served Avion Wc - Brasada RanchHuman impact likely1.20 mg/LMay 20261,200 served Avion Wc - ChaparralHuman impact likely1.13 mg/LJun 2025470 served Avion Wc - Cinder Butte EstsHuman impact likely1.80 mg/LMay 2026120 served Avion Wc - Desert SpringsNatural background0.23 mg/LMar 2026130 served Avion Wc - DridHuman impact likely1.30 mg/LFeb 202660 served Avion Wc - Greater AvionNatural background0.09 mg/LMar 202635,332 served Avion Wc - Highland EstatesHuman impact likely1.57 mg/LJun 202575 served Avion Wc - Odin Falls RanchNatural background0.82 mg/LSep 2025120 served Avion Wc - Red CloudHuman impact likely1.00 mg/LAug 2025585 served Avion Wc - South Redmond HeightsHuman impact likely1.06 mg/LJan 2025190 served Avion Wc - Sun Country Wtr SaddlebackNatural background0.07 mg/LJun 2025300 served Avion Wc - Tetherow CrossingHuman impact likely1.50 mg/LFeb 2026180 served Avion Wc - Tumalo RimHuman impact likely1.00 mg/LMar 2026225 served Avion Wc - TurnerNatural background0.07 mg/LJul 202535 served Avion Wc - TuscaroraNatural background0.15 mg/LFeb 2026120 served Avion Wc - Whychus CreekNatural background0.31 mg/LSep 2025428 served Avion Wc - Wild RiverNatural background0.12 mg/LMay 2025276 served Avion Wc-KlippelNatural background0.07 mg/LMar 202680 served

B

Baker CityNatural background0.15 mg/LFeb 202610,349 served City of BandonNatural background0.10 mg/LAug 20253,000 served Bandon Coastal DunesNatural background0.10 mg/LJul 2025225 served Banks Water DepartmentNatural background0.22 mg/LJan 20262,070 served City of BarlowHuman impact likely1.80 mg/LDec 2025135 served Barlow Trail EstatesNatural background0.06 mg/LJun 2026180 served Barlow Water DistrictNatural background0.50 mg/LApr 2025900 served Barnes Butte HoaHuman impact likely2.45 mg/LJan 2026148 served Bay Aire Mobile Home ParkNatural background0.89 mg/LAug 202582 served Bay City Water SystemNatural background0.57 mg/LSep 20251,400 served Bay Hills Water AssociationHuman impact likely1.11 mg/LJun 202645 served Bear Creek Mobile Home ParkHuman impact clear4.25 mg/LJul 202595 served Beaver Water DistrictHuman impact likely1.38 mg/LMay 2026600 served City of BeavertonNatural background0.22 mg/LApr 202688,045 served Bella Casa ParkHuman impact clear4.49 mg/LAug 2025125 served Belle Passi EstatesNatural background0.00 mg/LJan 202630 served City of BendNatural background0.50 mg/LAug 202577,704 served Bentwood Estates Water SystemHuman impact likely1.30 mg/LSep 202580 served Berndt Creek Water CorpNatural background0.02 mg/LOct 202545 served Bethel ParkNatural background0.00 mg/LJun 2026125 served Beverly Beach Water DistrictNatural background0.51 mg/LMar 2026152 served Big Foot MhpHuman impact likely1.01 mg/LJun 202560 served Big Oak MarinaNatural background0.06 mg/LNov 202530 served Big Spruce Mhp LlcNatural background0.05 mg/LJan 202680 served Big Valley Woods Water CorpNatural background0.28 mg/LMar 2026550 served Bigfoot AcresHuman impact likely1.23 mg/LMay 202660 served Black Butte Ranch CorporationNatural background0.08 mg/LJun 2026740 served Black Mountain Water DistrictNatural background0.50 mg/LApr 202643 served Blue Moon Mobile Home ParkHuman impact likely1.65 mg/LSep 202570 served Blue River Water DistrictNatural background0.40 mg/LApr 2026150 served Blue Spruce Mobile EstatesHuman impact likely2.79 mg/LMar 202655 served Bly Water DistrictNatural background0.46 mg/LOct 2025310 served City of BoardmanHuman impact clear4.26 mg/LJul 20255,749 served Boring Water District No 24Natural background0.05 mg/LNov 20252,500 served Breitenbush Hot SpringsNatural background0.10 mg/LOct 2025150 served Brewster Community HomeownersHuman impact clear3.80 mg/LOct 202570 served Bridge Water DistrictNatural background0.26 mg/LSep 2025150 served Brightwood Water WorksNatural background0.05 mg/LSep 2025100 served City of BrookingsNatural background0.25 mg/LAug 20257,120 served City of BrownsvilleNatural background0.55 mg/LMar 20251,906 served Buell-Red Prairie WdNatural background0.10 mg/LApr 2026800 served Burlington Water DistrictNatural background0.12 mg/LJan 2025340 served Burns Water DepartmentHuman impact clear3.03 mg/LJul 20252,730 served Burnside Water Associationpurchased waterNatural background0.46 mg/LMar 2026350 served Town of Butte FallsNatural background0.10 mg/LJul 2025443 served

C

Camelot Mobile Home ParkNatural background0.10 mg/LNov 2025150 served Camp BradleyNatural background0.10 mg/LOct 202570 served Canby RegencyHealth-study range8.19 mg/LJun 2026265 served Canby UtilityNatural background0.62 mg/LJan 202518,754 served City of Cannon BeachNatural background0.47 mg/LDec 20251,710 served Canyon City Water DepartmentHuman impact likely2.55 mg/LJan 2026666 served Canyon Ridgepurchased waterNatural background0.53 mg/LSep 2025153 served City of CanyonvilleNatural background0.10 mg/LDec 20251,662 served City of CarltonNatural background0.03 mg/LAug 20252,270 served Carmel Beach Water DistrictNatural background0.05 mg/LApr 202639 served Carolina Water SystemNatural background0.10 mg/LFeb 2025300 served Carver Mobile RanchNatural background0.05 mg/LJun 2026110 served Cascade Gorge PropertiesNatural background0.10 mg/LJan 202533 served City of Cascade LocksNatural background0.41 mg/LNov 20251,398 served Cascade View EstatesNatural background0.50 mg/LNov 2025113 served Cascadia Mobile ParkNatural background0.05 mg/LMar 202660 served Caseys Riverside ParkNatural background0.05 mg/LMay 202690 served City of Cave JunctionNatural background0.25 mg/LAug 20252,160 served Caveman Mobile Home ParkHuman impact likely1.40 mg/LJan 202645 served Cedar Tree Mobile Home ParkNatural background0.05 mg/LJun 202650 served Cedarhurst Improvement ClubNatural background0.05 mg/LMay 202660 served City of Central Pointpurchased waterNatural background0.10 mg/LAug 202519,785 served Century Farm CourtHuman impact likely1.81 mg/LJul 202542 served Century Meadows IncNatural background0.02 mg/LNov 2025480 served Chaparral Mobile RanchNatural background0.04 mg/LJun 2026110 served Charles Tracts Water CompanyNatural background0.12 mg/LDec 2025290 served Chart SubdivisionHuman impact clear4.26 mg/LOct 2025125 served Chateau Mobile Home ParkNatural background0.03 mg/LJan 2026136 served Chehalem Mtn Sun Ridge Water CoHuman impact likely1.17 mg/LMay 202570 served Chehalem Terrace Water CompanyNatural background0.05 mg/LApr 202530 served Chehalem Valley Water Assnpurchased waterNatural background0.25 mg/LSep 202575 served Chenowith PudHuman impact likely2.18 mg/LMay 20264,500 served Chiloquin Municipal Water DeptNatural background0.10 mg/LSep 2025730 served Christmas Valley Domestic WsNatural background0.00 mg/LNov 2025950 served Cimmarron City Water SystemNatural background0.25 mg/LDec 2025450 served Circle C Improvement DistrictHuman impact likely1.50 mg/LJun 2026150 served Circle Tree Mobile Park/RanchHuman impact likely1.34 mg/LJan 202657 served Clackamas River Rv ParkNatural background0.13 mg/LNov 2025100 served Clackamas River WaterNatural background0.12 mg/LJan 202629,918 served Clackamas River Water - ClairmontNatural background0.18 mg/LJan 202619,928 served Clarks Branch Water AssocNatural background0.05 mg/LAug 2025140 served City of ClatskanieNatural background0.25 mg/LJun 20262,188 served Clayton Creek Mh EstatesNatural background0.10 mg/LNov 2025165 served Cline Falls Mobile Home ParkHuman impact likely1.40 mg/LOct 202585 served Cline Falls Oasis Imprv DistHuman impact likely1.40 mg/LApr 202680 served Clovercrest Community Water SystemHuman impact clear3.06 mg/LOct 202565 served Cloverdale Water DistrictHuman impact likely1.85 mg/LJul 2025310 served City of CoburgHuman impact clear3.94 mg/LAug 20251,195 served College Mobile Home ParkHuman impact likely1.03 mg/LJan 202634 served Collier Lane HoaNatural background0.24 mg/LNov 202460 served Colorado Lake CoopHealth-study range8.29 mg/LApr 202680 served Colton Water DistrictNatural background0.15 mg/LNov 20251,500 served Columbia Acres Water AssocHuman impact clear4.31 mg/LFeb 2026110 served Columbia City Mun WaterworksHuman impact clear3.16 mg/LNov 20251,995 served Columbia Hills HoaNatural background0.05 mg/LJul 202584 served City of CondonHuman impact clear3.95 mg/LJan 2026742 served Condon Heights WsHuman impact likely1.54 mg/LMay 202533 served Coos Bay North Bend Wtr BrdNatural background0.35 mg/LMar 202634,500 served City of CoquilleNatural background0.10 mg/LMay 20263,953 served Corbett Water DistrictNatural background0.02 mg/LApr 20262,954 served City of CorneliusNatural background0.03 mg/LMay 202614,490 served City of CorvallisNatural background0.05 mg/LAug 202561,468 served City of Cottage GroveHuman impact likely1.11 mg/LApr 202610,879 served Country Club Estates WdNatural background0.22 mg/LSep 202545 served Country Club Water DistrictNatural background0.05 mg/LSep 2025150 served Country Estates Mobile ParkNatural background0.62 mg/LJan 2026175 served Country Garden Estates MhpHealth-study range7.68 mg/LJun 2026175 served Country Squire EstatesNatural background0.50 mg/LApr 2025150 served Country View Estates WsNatural background0.05 mg/LDec 2025104 served Country View Mh EstatesNatural background0.10 mg/LNov 2025132 served Country View MhpNatural background0.25 mg/LJan 202680 served Country Villa Mobile EstatesHuman impact likely2.20 mg/LNov 202590 served Country Village Mobile EstatesHuman impact likely1.49 mg/LJul 202580 served City of CoveNatural background0.50 mg/LJan 2026550 served Cove Orchard Water Associationpurchased waterNatural background0.26 mg/LApr 2026300 served Cove PartnershipHuman impact likely1.58 mg/LDec 202540 served Covered Bridge MhpHuman impact likely1.18 mg/LMar 202536 served Crescent Wtr Supply & Impr DistNatural background0.06 mg/LSep 2025900 served City of CreswellNatural background0.17 mg/LJan 20255,585 served Crooked River Ranch Wtr CoNatural background0.30 mg/LJun 20264,000 served Crossroads Mobile Home ParkNatural background0.10 mg/LNov 2025150 served Crown Mobile Home ParkNatural background0.15 mg/LJan 202642 served Crystal Springs Water DistrictHealth-study range6.70 mg/LApr 20265,973 served Cswa Chehalem SpringsHuman impact likely1.97 mg/LFeb 2026130 served Cswa Oliver SpringHuman impact likely1.75 mg/LFeb 202640 served Currinsville Mobile Home ParkNatural background0.19 mg/LMay 202690 served Cypress Grove Rv ParkHuman impact likely2.47 mg/LMay 202572 served

D

City of DallasNatural background0.09 mg/LFeb 202617,911 served Dark Hollow Water AssociationNatural background0.10 mg/LMar 202645 served Darneille EstatesHuman impact likely1.14 mg/LJan 202647 served City of DaytonNatural background0.79 mg/LApr 20252,535 served City of DayvilleHuman impact likely2.26 mg/LJan 2026155 served Dean Minard Water Districtpurchased waterNatural background0.10 mg/LMay 202675 served Deception Creek Mobile ParkNatural background0.12 mg/LMay 202640 served Deer Creek EstatesNatural background0.07 mg/LNov 2025350 served Deer Island Heights WsNatural background0.36 mg/LAug 202560 served Deer Island Village MhpHuman impact clear3.60 mg/LApr 2026100 served Deer Island WaterworksHuman impact likely2.78 mg/LJan 202690 served Deer Trail Water SystemNatural background0.50 mg/LJan 202645 served Deer View CooperativeNatural background0.24 mg/LMay 202690 served Deerhorn Community Wtr AssnNatural background0.50 mg/LJun 2025275 served Delphian SchoolNatural background0.00 mg/LDec 2025350 served City of Depoe BayNatural background0.51 mg/LMar 20261,398 served Deschutes Mobile ParkNatural background0.50 mg/LJan 202662 served Deschutes Valley Water DistNatural background0.17 mg/LAug 202511,700 served Desert Meadows Hoapurchased waterNatural background0.53 mg/LSep 2025150 served Desert Mobile Home EstatesHuman impact clear4.74 mg/LFeb 2026100 served Desert Terrace Mobile EstatesNatural background0.50 mg/LJan 2026100 served Desire For Healing, IncHuman impact clear3.15 mg/LNov 202533 served Detroit Water SystemNatural background0.50 mg/LJan 2026100 served Dexter Oaks Co-OpNatural background0.23 mg/LApr 202575 served Dexter Shores Mobile Home ParkNatural background0.42 mg/LMay 2026120 served Diamond Hill Rv ParkHuman impact likely2.36 mg/LJun 2025203 served Diamond Lake Lodge/ResortNatural background0.23 mg/LJan 202690 served Diamond Ridge Water AssociationNatural background0.05 mg/LMay 202554 served Dietz Air Park Water SystemNatural background0.13 mg/LNov 202585 served Dikeside MoorageNatural background0.05 mg/LFeb 202645 served City of DonaldNatural background0.08 mg/LJun 20261,107 served City of DrainNatural background0.05 mg/LJul 20251,194 served Drifters Mobile Home ParkHuman impact likely2.00 mg/LJan 202580 served Dry Canyonpurchased waterNatural background0.53 mg/LSep 2025160 served Dry Creek AirparkHuman impact likely2.48 mg/LJan 202658 served City of DufurNatural background0.05 mg/LOct 2025610 served Dufur, South BasinNatural background0.50 mg/LOct 202533 served City of DundeeHuman impact likely1.25 mg/LMay 20252,960 served Dunn Court DuplexesNatural background0.01 mg/LJun 202688 served Duplex Village EastNatural background0.10 mg/LSep 202541 served Duplex Village Water SystemNatural background0.10 mg/LApr 2025165 served

E

Eagle Creek Mobile EstatesNatural background0.03 mg/LDec 202435 served Eagle Crest Mobile Home ParkNatural background0.03 mg/LJan 2026300 served Eagle Crest ResortHealth-study range5.10 mg/LSep 2025400 served City of Eagle Pointpurchased waterNatural background0.10 mg/LAug 20259,554 served Eagle Valley Rv ParkNatural background0.05 mg/LOct 202570 served East Yamhill Rural Wdpurchased waterNatural background0.25 mg/LSep 202590 served Eastmont Water CompanyNatural background0.14 mg/LJul 2025250 served City of EchoNatural background0.50 mg/LOct 2025632 served Eden Park HomeownersNatural background0.22 mg/LApr 202560 served Elderberry Nehalem WsHuman impact likely1.54 mg/LOct 2024160 served Elgin Water DepartmentNatural background0.05 mg/LDec 20251,717 served Elk City Water Districtpurchased waterNatural background0.10 mg/LAug 2025600 served Elk River CampgroundNatural background0.83 mg/LApr 202664 served City of ElktonNatural background0.05 mg/LSep 2025187 served Emerald Valley Mh & Rv ParkNatural background0.21 mg/LFeb 202531 served City of EnterpriseNatural background0.50 mg/LJan 20262,107 served City of EstacadaNatural background0.03 mg/LFeb 20255,750 served Estacada Mobile VillageNatural background0.10 mg/LSep 2025150 served Eugene Mobile VillageNatural background0.05 mg/LMay 2026260 served Eugene Water & Electric BoardNatural background0.03 mg/LMay 2026176,000 served Evergreen Meadows Wtr Improv DistNatural background0.42 mg/LNov 202570 served Excalibur VillageNatural background0.25 mg/LJun 2026180 served

F

City of FairviewHuman impact likely1.28 mg/LOct 20259,963 served Fairview Water DistrictHuman impact clear3.00 mg/LApr 20261,920 served Falcon Cove Beach WdNatural background0.53 mg/LSep 2025215 served Falcon HeightsNatural background0.12 mg/LApr 2026559 served Fall Creek Water DistrictNatural background0.50 mg/LJul 202540 served City of Falls CityNatural background0.16 mg/LMar 20251,051 served Family Redwood Park CooperativeHuman impact likely2.25 mg/LSep 2025250 served Fern Ridge ShoresNatural background0.05 mg/LFeb 2025275 served Fern Valley Estates Impr DistHuman impact likely1.34 mg/LNov 2025135 served Fernhill Community Wtr Systempurchased waterNatural background0.46 mg/LMar 2026300 served Fernridge Mobile EstatesHuman impact likely2.64 mg/LApr 2026250 served Fir Grove Homeowners Assnpurchased waterNatural background0.26 mg/LApr 2026450 served Fir Grove Mobile CourtHealth-study range6.00 mg/LSep 2025114 served Fir View Water CompanyNatural background0.10 mg/LApr 2025150 served Fischers Place MhpHealth-study range9.87 mg/LMay 2026130 served Fishhawk Lake Reserve And CommunityNatural background0.05 mg/LJun 2025350 served City of FlorenceNatural background0.05 mg/LDec 20259,561 served Flying K Trailer RanchHuman impact likely1.95 mg/LJan 202696 served Foley Lakes Mobile Home ParkNatural background0.50 mg/LJun 2026300 served City of Forest GroveNatural background0.12 mg/LMay 202626,838 served Forest Haven SubdivisionHuman impact likely1.25 mg/LMay 2026165 served Forest Park Mobile VillageNatural background0.10 mg/LJun 202675 served Fortune Branch Village MhpNatural background0.12 mg/LMay 202680 served City of FossilHuman impact likely1.74 mg/LJan 2026470 served Four Seasons MhpNatural background0.39 mg/LMay 2025100 served Fox Hollow Estates Water CorpNatural background0.97 mg/LJun 202626 served Fox Ridge Water CoNatural background0.10 mg/LAug 202560 served Fruitdale Heights Water CoHuman impact likely2.67 mg/LAug 202570 served Fruitdale Trailer ParkHuman impact likely2.62 mg/LJan 202650 served

G

Galice Subdivision Water CoNatural background0.25 mg/LAug 202533 served Garden Valley Water AssociationNatural background0.91 mg/LDec 202584 served Garibaldi Water SystemNatural background0.83 mg/LMay 2026837 served City of Gastonpurchased waterNatural background0.26 mg/LApr 2026625 served City of GatesNatural background0.50 mg/LJan 2026220 served Gearhart Water DepartmentNatural background0.05 mg/LApr 20261,780 served Gervais Water DepartmentNatural background0.10 mg/LAug 20252,571 served Gh2O IncHuman impact likely2.58 mg/LMay 2026120 served Gilchrist Water System LlcNatural background0.15 mg/LOct 2025440 served City of Gladstonepurchased waterNatural background0.10 mg/LJan 202612,121 served City of GlendaleNatural background0.10 mg/LAug 2025864 served Glenmorrie Cooperative AssnNatural background0.20 mg/LJul 2025300 served Glide Water AssociationNatural background0.05 mg/LAug 20251,523 served Gnr Water Districtpurchased waterNatural background0.11 mg/LJul 202560 served Goble Water AssociationHuman impact likely1.76 mg/LJul 202585 served City of Gold BeachNatural background0.10 mg/LApr 20253,000 served City of Gold HillNatural background0.10 mg/LMay 20261,335 served Gold Hill Mobile Home ParkHuman impact clear3.12 mg/LJan 202676 served Golf MhpAbove the federal limit13.90 mg/LJun 202660 served Government Camp Water SystemNatural background0.06 mg/LJul 2025200 served Grand Prairie Water Supply CoNatural background0.01 mg/LApr 2026110 served Grand Ronde Community Wtr AssnNatural background0.26 mg/LMay 20262,500 served Grandview Mobile Home ParkNatural background0.05 mg/LFeb 202599 served City of Grants PassNatural background0.33 mg/LOct 202537,138 served Grants Pass Mobile Home Park LlcNatural background0.25 mg/LJan 2026140 served Grass Valley Water SystemHuman impact likely2.12 mg/LJan 2026184 served Green AcresNatural background0.06 mg/LNov 202597 served Green Acres Mhp - Umatilla CoNatural background0.50 mg/LFeb 2026200 served Green Acres Rv ParkNatural background0.83 mg/LFeb 2026135 served Green Area Water & Sanitary AuthorityNatural background0.05 mg/LNov 20257,000 served Green Meadows Wtr CorporationHuman impact likely1.19 mg/LDec 202575 served Green Oaks Park LlcNatural background0.10 mg/LMar 2025165 served City of Greshampurchased waterNatural background0.02 mg/LMar 202673,932 served Grim EstatesNatural background0.25 mg/LMar 202640 served Guptil SubdivisionNatural background0.49 mg/LSep 202579 served

H

Hafez Water SystemNatural background0.05 mg/LAug 202578 served City of HainesNatural background0.30 mg/LOct 2025395 served Halcyon Villa Mobile Home ParkHealth-study range7.12 mg/LJan 2026126 served City of HalfwayNatural background0.15 mg/LApr 2025346 served Halls Trailer CourtHuman impact likely1.56 mg/LFeb 202660 served City of HalseyHuman impact clear4.76 mg/LNov 2025800 served Happy Hollow Water CompanyHuman impact clear4.98 mg/LNov 202540 served Harbor Water PudNatural background0.18 mg/LAug 20253,150 served Harmony Acres Mobile ParkNatural background0.00 mg/LApr 202531 served City of HarrisburgNatural background0.05 mg/LNov 20253,684 served Harwoods Mobile ManorHealth-study range8.37 mg/LJan 202665 served Hat Rock Mobile CourtNatural background0.05 mg/LJun 202560 served Hat Rock Water CompanyHuman impact likely1.92 mg/LMay 2026150 served Hawks PointNatural background0.05 mg/LJan 202675 served Hazel Dell OrchardHuman impact clear3.44 mg/LJun 2026260 served Hebo Joint Water & Sanitary AuthHuman impact likely1.09 mg/LAug 2025250 served Heceta Water Peoples Utility DistrictNatural background0.05 mg/LMay 20264,921 served City of HelixNatural background0.50 mg/LAug 2025190 served City of HeppnerNatural background0.50 mg/LDec 20251,187 served Heritage Hills Homeowners AssnNatural background0.10 mg/LMay 202634 served Heritage Improvement DistrictNatural background0.50 mg/LJul 2025125 served City of HermistonNatural background0.50 mg/LApr 202620,000 served Hidden Meadows SubdivisionNatural background0.13 mg/LJul 202540 served Hidden Meadows Water Assn IncNatural background0.38 mg/LApr 2025110 served Hidden Valley Mbl Ests Imp DisHuman impact likely1.20 mg/LSep 2025240 served Hideaway Hills Water Companypurchased waterNatural background0.11 mg/LJul 202545 served High Desert EstatesHuman impact likely1.40 mg/LJan 2026380 served High Prairie Villa Wtr SystemNatural background0.05 mg/LJun 202549 served Highland Heights EstatesNatural background0.25 mg/LJul 202560 served Highland Ranch EstatesHuman impact likely2.09 mg/LMay 202560 served Highland Subdivision WdHuman impact likely1.83 mg/LApr 2026335 served Highland View Mobile Home ParkHuman impact likely1.00 mg/LMay 202660 served Hiland Wc - Bear CreekNatural background0.26 mg/LApr 2025275 served Hiland Wc - Boulder CreekNatural background0.44 mg/LJan 2026350 served Hiland Wc - Echo MountainNatural background0.05 mg/LJan 2026362 served Hiland Wc - Fryer HillNatural background0.18 mg/LJan 202632 served Hiland Wc - HeltonHuman impact clear4.52 mg/LJan 202675 served Hiland Wc - Heritage Water CompanyNatural background0.05 mg/LJan 202655 served Hiland Wc - HillviewNatural background0.05 mg/LJan 202638 served Hiland Wc - Illahe Golf Club EstatesHuman impact likely1.80 mg/LJan 2026561 served Hiland Wc - LombardNatural background0.05 mg/LJan 2026300 served Hiland Wc - Penticton/College ParkNatural background0.25 mg/LJun 2025710 served Hiland Wc - RiverbendNatural background0.64 mg/LJan 2026172 served Hiland Wc - Shadow WoodNatural background0.25 mg/LFeb 2026175 served Hiland Wc - Shady CoveNatural background0.10 mg/LOct 20251,000 served Hiland Wc - StablesNatural background0.21 mg/LJan 202620 served Hiland Wc - WestwoodNatural background0.39 mg/LMay 2026200 served Hiland Wc - WildernessNatural background0.25 mg/LJan 202620 served Hiland Wc - WylandNatural background0.18 mg/LJan 202625 served City of Hillsboropurchased waterNatural background0.26 mg/LApr 202692,632 served Hillsboro-Cherry GroveNatural background0.04 mg/LApr 20261,628 served Hilltop Improvement DistrictHuman impact likely1.46 mg/LMar 202645 served Hines Water DepartmentHuman impact likely1.85 mg/LMar 20251,645 served Hogg Heaven MhpHuman impact likely2.35 mg/LApr 202640 served Holiday Mobile Home ParkHuman impact clear3.10 mg/LJan 202658 served City of Hood RiverNatural background0.03 mg/LJun 20258,577 served Hoodview Mobile EstatesNatural background0.10 mg/LJul 2025100 served Hope Valley ResortNatural background0.71 mg/LApr 2025200 served Hopewell Water CompanyHuman impact likely2.05 mg/LNov 2025100 served Horizon Village Community Water SystemNatural background0.25 mg/LApr 202680 served City of HubbardNatural background0.40 mg/LJan 20263,478 served Hunnell Hills Water SystemNatural background0.63 mg/LJul 202545 served Hunt Water Districtpurchased waterHuman impact likely2.11 mg/LSep 202560 served City of HuntingtonHuman impact likely1.95 mg/LMay 2026510 served

I

Ice Fountain Water DistrictNatural background0.03 mg/LJan 20256,000 served Idaho Power-Oxbow VillageNatural background0.15 mg/LAug 202575 served Idanha City WaterNatural background0.50 mg/LJan 2026168 served Idleway Improvement DistrictHuman impact likely2.18 mg/LOct 2025183 served City of ImblerHuman impact likely2.04 mg/LJan 2026250 served Independence Water SystemHuman impact clear3.77 mg/LMay 202610,300 served Indian Meadow Water CompanyNatural background0.39 mg/LJun 2026500 served Inn At Otter Crestpurchased waterNatural background0.11 mg/LOct 202590 served Interlachen Water PudHuman impact likely1.66 mg/LSep 2025360 served City of IoneNatural background0.50 mg/LNov 2025330 served City of IrrigonHuman impact likely1.78 mg/LJan 20262,133 served Island CityNatural background0.15 mg/LSep 20251,166 served

J

J & M Mobile Home ParkNatural background0.25 mg/LJan 202545 served Jackson Creek Water AssociationNatural background0.50 mg/LJun 202539 served Jackson WellspringsNatural background0.10 mg/LNov 2025100 served City of Jacksonvillepurchased waterNatural background0.10 mg/LAug 20253,012 served City of JeffersonNatural background0.30 mg/LMar 20263,348 served Jefferson Mobile AcresHuman impact clear4.04 mg/LDec 202565 served City of John DayNatural background0.50 mg/LJan 20261,617 served John Day Water Districtpurchased waterNatural background0.46 mg/LMar 2026350 served Johnson Creek Water ServiceNatural background0.11 mg/LOct 20250 served Joint Water CommissionNatural background0.26 mg/LApr 20260 served City of Jordan ValleyNatural background0.30 mg/LJan 2026175 served City of JosephHuman impact likely2.66 mg/LMay 20261,182 served Junction City Water UtilitiesNatural background0.50 mg/LJun 20257,000 served Juniper Mobile ParkNatural background0.50 mg/LApr 2026175 served Junipine AcresNatural background0.50 mg/LFeb 202670 served Juno Nonprofit Water Improvement Distrpurchased waterNatural background0.57 mg/LSep 2025255 served

K

Keiths Mobile Home ParkNatural background0.71 mg/LJan 202655 served City of KeizerHealth-study range7.84 mg/LJan 202638,585 served Kelso Water AssnNatural background0.21 mg/LApr 2026300 served Keno Water Co IncNatural background0.12 mg/LApr 2026290 served Kerby Water Districtpurchased waterNatural background0.25 mg/LAug 2025400 served Kernville-Gleneden-Linc Bch WdNatural background0.05 mg/LMay 20265,609 served Kilchis Water DistrictHuman impact likely1.27 mg/LAug 2025500 served King Silver Rv ParkNatural background0.31 mg/LDec 202562 served Kingswood Heights Water Co-OpNatural background0.06 mg/LApr 2026138 served Klamath Co Project HomefrontNatural background0.33 mg/LOct 202537 served Klamath Falls Water DeptHuman impact likely1.09 mg/LOct 202540,475 served Knappa Water AssociationNatural background0.35 mg/LOct 20251,800 served Knoll Terrace ParkNatural background0.04 mg/LMar 2025452 served Knoll Terrace Subdivisionpurchased waterNatural background0.10 mg/LDec 2025221 served Kountry VillageNatural background0.05 mg/LFeb 202560 served Kozy Acres Water SystemNatural background0.05 mg/LApr 202640 served

L

La Casa MiaHuman impact likely2.50 mg/LNov 2025135 served City of La GrandeNatural background0.77 mg/LApr 202613,460 served City of La PineNatural background0.07 mg/LJun 20252,807 served La Water Co-Oppurchased waterNatural background0.26 mg/LApr 20262,500 served Labish Village Wtr CommissionHuman impact clear4.69 mg/LJun 2026452 served City of LafayetteHuman impact clear3.00 mg/LApr 20264,423 served Laidlaw Water DistrictNatural background0.56 mg/LAug 2025740 served Lake Creek Ranch MhcHuman impact likely1.19 mg/LApr 2026300 served Lake Grove Water Districtpurchased waterNatural background0.11 mg/LJul 20253,100 served Lake Oswego - Tigard Water SupplyNatural background0.05 mg/LJun 20250 served Lake Oswego Municipal Waterpurchased waterNatural background0.05 mg/LJun 202540,000 served Lakeshore TerraceHuman impact likely1.67 mg/LJul 202560 served Lakeshore Water CompanyNatural background0.05 mg/LFeb 2025135 served Lakeside Mobile Home & Rv ParkHuman impact likely2.06 mg/LDec 2024110 served Lakeside Mobile Home ParkHuman impact likely1.17 mg/LMar 202628 served Lakeside Mobile Home Park (A)Natural background0.42 mg/LMar 202628 served Lakeside Water DistrictNatural background0.20 mg/LJan 20261,800 served City of LakeviewNatural background0.10 mg/LApr 20262,476 served Lakewood HomeownersHuman impact clear3.31 mg/LMay 2025289 served Lakewood Rv ParkNatural background0.74 mg/LMar 202645 served Lamontai Improvement Wtr DistNatural background0.36 mg/LMay 2025255 served Langlois Water DistrictNatural background0.10 mg/LJun 2024220 served Lark Meadows AssociationNatural background0.25 mg/LMar 202680 served Latimer Road Water Associationpurchased waterNatural background0.57 mg/LSep 2025150 served Latourell Falls TownshipNatural background0.99 mg/LSep 202532 served Laurel Acres Water Co IncNatural background0.05 mg/LMar 202650 served Laurel Ridge MhpNatural background0.59 mg/LApr 202670 served Laurelwood Water UsersHuman impact likely1.42 mg/LOct 2025200 served Lawrence Subdivision Wtr AssnHuman impact clear3.15 mg/LJun 2025125 served Lawson Acres Water Associationpurchased waterNatural background0.05 mg/LMay 202675 served Lazy Acres Mobile Home ParkNatural background0.07 mg/LJan 202659 served Lazy Days Mobile Home ParkNatural background0.24 mg/LSep 202552 served City of LebanonNatural background0.14 mg/LJan 202618,945 served Leisure Days Mobile Home ParkNatural background0.10 mg/LFeb 202590 served Leisure Pines Mobile RanchHuman impact likely2.02 mg/LOct 202550 served Town of LexingtonHuman impact likely1.32 mg/LFeb 2026255 served Lgc Meadowlark Manor LlcNatural background0.10 mg/LSep 2025195 served Lgc Western Carriage LlcHuman impact clear4.02 mg/LMar 2026150 served City of Lincoln CityNatural background0.21 mg/LAug 202520,830 served London Water Co-OpNatural background0.05 mg/LSep 202563 served Lone Oak EstatesNatural background0.05 mg/LJun 2026258 served City of Long CreekHuman impact likely1.42 mg/LJan 2026173 served Long Prairie Water Districtpurchased waterHuman impact likely2.11 mg/LSep 20251,052 served Lorna Water DistrictNatural background0.05 mg/LJan 2026212 served Lost Creek Heights Wtr AssocNatural background0.25 mg/LAug 2025100 served City of LostineNatural background0.50 mg/LJun 2026350 served City of LowellNatural background0.05 mg/LOct 20251,264 served Lower Siletz Water Systempurchased waterNatural background0.05 mg/LMay 2026165 served Luckiamute Domestic Water CoopHuman impact likely2.50 mg/LSep 20252,738 served Lunnville Water Districtpurchased waterNatural background0.25 mg/LSep 202532 served Lusted Water Districtpurchased waterNatural background0.11 mg/LJul 20251,200 served Lyons Mehama Water DistrictHuman impact likely1.98 mg/LApr 20261,300 served

M

City of MadrasNatural background0.61 mg/LApr 20253,940 served Madrone Hill Mobile Home ParkHuman impact likely1.88 mg/LJul 2025155 served Malin Municipal WaterNatural background0.12 mg/LOct 2025815 served Manna House ChurchHuman impact clear4.44 mg/LJan 2025300 served City of Manzanitapurchased waterNatural background0.94 mg/LNov 20253,200 served Manzanita Hills SubdivisionNatural background0.10 mg/LNov 202530 served Maple Elsie Water ServiceNatural background0.05 mg/LMar 2026100 served Maple Terrace Mobile Home ParkNatural background0.02 mg/LJan 202570 served Mapleton Water DistrictNatural background0.25 mg/LDec 2025600 served Marcola Water DistrictHuman impact likely2.60 mg/LJul 2025600 served Marshland Water AssociationNatural background0.90 mg/LOct 202570 served City of MaupinHuman impact likely1.69 mg/LMar 2025420 served Mayfair Moorage IncNatural background0.05 mg/LMar 202630 served Mccuddys LandingNatural background0.03 mg/LNov 202570 served Mcdougal Water SystemNatural background0.50 mg/LJan 202660 served Mckay Acres Improvement DistHuman impact likely2.47 mg/LAug 202575 served Mckee Bridge Mobile Home ParkNatural background0.10 mg/LMar 202540 served Mckenzie Palisades Water BoardHuman impact clear4.89 mg/LApr 202650 served Mclain Village Water DeptHuman impact clear3.92 mg/LSep 2025100 served Mcminnville Water & LightNatural background0.02 mg/LAug 202534,515 served Mcnary Oaks Mobile VillaNatural background0.10 mg/LApr 2025150 served Mcnulty Water PudNatural background0.05 mg/LNov 20252,500 served Meadow Creek SubdivisionHuman impact likely1.51 mg/LJan 202660 served Meadow Wood EstatesNatural background0.34 mg/LNov 202560 served Medford Gold Hill KoaHuman impact likely2.29 mg/LApr 2026100 served Medford Water CommissionNatural background0.10 mg/LAug 2025106,068 served Merrill Water DepartmentNatural background0.24 mg/LNov 2025907 served Metolius Meadows Prop OwnersNatural background0.50 mg/LJun 2026285 served Midland Water AssociationNatural background0.83 mg/LSep 2025160 served Mill City Water DepartmentHuman impact likely2.02 mg/LMar 20251,830 served Mill Mar Estates Irrigation AssocNatural background0.10 mg/LSep 202575 served City of Millersburgpurchased waterNatural background0.18 mg/LJun 20262,615 served Milo AcademyNatural background0.11 mg/LJun 2026124 served City of Milton-FreewaterHuman impact likely1.12 mg/LApr 20267,145 served City of MilwaukieHuman impact likely2.93 mg/LNov 202520,946 served Mint Acres Water Co-OpHealth-study range8.32 mg/LApr 202635 served City of MitchellNatural background0.50 mg/LJan 2026138 served Mobile Village Mhp LlcHuman impact likely1.35 mg/LNov 2025100 served Mobilife Water Company IncHuman impact clear3.00 mg/LNov 2025175 served City of MolallaNatural background0.05 mg/LMay 202510,298 served City of MonmouthHealth-study range8.72 mg/LMay 202611,651 served City of MonroeNatural background0.36 mg/LMay 2026723 served City of MonumentNatural background0.50 mg/LJan 2026115 served City of MoroHuman impact clear4.80 mg/LApr 2026350 served City of MosierHuman impact likely1.05 mg/LJan 2026468 served Mossy Brae Water DistrictNatural background0.71 mg/LFeb 2026100 served City of Mount AngelNatural background0.10 mg/LAug 20253,650 served City of Mount VernonHuman impact likely1.02 mg/LMay 2025510 served Mountain Air Water AssocNatural background0.03 mg/LApr 2026170 served Mountain View Co-OpHuman impact likely1.49 mg/LApr 202695 served Mountain View MhpNatural background0.28 mg/LOct 2025104 served Mountain VillageNatural background0.10 mg/LNov 202560 served Mt Angel AbbeyNatural background0.02 mg/LJan 2026150 served Mt Hood Rv VillageNatural background0.03 mg/LApr 2026200 served Mt Shadow MhpNatural background0.70 mg/LOct 202530 served Mt Terrace MhpNatural background0.55 mg/LOct 202560 served Mulino Water DistrictNatural background0.05 mg/LJul 2025700 served City of Myrtle CreekNatural background0.05 mg/LFeb 20263,501 served City of Myrtle PointNatural background0.41 mg/LMar 20262,656 served

N

Nantucket ShoresNatural background0.10 mg/LDec 202525 served Nauvoo Mobile EstatesNatural background0.59 mg/LNov 202585 served Neahkahnie Water DistrictNatural background0.74 mg/LJun 2025600 served City of NehalemNatural background0.71 mg/LApr 20261,700 served Nesika Beach-Ophir WdNatural background0.10 mg/LAug 20251,500 served Neskowin Reg Water DistNatural background0.53 mg/LOct 20251,735 served Nestled In HillsHealth-study range6.16 mg/LJun 202642 served Netarts Water DistrictNatural background0.39 mg/LMar 20261,800 served City of NewbergNatural background0.25 mg/LSep 202525,138 served City of NewportNatural background0.05 mg/LSep 202510,160 served Ni-Lah-Sha Village Hoapurchased waterNatural background0.53 mg/LSep 202570 served North Bayside Estates-NorthNatural background0.52 mg/LNov 202465 served North Bayside Estates-SouthNatural background0.34 mg/LSep 202540 served North Brightwood Improv AssnNatural background0.05 mg/LAug 202550 served North Clackamas County WcNatural background0.10 mg/LJan 20260 served North Corvallis Mhp-Well #1Natural background0.50 mg/LJan 2025100 served North Hill Water CorporationNatural background0.50 mg/LFeb 2026100 served North Plains Water Departmentpurchased waterNatural background0.26 mg/LApr 20263,663 served City of North PowderHuman impact likely1.01 mg/LJan 2026501 served Northwest Newberg Water Assnpurchased waterNatural background0.25 mg/LSep 2025250 served Northwood Water District Incpurchased waterNatural background0.57 mg/LSep 202560 served Norwood PudNatural background0.65 mg/LJan 2026150 served Nps Annie SpringsNatural background0.12 mg/LMar 2026200 served City of NyssaHealth-study range5.00 mg/LAug 20253,285 served

O

Oak Lodge Water Servicespurchased waterNatural background0.10 mg/LJan 202630,000 served Oakdale Trailer ParkHuman impact likely2.06 mg/LMay 202626 served City of OaklandNatural background0.05 mg/LOct 2025954 served City of OakridgeNatural background0.64 mg/LJun 20253,310 served Oakvilla Mobile Home ParkHealth-study range6.57 mg/LMar 2026140 served Oakwood Water System IncHuman impact likely1.94 mg/LApr 202555 served Oceanside Water DistrictNatural background0.40 mg/LMay 2026500 served Oceanside Wd - Cape MearesNatural background0.26 mg/LMay 2026170 served Ochoco Valley Home Improv DistNatural background0.50 mg/LMay 202560 served Ochoco West Wtr & San AuthorityNatural background0.50 mg/LMay 2025400 served Old Church Road EstatesNatural background0.05 mg/LMay 202635 served Old Sheep Ranch Water AssocHuman impact likely1.92 mg/LOct 202556 served Olds Mobile ParkHuman impact clear3.40 mg/LJun 202660 served Olney-Walluski Water Assnpurchased waterNatural background0.46 mg/LMar 2026575 served City of OntarioHuman impact likely1.21 mg/LJul 202514,465 served Or Youth Authority - MaclarenNatural background0.10 mg/LMar 2026750 served Orchard Heights Water AssnNatural background0.10 mg/LJun 2025381 served Orchard Point Mobile HomesHuman impact likely1.13 mg/LFeb 202599 served Oregon Citypurchased waterNatural background0.21 mg/LFeb 202633,940 served Oregon Shores Beach Club IncNatural background0.00 mg/LJul 2024352 served Oregon Shores Recreation ClubNatural background0.10 mg/LSep 2025275 served Oregon Water Utilities - Cline Butte IncNatural background0.41 mg/LApr 20252,526 served Oregon Water Utilities - Mountain LakesNatural background0.10 mg/LJun 2025770 served Oregon Water Utilities - SouthviewNatural background0.10 mg/LSep 2025250 served Oregon Water Utilities-PinecrestNatural background0.10 mg/LSep 202578 served Orient Drive Mobile EstatesHuman impact likely1.42 mg/LSep 202583 served Otter Rock Water DistrictNatural background0.55 mg/LDec 2025175 served Oxberg Water System #1Natural background0.18 mg/LFeb 202690 served

P

Pacific City Joint Water - San AuthNatural background0.36 mg/LAug 20251,000 served City of PaisleyNatural background0.62 mg/LOct 2025245 served Palatine Hill Water Districtpurchased waterNatural background0.11 mg/LJul 20251,500 served Palo Mobile Home ParkNatural background0.20 mg/LNov 202540 served Panther Creek WdNatural background0.39 mg/LSep 2025800 served Paradise Community AssocNatural background0.03 mg/LNov 202575 served Paradise MoorageNatural background0.05 mg/LFeb 202690 served Paradise/Rogue Meadows WsNatural background0.10 mg/LNov 2025165 served Parkdale Water Company IncHuman impact likely1.40 mg/LNov 2025867 served Parkdale Water SystemHuman impact likely1.79 mg/LJan 2026100 served Parrett Mountain View EstatesNatural background0.38 mg/LMar 2026155 served Pass Creek Rv Park LlcNatural background0.05 mg/LJul 202550 served City of PendletonHuman impact clear4.60 mg/LNov 202516,996 served Periwinkle Mobile Home ParkHuman impact clear3.24 mg/LJan 202655 served Perrydale Domestic Wtr AssnNatural background0.10 mg/LJun 20262,655 served Petes Mountain Water CoNatural background0.02 mg/LFeb 2025250 served Philomath Public WorksNatural background0.41 mg/LJan 20264,670 served City of Phoenixpurchased waterNatural background0.10 mg/LAug 20255,900 served City of Pilot RockHuman impact likely2.31 mg/LMar 20251,326 served Pine Grove Water Dist (Klamath)Natural background0.00 mg/LAug 2025180 served Pine Grove Water Dist (Wasco)Natural background0.08 mg/LAug 2025140 served Pine Ridge Water Co LlcNatural background0.79 mg/LJan 202644 served Pinewood Mobile ManorNatural background0.50 mg/LApr 2025130 served Pioneer Mobile Home ParkNatural background0.14 mg/LMay 2025400 served Pioneer Park Co-Op IncNatural background0.84 mg/LSep 202554 served Pioneer Village Water CompanyNatural background0.05 mg/LJun 202680 served Pleasant Home Water Districtpurchased waterNatural background0.11 mg/LJul 20251,510 served Pleasant Valley Water Copurchased waterHuman impact likely2.11 mg/LSep 2025936 served Pleasant View Water Copurchased waterNatural background0.25 mg/LSep 2025120 served Polehn Heights Water AssnNatural background0.10 mg/LNov 2025150 served Ponderosa Pines Water CompanyNatural background0.09 mg/LOct 2025900 served Port of Tillamook Baypurchased waterHuman impact likely2.11 mg/LSep 2025250 served City of Port OrfordNatural background0.10 mg/LJul 20251,200 served Porter Creek Mobile Home ParkNatural background0.16 mg/LSep 202535 served Portland Water BureauNatural background0.11 mg/LJul 2025666,200 served Power City Water Co-OpNatural background0.50 mg/LFeb 202670 served City of PowersNatural background0.10 mg/LAug 2025712 served Pp&L-Clearwater VillageNatural background0.05 mg/LMay 202660 served Pp&L-Toketee VillageNatural background0.05 mg/LFeb 202650 served Prairie CityNatural background0.50 mg/LNov 2025841 served Prairie Crossingpurchased waterNatural background0.53 mg/LSep 202566 served Prairie Winds of Junction City LlcNatural background0.05 mg/LApr 202560 served City of PrescottNatural background0.05 mg/LJan 202670 served City of PrinevilleHuman impact clear4.94 mg/LJul 202511,000 served Prineville Mobile Home ParkHealth-study range5.10 mg/LJun 2026130 served Prospect VillageNatural background0.10 mg/LDec 2025175 served

Q

Quail Valley Park Improv DistNatural background0.50 mg/LJan 2025110 served Quincy Water AssociationNatural background0.05 mg/LJul 2025300 served

R

Rainbow Ends Water SystemNatural background0.05 mg/LFeb 202650 served Rainbow Park MhpNatural background0.05 mg/LApr 202630 served Rainbow Rock Service AssociationNatural background0.56 mg/LMay 202680 served Rainbow Rock Village MhpNatural background0.25 mg/LSep 2025115 served Rainbow Water DistrictHuman impact likely2.40 mg/LJun 20256,300 served City of RainierNatural background0.17 mg/LJul 20251,932 served Raintree EstatesNatural background0.50 mg/LJun 202550 served Raleigh Water Districtpurchased waterNatural background0.11 mg/LJul 20254,500 served Ralph Taylor Trailer CourtNatural background0.10 mg/LApr 202545 served Ranchero Petite Improv DistHuman impact likely2.46 mg/LSep 202540 served Red Hills EstatesNatural background0.05 mg/LJul 202539 served Redmond Water DepartmentNatural background0.53 mg/LSep 202537,566 served Redwood Terrace Assisted LivingNatural background0.25 mg/LJan 202650 served Redwood Water Service IncNatural background0.10 mg/LApr 2025125 served City of ReedsportNatural background0.05 mg/LAug 20254,836 served Rhododendron Wtr AssocNatural background0.10 mg/LJul 2025980 served Rice Hill Rv ParkNatural background0.05 mg/LJul 202550 served Rice Hill West SubdivisionHuman impact likely1.00 mg/LJun 202555 served City of RichlandNatural background0.30 mg/LOct 2025165 served Rickreall Water AssociationHealth-study range7.30 mg/LJun 20261,650 served City of RiddleNatural background0.05 mg/LMay 20261,224 served Ridgewater Water SystemNatural background0.03 mg/LJul 202580 served Ridgewood Dist Improv CoNatural background0.13 mg/LJun 202690 served Rieth Water DistrictHuman impact likely2.74 mg/LDec 2025150 served Rim At Aspen LakesNatural background0.50 mg/LJan 202631 served Rimrock West Imprvmnt DistHuman impact likely1.90 mg/LOct 2025150 served Rink Creek Water Districtpurchased waterNatural background0.10 mg/LMay 2026285 served River Haven Mobile Home EstatesHuman impact clear4.99 mg/LSep 2025140 served River Meadows Improvement DistNatural background0.50 mg/LJun 2026432 served River Village MhpHuman impact likely1.12 mg/LOct 202540 served Riverbend Mobile Home ParkNatural background0.50 mg/LApr 2025600 served Riverbend-Riverbank CommunityNatural background0.25 mg/LFeb 2026225 served Riverfront Rv ParkNatural background0.25 mg/LJan 202665 served Rivergrove Water DistrictHuman impact likely2.90 mg/LAug 20254,000 served Riverside Mobile ParkNatural background0.80 mg/LSep 202532 served Riverside Rv ParkNatural background0.25 mg/LFeb 2025200 served Riverside Water DistrictNatural background0.51 mg/LJul 2025120 served Riverstone Mobile Home ParkNatural background0.75 mg/LJul 2025168 served Riverview Mfgd Home CourtNatural background0.01 mg/LMay 2025400 served Riverview Trailer ParkHuman impact clear4.69 mg/LMar 202660 served Riverwood Mhp Lane CoNatural background0.05 mg/LMar 2025325 served Riviera Mobile ParkHuman impact likely1.17 mg/LMay 2026150 served Roats Water SystemNatural background0.08 mg/LSep 20256,469 served Robbins Nest Residential ParkHuman impact likely1.29 mg/LDec 202527 served Rock Creek Water DistrictNatural background0.27 mg/LApr 2026300 served Rock of Ages Rest HomeNatural background0.36 mg/LJan 202697 served City of Rockaway BeachNatural background0.42 mg/LApr 20261,400 served Rockwood PudNatural background0.02 mg/LMar 202665,443 served Rocky Pointe MarinaNatural background0.05 mg/LMay 2026125 served Rogue Lea Estates-North/SouthNatural background0.25 mg/LJan 2026350 served City of Rogue RiverNatural background0.10 mg/LMay 20262,345 served Rogue River CampgroundNatural background0.25 mg/LJan 202660 served Rogue River Mobile EstatesNatural background0.25 mg/LJan 202672 served Rogue Riviera EstatesNatural background0.10 mg/LAug 202533 served City of RoseburgNatural background0.05 mg/LJul 202528,800 served Roth DevelopmentNatural background0.25 mg/LApr 202627 served Round Lake Water UtilitiesNatural background0.12 mg/LNov 2025250 served Row River Valley Water DistNatural background0.05 mg/LNov 2025340 served Rowena Dell Water SystemNatural background0.05 mg/LJun 202630 served Roxy Ann Heights Hoapurchased waterNatural background0.10 mg/LAug 202530 served Royal EstatesNatural background0.05 mg/LJun 2026160 served Rt 53 Water Incpurchased waterNatural background0.94 mg/LNov 202580 served Rufus Public WorksHealth-study range5.66 mg/LJan 2026270 served Ryans OutpostNatural background0.69 mg/LMay 202565 served

S

Sacajawea Mobile Home ParkHuman impact likely1.46 mg/LJan 202690 served Saginaw Park Water SystemNatural background0.05 mg/LJan 202660 served Salem Mobile Estates/Shady AcresHuman impact clear4.98 mg/LJan 2026150 served Salem Public WorksNatural background0.03 mg/LApr 2026199,820 served Salmon River Rv ParkNatural background0.10 mg/LAug 202569 served Salmon River ValleyHuman impact likely1.31 mg/LDec 202575 served Salmon Valley Water CompanyNatural background0.34 mg/LAug 20251,500 served Sand-N-Wood Mobile VillaHuman impact likely1.97 mg/LSep 202560 served City of SandyNatural background0.18 mg/LFeb 202612,991 served Sandy Boulevard Mobile VillaNatural background0.03 mg/LMar 2026350 served Santiam Meadows Community WsNatural background0.20 mg/LDec 202540 served Santiam VillageHuman impact likely2.28 mg/LJul 2025150 served Saunders Creek HocNatural background0.24 mg/LNov 202575 served Sauvie Island MoorageNatural background0.25 mg/LJun 202696 served City of ScappooseHuman impact likely1.02 mg/LMay 20268,710 served City of ScioNatural background0.05 mg/LOct 2025900 served Scio Mobile VillageHuman impact clear4.35 mg/LSep 202540 served Scofield Mobile Home CourtNatural background0.10 mg/LOct 202539 served City of Scotts MillsNatural background0.01 mg/LNov 2025421 served Scravel Hill Water Co-OpHuman impact clear3.02 mg/LApr 2026300 served Sea Crestpurchased waterNatural background0.11 mg/LOct 202572 served Seal Rock Water DistrictNatural background0.55 mg/LApr 20256,000 served Seaside Water DepartmentNatural background0.16 mg/LFeb 20267,482 served Seavey Loop Water CompanyHuman impact clear4.21 mg/LFeb 2026110 served City of SenecaHuman impact likely2.38 mg/LJan 2026200 served Shadow Hills Park Water Co-OpNatural background0.05 mg/LJun 202645 served Shady Acres Mhp, LlcNatural background0.10 mg/LSep 202570 served Shady Cove Mhppurchased waterNatural background0.10 mg/LOct 2025140 served Shady Rest Mobile CourtHuman impact clear3.32 mg/LMar 2026110 served Shady Trails Rv ParkNatural background0.34 mg/LJan 202660 served Shangri-La Water DistrictNatural background0.11 mg/LJul 2025200 served Shaniko Water SystemHuman impact likely2.38 mg/LJan 202638 served Shelley Road-Crest Acres Wdpurchased waterNatural background0.10 mg/LMay 2026430 served Shenandoah Homeowners IncNatural background0.50 mg/LApr 202584 served City of SheridanNatural background0.10 mg/LMar 20266,494 served City of SherwoodNatural background0.40 mg/LSep 202519,885 served Shield Crest CondosNatural background0.12 mg/LSep 202545 served Shield Crest Water AssnNatural background0.46 mg/LDec 202565 served Shoun CrossroadsNatural background0.50 mg/LJan 202641 served Sigler Cove MarinaNatural background0.25 mg/LAug 2025150 served City of SiletzNatural background0.05 mg/LSep 20251,235 served Silver Spur Rv Park LlcNatural background0.04 mg/LJan 2026275 served City of SilvertonNatural background0.41 mg/LFeb 202510,484 served Silverton Mobile EstatesNatural background0.10 mg/LJul 202545 served City of SistersNatural background0.84 mg/LJul 20253,778 served Sky Crest Heights HomeownersHuman impact likely1.45 mg/LJan 202644 served Skylands Water CompanyNatural background0.32 mg/LJun 2026250 served Skyline View Dist ImprovementNatural background0.89 mg/LAug 2025250 served Skyridge HoaNatural background0.05 mg/LMay 202546 served Skyview Acres Water Companypurchased waterNatural background0.18 mg/LFeb 2026200 served Sleepy Hollow Water DistrictNatural background0.19 mg/LDec 2025135 served Smgv/Widgi CreekNatural background0.09 mg/LJun 2025300 served Smith Rock Mobile EstatesHuman impact clear4.80 mg/LMay 202560 served Sno-Cap Water SystemNatural background0.44 mg/LNov 202590 served City of SodavilleNatural background0.10 mg/LApr 2025320 served South Coast Water CompanyNatural background0.05 mg/LOct 2025200 served South Fork Forest CampNatural background0.03 mg/LNov 2025200 served South Fork Water BoardNatural background0.21 mg/LFeb 20260 served South Hills Water SystemNatural background0.14 mg/LFeb 2026250 served South Prairie Water Assnpurchased waterHuman impact likely2.11 mg/LSep 2025440 served South Umpqua Water Associationpurchased waterNatural background0.05 mg/LMay 2026575 served South Yamhill Water Districtpurchased waterNatural background0.25 mg/LSep 202540 served Southview Improvement DistNatural background0.10 mg/LAug 202535 served Southwood Park Water DistrictNatural background0.25 mg/LFeb 2025900 served Spar Tree MhpNatural background0.03 mg/LNov 202526 served Sportsmans Paradise Motel/TcNatural background0.67 mg/LNov 202552 served Sportsmans Park Water AssnNatural background0.05 mg/LMar 2026150 served Sprague River Water AssnNatural background0.12 mg/LMar 202660 served City of SprayHuman impact likely2.66 mg/LJan 2026139 served Springbrook Water AssociationNatural background0.49 mg/LMay 202538 served Springfield Utility BoardNatural background0.06 mg/LSep 202562,100 served Springwater EstatesHuman impact likely2.01 mg/LAug 2025130 served City of St HelensHuman impact likely2.13 mg/LJun 202513,410 served City of St PaulNatural background0.18 mg/LJun 2026434 served Staffordshire Water SystemHuman impact likely1.37 mg/LMar 2025150 served City of StanfieldNatural background0.05 mg/LOct 20252,115 served Stanfield HutterianNatural background0.06 mg/LDec 202580 served Star Satellite Improv DistNatural background0.12 mg/LMay 2026400 served Starlite Mobile VillageHuman impact clear3.43 mg/LApr 2025250 served City of StaytonNatural background0.10 mg/LFeb 20268,400 served Steeves Mobile CityNatural background0.25 mg/LMar 202680 served Stewarts AdditionNatural background0.50 mg/LMar 202650 served Storlie Water CompanyNatural background0.40 mg/LOct 202550 served City of SublimityNatural background0.10 mg/LJul 20253,140 served Suburban East Salem Wdpurchased waterNatural background0.03 mg/LApr 202613,900 served Sumner Water CorporationNatural background0.92 mg/LDec 202550 served City of SumpterNatural background0.50 mg/LJan 2026208 served Sun Mountain Water System LlcNatural background0.14 mg/LOct 2025740 served Sunburst Acres SubdivisionNatural background0.10 mg/LDec 202526 served Sundowner Mobile Home ParkHuman impact likely1.30 mg/LJan 2026160 served Sunny Acres Water Districtpurchased waterNatural background0.25 mg/LSep 2025130 served Sunny Slope Mobile RanchNatural background0.10 mg/LFeb 202625 served Sunnycrest Meadows WsNatural background0.14 mg/LApr 202629 served Sunnyview Mobile Home ParkNatural background0.10 mg/LJun 2026100 served Sunridge Estates LowerHuman impact likely1.85 mg/LMay 202571 served Sunridge Estates UpperHuman impact likely1.04 mg/LMay 202528 served Sunridge Water IncHealth-study range9.40 mg/LApr 2026200 served Sunrise Water AuthorityNatural background0.05 mg/LNov 202550,003 served Sunriver Water Llc/Sunriver UtilitiesNatural background0.07 mg/LMay 20254,300 served Sunset Acres Water Co-Op IncNatural background0.26 mg/LSep 202570 served Sunset Hills Domestic Water AssociationHuman impact likely1.03 mg/LNov 202541 served Sunset Lake Rv ParkNatural background0.05 mg/LMar 2026170 served Sunset Village MhpNatural background0.10 mg/LApr 2025120 served Sunset Water System IncNatural background0.05 mg/LSep 2025140 served Sunshine VillageNatural background0.98 mg/LAug 202595 served Surfwood Villa HoaNatural background0.44 mg/LNov 2025200 served City of SutherlinNatural background0.13 mg/LAug 20258,060 served Sw Lincoln Co Water PudNatural background0.36 mg/LDec 20253,000 served Swedetown Water AssocNatural background0.19 mg/LNov 202540 served City of Sweet HomeNatural background0.05 mg/LMar 202610,322 served Swisshome VillageNatural background0.58 mg/LApr 202624 served

T

Table Rock Mobile Estates (South)Human impact likely2.09 mg/LJan 2026150 served City of Talentpurchased waterNatural background0.10 mg/LAug 20256,293 served Tamarack Mobile Home ParkHuman impact clear3.71 mg/LApr 202680 served Taylors Grove Water WorksHuman impact likely2.05 mg/LDec 202528 served Taylors Landing Rv ParkNatural background0.05 mg/LSep 202548 served Terrace Mobile PlazaHuman impact likely2.38 mg/LJan 2026152 served Terrand Mobile TerraceNatural background0.06 mg/LNov 202571 served Terrebonne Domestic Water DistrictHuman impact likely1.50 mg/LNov 20251,400 served City of The DallesNatural background0.03 mg/LSep 202513,010 served Thurston Oaks MhpHuman impact likely1.92 mg/LMay 202638 served Tideland Water Co-Oppurchased waterNatural background0.94 mg/LNov 202518 served Tierra Del Mar Water CoNatural background0.85 mg/LNov 202580 served Tierra Linda EstatesHealth-study range6.19 mg/LSep 2025450 served City of TigardNatural background0.21 mg/LOct 202562,500 served City of Tillamook Water DeptHuman impact likely2.11 mg/LSep 20255,265 served Tillicum Park LlcNatural background0.66 mg/LJun 202634 served Timber Water AssociationNatural background0.13 mg/LJan 2025180 served Timberline Rim Water Co IncNatural background0.02 mg/LAug 2025800 served Tivoli Mobile Home ParkNatural background0.66 mg/LSep 202594 served Toledo Water UtilitiesNatural background0.68 mg/LMar 20263,645 served Tollgate Water CompanyNatural background0.48 mg/LJul 2025800 served Tone Water Districtpurchased waterHuman impact likely2.11 mg/LSep 202575 served Tooley Water DistrictAbove the federal limit10.80 mg/LMar 202697 served Totem Village MhpHuman impact likely2.38 mg/LFeb 202670 served Trailer Park VillageHuman impact likely2.25 mg/LApr 2025105 served Tri-City Jw&SaNatural background0.05 mg/LFeb 20263,500 served Trollers Cove Water AssnHuman impact likely1.88 mg/LApr 202532 served City of TroutdaleHuman impact likely1.26 mg/LOct 202516,185 served City of TualatinNatural background0.05 mg/LMay 202428,106 served Tualatin Valley Water DistrictNatural background0.61 mg/LSep 2023224,600 served City of Turnerpurchased waterNatural background0.03 mg/LApr 20262,866 served Twin Cedars MhpNatural background0.50 mg/LNov 2025200 served Twin Island CommunityNatural background0.05 mg/LJun 202570 served Tygh Valley Water DistrictNatural background0.50 mg/LOct 2025218 served

U

City of UkiahNatural background0.50 mg/LJan 2026235 served City of UmatillaNatural background0.50 mg/LJun 20268,256 served Umpqua Basin Water AssocNatural background0.05 mg/LJun 20269,499 served Umpqua Ranch CoopNatural background0.05 mg/LMar 2026161 served City of UnionNatural background0.50 mg/LFeb 20262,162 served Union Gap Water Districtpurchased waterNatural background0.13 mg/LAug 2025150 served City of UnityNatural background0.30 mg/LDec 202471 served Usfs Toketee Ranger StationNatural background0.22 mg/LJun 2026150 served Usfs Wolf Creek Job CorpsNatural background0.05 mg/LFeb 2026291 served

V

City of ValeHuman impact clear4.39 mg/LSep 20251,837 served Valley Court ApartmentsHuman impact likely2.89 mg/LSep 202534 served Valley View Water Co-Oppurchased waterNatural background0.03 mg/LAug 202599 served Valley View Water Districtpurchased waterNatural background0.11 mg/LJul 20251,034 served Valley Vista Water Improv DistNatural background0.10 mg/LApr 202548 served City of VenetaNatural background0.05 mg/LAug 20255,200 served City of VernoniaNatural background0.17 mg/LApr 20252,100 served Victoria Court SubdivisionHuman impact likely2.94 mg/LOct 202570 served Vida-Lea Community CooperativeNatural background0.15 mg/LApr 202645 served View Point Trailer CourtNatural background0.50 mg/LDec 2024160 served Villadom Mobile Home ParkNatural background0.50 mg/LJan 2025115 served Village At Seavey LoopNatural background0.05 mg/LJan 2026150 served Village At Valley ViewNatural background0.23 mg/LDec 2025110 served Vincent Water CompanyHuman impact clear4.21 mg/LMar 202690 served Vineyard Mountain WaterHuman impact likely1.39 mg/LApr 2025325 served Vista Home ParkHealth-study range5.61 mg/LMar 2026300 served

W

City of WaldportNatural background0.27 mg/LAug 20252,300 served Wallace Acres Water CompanyNatural background0.50 mg/LJan 202680 served City of WallowaHuman impact likely1.17 mg/LNov 2025840 served Wallowa Lake Co Service DistHuman impact clear3.36 mg/LMay 2026350 served Walnut Mobile Home ParkNatural background0.25 mg/LMar 2026200 served Wamic Water AssociationHuman impact likely1.97 mg/LDec 2025130 served Wapato Moorage AssociationNatural background0.25 mg/LJun 202674 served Warren Water AssociationNatural background0.05 mg/LFeb 20262,050 served City of WarrentonNatural background0.31 mg/LFeb 20269,100 served City of WascoHuman impact likely1.41 mg/LApr 2026460 served Water Wonderland Improv Dist 1Natural background0.07 mg/LJul 2025550 served Water Wonderland Improv Dist 2Natural background0.07 mg/LJul 20251,800 served Watseco-Barview Water Districtpurchased waterNatural background0.83 mg/LMay 2026450 served Watsonville Water SystemHuman impact likely1.11 mg/LJan 202527 served Wauna Water DistrictNatural background0.51 mg/LSep 2025188 served Weiss Estates Water SystemNatural background0.10 mg/LNov 202536 served Welches Water CompanyNatural background0.03 mg/LApr 202660 served Weldon Mobile Home ParkHuman impact likely2.20 mg/LAug 2025108 served Weslinn Water CompanyHuman impact clear3.56 mg/LJun 2026200 served West Gregory Mhp SouthNatural background0.10 mg/LOct 202530 served West Hills Water Companypurchased waterHuman impact likely2.11 mg/LSep 2025299 served West Laurel Acres Water CoNatural background0.52 mg/LFeb 202665 served City of West Linnpurchased waterNatural background0.21 mg/LFeb 202628,000 served West Slope Water Districtpurchased waterNatural background0.11 mg/LJul 202511,000 served West Yamhill Water Companypurchased waterNatural background0.25 mg/LSep 202556 served Western Heights Water CompanyNatural background0.15 mg/LMar 202690 served Western Hills Mh EstatesNatural background0.05 mg/LJun 2025375 served Western Wagon VillageHuman impact likely1.70 mg/LMar 2026112 served City of WestfirNatural background0.05 mg/LDec 2025268 served Westland Water AssociationHuman impact likely1.18 mg/LJan 202625 served City of WestonNatural background0.50 mg/LApr 2026714 served Westport HeightsNatural background0.25 mg/LMar 202590 served Westport Water Associationpurchased waterNatural background0.51 mg/LSep 2025550 served Westridge SubdivisionNatural background0.50 mg/LMay 202578 served Westridge Water DistrictNatural background0.05 mg/LSep 202578 served Westview Mobile EstatesNatural background0.35 mg/LJan 2026250 served Whaleshead Beach Resort, LlcHuman impact likely1.56 mg/LMay 2026108 served City of WheelerNatural background0.94 mg/LNov 2025400 served Whispering Pines Mobile LodgeHuman impact likely2.11 mg/LJun 202590 served Whitehorse Rv VillageHuman impact likely1.76 mg/LJan 202672 served Wickiup Water DistrictNatural background0.75 mg/LJun 20251,630 served Willamettans, TheNatural background0.42 mg/LOct 202560 served Willamette Water Companypurchased waterNatural background0.03 mg/LMay 2026468 served City of WillaminaNatural background0.29 mg/LJan 20262,239 served Willow Dale Water Districtpurchased waterNatural background0.46 mg/LMar 2026310 served Willow Estates Mobile Home PkNatural background0.99 mg/LJan 2026250 served Willow Glen SubdivisionHuman impact likely1.88 mg/LJan 202660 served City of WilsonvilleNatural background0.55 mg/LJan 202525,915 served Winchester RidgeNatural background0.27 mg/LFeb 202650 served Winston-Dillard Water DistrictNatural background0.05 mg/LApr 20268,300 served Wisemans Mobile CourtNatural background0.55 mg/LDec 2024114 served Wolsborn Farms Water DistrictHuman impact likely2.31 mg/LFeb 202690 served City of Wood VillageHuman impact likely2.29 mg/LAug 20254,388 served City of WoodburnNatural background0.06 mg/LMar 202529,455 served Woodburn Mobile EstatesNatural background0.05 mg/LFeb 202670 served Woodland Mobile Home ParkNatural background0.05 mg/LOct 202591 served Workman Air Park #3Natural background0.11 mg/LSep 202575 served Wunder Mobile ParkNatural background0.02 mg/LJun 2026100 served

Y

City of YachatsNatural background0.19 mg/LJun 20261,006 served City of YamhillNatural background0.25 mg/LSep 20251,199 served City of YoncallaNatural background0.05 mg/LOct 20251,050 served Young LifeNatural background0.84 mg/LFeb 2026497 served Youngs River Lewis & Clark WdNatural background0.69 mg/LDec 20252,580 served

Z

Zig Zag Village Water SystemNatural background0.07 mg/LFeb 202580 served Zig Zag Water Co-OpNatural background0.17 mg/LSep 202560 served Zoomtown Rv ParkNatural background0.10 mg/LJan 202646 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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Educational information, not medical or personal safety advice.