Maryland

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Maryland system directory

Find a community water system

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

458

systems with a current result

5,524,944

people served by them

37

systems carrying a supplier result

32

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 458 of 458 systems

A

City of AberdeenHuman impact likely2.59 mg/LMar 202618,006 served Town of AccidentHuman impact likely1.50 mg/LJan 2026300 served Amelano ManorHealth-study range6.60 mg/LSep 202536 served Angelica Nurseries - Nursery ViewHealth-study range7.20 mg/LJul 202538 served City of AnnapolisNatural background0.15 mg/LApr 202635,000 served Aqualand CampgroundNatural background0.15 mg/LJan 2026240 served Autumn Lake HealthcareHuman impact likely1.20 mg/LFeb 2025290 served Avon CrestNatural background0.05 mg/LJul 202579 served

B

B&L Mobile Home ParkNatural background0.50 mg/LFeb 202665 served Backbone Mountain Boys CampNatural background0.03 mg/LJan 202660 served City of BaltimoreHuman impact likely1.12 mg/LJul 20251,600,000 served Banks OdeeNatural background0.15 mg/LJan 202665 served Bark HillHuman impact clear4.10 mg/LJan 2026163 served BarrelvilleNatural background0.10 mg/LSep 2025130 served Bay Country Estates Mobile Home ParkHuman impact clear3.78 mg/LOct 2025276 served Bay Country Mobile Home ParkNatural background0.50 mg/LJan 2026300 served Bayside VillageNatural background0.25 mg/LJan 202550 served Bayview At Kent NarrowsNatural background0.25 mg/LJan 202575 served Bb Apartments (Prev Woc Village Apts)Natural background0.45 mg/LMay 202640 served Beach HarborNatural background0.25 mg/LMar 2025481 served Beaches Water Co-OperativeNatural background0.25 mg/LMar 20252,000 served Beantown Park- Woodley RoadNatural background0.05 mg/LFeb 2026127 served Beaver Run Mobile Home ParkNatural background0.50 mg/LMay 2026275 served Bel Air - Pinto Distribution Systempurchased waterNatural background0.50 mg/LApr 20242,614 served Bel AltonNatural background0.05 mg/LJan 2026311 served Bellewood Water AssociationHuman impact likely1.00 mg/LJul 202575 served BenedictNatural background0.05 mg/LMar 2026376 served Benedictine SchoolHealth-study range9.40 mg/LApr 2026300 served Benjamins Village/Homestead M.H.P.Human impact likely1.72 mg/LSep 2025400 served Bennett Mobile Home ParkHuman impact clear4.90 mg/LApr 202560 served Town of BerlinHuman impact clear4.60 mg/LFeb 20254,500 served Best Rental Housing, Inc.Human impact likely2.80 mg/LApr 202568 served Town of BettertonHealth-study range5.40 mg/LJan 2025481 served Birch ManorHuman impact likely1.00 mg/LFeb 2026272 served BloomingtonNatural background0.84 mg/LMar 2026350 served Boh-Nak Mobile Home ParkHealth-study range8.40 mg/LJul 202585 served Bonnie BrookNatural background0.50 mg/LJan 2026390 served Boones Mobile EstatesNatural background0.50 mg/LApr 20261,315 served Boonsboro - KeedysvilleHuman impact clear4.80 mg/LApr 20264,250 served City of BowieNatural background0.50 mg/LJul 202525,000 served Bradford EstatesHealth-study range6.80 mg/LFeb 2025178 served Breton BayHuman impact likely1.00 mg/LMar 20261,012 served Briddletown Distribution Systempurchased waterHuman impact clear4.60 mg/LFeb 2025150 served Broad CreekNatural background0.50 mg/LJul 202526,033 served Brook Lane Health ServicesHuman impact likely1.60 mg/LJan 2026175 served Brophytown Distribution Systempurchased waterNatural background0.34 mg/LJan 202647 served City of BrunswickNatural background0.68 mg/LMay 20267,312 served Bryans RoadNatural background0.05 mg/LMar 20266,260 served

C

Calvert Beach - Decatur StreetNatural background0.25 mg/LMar 2026350 served Calvert Beach / Forest TrailNatural background0.25 mg/LMar 2026100 served Calvert ManorNatural background0.25 mg/LMar 2026300 served Calvert Mobile Home ParkNatural background0.50 mg/LMay 202580 served Cambridge FarmsHuman impact likely2.70 mg/LApr 2026953 served City of Cambridge WaterNatural background0.25 mg/LMay 202515,000 served Campus Hills Water WorksHuman impact clear4.00 mg/LJan 2026250 served Caroline Acres Mobile Home ParkNatural background0.50 mg/LMar 2026395 served Carpenters Point Water Co.Health-study range5.37 mg/LJan 2026400 served Cavalier CountryNatural background0.15 mg/LApr 2026381 served Cecil Woods M.H.P. Distribution Systempurchased waterHuman impact likely1.00 mg/LJan 2026320 served Cecil Woods Mobile Home Park WtpHuman impact likely1.00 mg/LJan 2026285 served Town of CeciltonNatural background0.10 mg/LMar 2025477 served Cecilton Manor Mobile Home ParkNatural background0.25 mg/LOct 202560 served Cedar CoveHuman impact likely1.00 mg/LFeb 20262,728 served Cedar Mobile Home ParkNatural background0.50 mg/LFeb 2026300 served Cedar Ridge Children'S Home & SchoolHealth-study range5.90 mg/LApr 202645 served Cedarhurst Mobile Home ParkNatural background0.25 mg/LJul 2025220 served Cedarville Mobile Home ParkNatural background0.25 mg/LApr 2026780 served Town of CentrevilleNatural background0.50 mg/LFeb 20263,322 served Chapel Hill - Aberdeen Proving GroundsNatural background0.50 mg/LMar 202615,000 served Chapel Hill Nursing CenterHealth-study range7.84 mg/LApr 2026125 served Chapel Point Wds/ Jude House/ Comm CtrNatural background0.05 mg/LApr 2026280 served Charles County Gardens WaterNatural background0.25 mg/LMar 2026551 served Town of CharlestownNatural background0.50 mg/LMar 20263,791 served Charlotte HallHuman impact likely1.00 mg/LFeb 2026615 served Charlotte Hall Va HomeNatural background0.03 mg/LFeb 2026270 served Cheltenham Boys VillageNatural background0.03 mg/LJan 2026330 served Town of Chesapeake BeachNatural background0.25 mg/LMar 20255,000 served Chesapeake Estates Mobile Home ParkNatural background0.25 mg/LMar 2025159 served Chesapeake Heights (Bayside Forest)Natural background0.20 mg/LJun 20251,190 served Chesapeake Ranch EstatesHuman impact likely1.00 mg/LNov 20259,500 served Town of ChestertownHuman impact likely1.50 mg/LMar 20255,400 served Chestnut Point Estates Distribution Sys.purchased waterNatural background0.50 mg/LJun 202532 served Chestnut Point Estates WtpNatural background0.50 mg/LJun 202582 served Christmas Tree Farm Trailer ParkNatural background0.25 mg/LJan 2026100 served Church Hill Condo, Inc. (The Pond)Natural background0.03 mg/LFeb 202625 served Cinnamon WoodsHuman impact likely2.70 mg/LSep 202560 served ClaiborneNatural background0.25 mg/LJan 202560 served Town of Clear SpringNatural background0.60 mg/LApr 2026455 served Clear View Mobile Home Park LlcHuman impact likely1.80 mg/LJan 202528 served Cliffton On The PotomacNatural background0.05 mg/LFeb 2026744 served Cloverhill 3 - Consecutive To Md0100015purchased waterHuman impact likely1.60 mg/LJun 2026888 served Colonial Mill Estates Mobile Home ParkHealth-study range5.40 mg/LJan 202586 served Concord Estates Mobile Home ParkHuman impact likely1.89 mg/LJul 2025150 served Conowingo Mobile Home ParkHuman impact clear3.90 mg/LMar 2025250 served Cook'S Trailer Court (Aka Garrett Tp)Natural background0.25 mg/LJan 2026120 served CopperfieldNatural background0.10 mg/LJul 2025338 served Country LakesHuman impact likely1.00 mg/LMar 20263,016 served Country Meadows of Frederickpurchased waterHuman impact likely1.00 mg/LApr 2026295 served Country Village Mobile Home ParkNatural background0.25 mg/LJan 202538 served CrellinNatural background0.01 mg/LMar 2026230 served City of CrisfieldNatural background0.25 mg/LMar 20252,976 served Crofton-OdentonNatural background0.50 mg/LJul 202562,986 served Cross Point SubdivisionNatural background0.15 mg/LApr 2026434 served Crownsville Hospital CenterNatural background0.10 mg/LJul 20241,348 served Crystal Beach Manor/T&C UtilityHuman impact likely2.00 mg/LJan 2025500 served City of CumberlandNatural background0.50 mg/LApr 202427,039 served

D

Town of DarlingtonHuman impact clear4.40 mg/LJan 2026250 served Darlington Mobile Home ParkHuman impact clear3.30 mg/LJan 2025150 served Deep Creek Lake Water Service AreaHuman impact clear3.81 mg/LMar 20265,502 served Deep Roots Inc.Natural background0.25 mg/LJan 202560 served Deer Lodge Mobile Home ParkNatural background0.50 mg/LJan 202687 served Town of Deer ParkNatural background0.01 mg/LJun 2025272 served Town of DelmarHuman impact likely2.80 mg/LFeb 20254,500 served Delmarva Mobile Home ParkNatural background0.25 mg/LJan 202562 served Town of DentonNatural background0.50 mg/LJul 20254,500 served Dorchester Country Estates M.H.P.Natural background0.25 mg/LJan 2025118 served Dover Bridge ParkNatural background0.50 mg/LMar 2026100 served Du Mar Estates Water CompanyHuman impact likely1.00 mg/LJul 2025150 served

E

Town of East New MarketNatural background0.25 mg/LJan 2025400 served Eastern Correctional InstituteNatural background0.07 mg/LJan 20263,500 served Eastern Region Allegany Distrib. Systempurchased waterNatural background0.50 mg/LApr 20245,703 served Easton UtilitiesNatural background0.25 mg/LJul 202517,357 served Eden Mobile Home ParkNatural background0.25 mg/LJan 2025250 served Edesvillepurchased waterNatural background0.25 mg/LJan 2025296 served El Rancho Mobile Home ParkHuman impact likely2.02 mg/LMay 202686 served Elk Ridge LakeNatural background0.12 mg/LApr 2026120 served Elkridge Estates of Roland Parkpurchased waterHuman impact likely1.12 mg/LJul 2025414 served Town of ElktonHuman impact clear3.61 mg/LMar 202615,625 served Elkton Westpurchased waterHealth-study range7.70 mg/LApr 20263,500 served EllenwoodNatural background0.05 mg/LApr 2026229 served Town of EmmitsburgNatural background0.69 mg/LAug 20252,921 served Epping ForestNatural background0.25 mg/LMar 2025500 served Ewell Waterworks CooperativeNatural background0.50 mg/LAug 202575 served

F

Fahrney-Keedy Senior Living CommunityHuman impact clear4.50 mg/LApr 2026250 served Fairland Crossing Apartmentspurchased waterHuman impact likely1.15 mg/LMay 20261,248 served FairleeNatural background0.25 mg/LJan 2025725 served FairmountNatural background0.08 mg/LFeb 2026750 served Town of FederalsburgNatural background0.25 mg/LFeb 20252,450 served Fenwick ManorHuman impact likely1.00 mg/LFeb 2026234 served Forest Green Court Mobile Home ParkNatural background0.50 mg/LMar 2026212 served Forrest Farm SubdivisionHuman impact likely1.00 mg/LMar 2026577 served Fort DetrickHuman impact likely2.30 mg/LJan 20267,900 served Fort George G. MeadeNatural background0.01 mg/LJan 202662,234 served Fountain Green Mobile Home ParkHuman impact likely1.55 mg/LJan 202655 served Fountaindale SouthHuman impact likely2.60 mg/LFeb 20262,610 served Four Seasons Park Inc.Natural background0.25 mg/LJan 202525 served Fox MeadowHuman impact likely1.00 mg/LFeb 2026128 served Fox Run Condominiums, Inc.Natural background0.03 mg/LFeb 202685 served City of FrederickHuman impact likely1.60 mg/LJun 202654,000 served Freedom DistrictNatural background0.80 mg/LJan 202624,867 served Town of FriendsvilleNatural background0.58 mg/LMar 2026622 served City of FrostburgNatural background0.59 mg/LJan 202611,000 served City of FruitlandHuman impact likely1.70 mg/LAug 20255,907 served Town of Funkstown Distribution Systempurchased waterHuman impact likely1.02 mg/LMar 20261,300 served

G

Gaither Manor ApartmentsHealth-study range8.10 mg/LApr 2026450 served Town of GalenaNatural background0.25 mg/LJan 2025560 served Garden Estates Central WaterNatural background0.15 mg/LMar 202655 served Garrett Children'S CenterNatural background0.03 mg/LJan 202645 served Gateway Village Mobile Home ParkHuman impact clear4.20 mg/LApr 202560 served Gibson IslandNatural background0.10 mg/LJul 2024275 served Gilberts Mobile Home ParkHuman impact clear3.69 mg/LApr 202675 served Glen Burnie-BroadneckNatural background0.50 mg/LJul 2025290,606 served Glen Meadows Retirement CommunityHuman impact clear3.10 mg/LDec 2025468 served Golden Acres Mobile Home ParkNatural background0.25 mg/LJan 202548 served Golden Kay ApartmentsHuman impact clear3.42 mg/LApr 2024148 served GormanNatural background0.25 mg/LApr 2026150 served Gramercy Llc (Aka Koinonia Partnership )Human impact likely2.80 mg/LDec 202540 served Grandview HavenHuman impact likely1.00 mg/LFeb 2026269 served Granite Mobile Home ParkHuman impact clear3.04 mg/LApr 202696 served Town of GrantsvilleNatural background0.26 mg/LMar 2026885 served GrasonvilleNatural background0.50 mg/LJun 2026600 served Graymount ApartmentsHuman impact likely1.70 mg/LJan 202527 served Green Meadows Compact HomesNatural background0.25 mg/LJan 202586 served Green Meadows Water CompanyNatural background0.25 mg/LJan 202568 served Green Ridge Boys CampNatural background0.50 mg/LJul 2025100 served GreenbrierHuman impact likely1.00 mg/LFeb 20261,161 served Greenridge SubdivisionHuman impact clear3.18 mg/LApr 20262,271 served Town of GreensboroNatural background0.50 mg/LFeb 20261,878 served Greenway ApartmentsHuman impact likely1.60 mg/LJan 202640 served

H

City of HagerstownHuman impact likely1.02 mg/LMar 202692,200 served Town of HampsteadHealth-study range8.27 mg/LJun 20266,600 served Town of HancockHuman impact likely1.06 mg/LOct 20251,921 served Harbor ViewNatural background0.50 mg/LOct 2025437 served Harbour Light Estates CommunityHuman impact likely1.60 mg/LJan 202595 served Harford County D.P.W.Human impact clear3.56 mg/LMay 2026104,567 served Harman SubdivisionNatural background0.50 mg/LDec 202535 served Hart HeritageHuman impact clear3.00 mg/LJan 202537 served City of Havre De GraceHuman impact likely1.79 mg/LMar 202614,000 served Hawthorne Water Supply, IncNatural background0.25 mg/LMar 202660 served Hearts DesireHuman impact likely1.00 mg/LFeb 202665 served Town of HebronNatural background0.25 mg/LJan 20251,022 served Hebron Woods Mobile Home ParkHuman impact likely1.70 mg/LJan 2025250 served Town of HendersonNatural background0.50 mg/LFeb 2026156 served Herald HarborNatural background0.10 mg/LJul 20242,241 served Heritage Mobile Home ParkNatural background0.25 mg/LJan 202580 served HighfieldHuman impact likely2.20 mg/LApr 20261,141 served Highland Estates Distribution Systempurchased waterNatural background0.50 mg/LApr 2024105 served Hill Waterworks CooperativeNatural background0.50 mg/LAug 2025100 served Hillandale Mobile Home ParkHealth-study range7.10 mg/LApr 2026220 served Holiday Mobile Estates, Inc.Natural background0.25 mg/LJan 2025900 served Holland ForestHuman impact likely1.00 mg/LMar 2026139 served Holly Cove Harbor Mobile Home ParkNatural background0.25 mg/LJan 202545 served Howard County D.P.W. Distributionpurchased waterHuman impact likely1.15 mg/LMay 2026286,158 served Hunters Brooke/Falcon Ridge SubdNatural background0.05 mg/LJun 2025614 served Hunting HillsNatural background0.20 mg/LMay 2025124 served Hunting QuartersHuman impact likely1.00 mg/LFeb 2026715 served Town of HurlockHuman impact clear4.20 mg/LJan 20252,150 served

I

Idlewood ParkNatural background0.50 mg/LMar 2026320 served Independence VillageNatural background0.25 mg/LJan 202588 served Town of Indian HeadNatural background0.20 mg/LFeb 20254,100 served

J

Jonestown Water SystemNatural background0.50 mg/LJan 2026150 served

K

KennedyvilleNatural background0.25 mg/LJan 2025300 served Kenwood BeachNatural background0.15 mg/LApr 2026338 served Keswick Multi-Care Centerpurchased waterHuman impact likely1.12 mg/LJul 2025575 served Keysers RidgeNatural background0.01 mg/LMar 202663 served King & KennedyHuman impact likely1.00 mg/LFeb 2026169 served Kings Manor - White Plains Water Co, IncNatural background0.25 mg/LMar 2026372 served Town of KitzmillerNatural background0.03 mg/LMay 2025370 served Knolls of WindsorHealth-study range5.80 mg/LMay 20261,553 served

L

Town of La PlataNatural background0.61 mg/LJan 202611,535 served Lake Haven Mobile Home ParkNatural background0.25 mg/LJan 2025384 served Lake Village TownhomesHuman impact clear4.50 mg/LFeb 20252,400 served Lakeside Villagepurchased waterHuman impact likely1.02 mg/LMar 20261,575 served Lakeside VistaHealth-study range5.85 mg/LJan 2026219 served Lakeview Mhp LlcHealth-study range6.21 mg/LJan 202676 served LakewoodNatural background0.15 mg/LApr 2026203 served Langley Mobile Home ParkNatural background0.25 mg/LJan 2026175 served Laurel RidgeHuman impact likely1.00 mg/LFeb 2026560 served Laurel Water SupplyNatural background0.25 mg/LJan 202550 served Lavale Sanitary CommissionNatural background0.00 mg/LApr 20265,500 served Town of LeonardtownHuman impact likely1.00 mg/LMar 20255,000 served Leonardtown FarmHuman impact likely1.00 mg/LMar 2026193 served Lexington EstatesNatural background0.25 mg/LMar 2026300 served Lexington ParkHuman impact likely1.00 mg/LFeb 202643,030 served Liberty Mobile Home ParkNatural background0.25 mg/LJul 202540 served Libertytown ApartmentsHealth-study range6.00 mg/LJan 202597 served Libertytown EastHuman impact clear3.30 mg/LMar 2026140 served Lodgecliffe Distribution Systempurchased waterNatural background0.25 mg/LMay 2025300 served Lord Calvert Trailer ParkNatural background0.25 mg/LJan 2026892 served Town of Lukepurchased waterNatural background0.34 mg/LJan 202668 served Lutheran Village At Miller'S Grantpurchased waterHuman impact likely1.15 mg/LMay 2026315 served Lyons Creek EstatesNatural background0.50 mg/LApr 2026750 served

M

Town of ManchesterHealth-study range5.26 mg/LJun 20264,954 served Maple Hill Mobile EstatesHuman impact likely1.83 mg/LSep 2025180 served Mariellen ParkNatural background0.05 mg/LFeb 2026184 served Marley RunNatural background0.20 mg/LMay 2025290 served Martingham Utilities CooperativeNatural background0.03 mg/LJan 2026675 served Maryland American Water CompanyHuman impact likely2.77 mg/LMay 202613,200 served Maryland American Water--Severn SystemHuman impact likely2.70 mg/LMar 20265,447 served Maryland Manor Mobile Home ParkNatural background0.50 mg/LApr 2026810 served Matthews ManorNatural background0.15 mg/LJan 202645 served Maybelle Manor Mobile Home ParkHuman impact likely1.40 mg/LAug 202550 served Mayo Center And ApartmentsNatural background0.07 mg/LJan 202660 served Meadow Mountain Boys CampNatural background0.13 mg/LJan 202663 served Meadowbrook CourtNatural background0.25 mg/LJan 202550 served Metropolitan of Baltimorepurchased waterHuman impact likely1.12 mg/LJul 2025414 served Town of MiddletownHuman impact likely2.81 mg/LSep 20254,288 served Midland-LonaconingNatural background0.74 mg/LJan 20265,000 served Midlothian Water CompanyHuman impact likely1.03 mg/LAug 2025300 served Midtown Waterworks CooperativeNatural background0.50 mg/LAug 202534 served Town of MillingtonNatural background0.50 mg/LMar 2026625 served Millington Distribution Systempurchased waterNatural background0.50 mg/LMar 2026260 served Misty Meadows 1 / Highland Hills M.H.P.Natural background0.50 mg/LFeb 2026460 served Misty Meadows 2 Mobile Home ParkHuman impact likely1.79 mg/LFeb 202670 served Mount AetnaNatural background0.50 mg/LApr 2026688 served Town of Mount AiryHuman impact clear4.20 mg/LAug 20259,890 served Mount Carmel WoodsNatural background0.05 mg/LJan 2026175 served Mount Pleasant Water Co., Inc.Natural background0.25 mg/LFeb 2026150 served Mount Saint Marys UniversityHuman impact likely1.60 mg/LMar 20261,900 served Mountain Hill Water CompanyNatural background0.50 mg/LNov 20252,154 served Town of Mountain Lake ParkNatural background0.34 mg/LMar 20263,000 served Mulberry SouthHuman impact likely1.00 mg/LMar 202665 served Town of MyersvilleHuman impact likely2.60 mg/LJan 20261,516 served Mystic HarbourNatural background0.50 mg/LSep 20255,945 served

N

Nantucket Point(Distribution-Delaware)purchased waterHuman impact likely1.85 mg/LJul 2025500 served Naval Support Facility, Indian HeadNatural background0.54 mg/LNov 20233,321 served Naylor Mill Village Mobile Home ParkHealth-study range5.90 mg/LApr 2025180 served Nelpine Mobile Home ParkNatural background0.25 mg/LJan 202570 served New Design - Frederick CountyHuman impact likely1.00 mg/LApr 202674,911 served Town of New WindsorHealth-study range5.50 mg/LApr 20261,732 served NewarkNatural background0.50 mg/LSep 2025325 served Newtown Estates - Tip Hill Water Co.Natural background0.25 mg/LMar 2026110 served Newtown VillageNatural background0.05 mg/LFeb 2026170 served Nielsen Mobile Home Park [Marsh Creek]Natural background0.50 mg/LMar 202635 served Town of North BeachNatural background0.25 mg/LMar 20253,000 served Town of North EastHuman impact clear4.65 mg/LFeb 20268,600 served Northfield ApartmentsHuman impact clear4.30 mg/LJan 202540 served

O

Oak Hill Water Company, LlcNatural background0.25 mg/LMar 2026180 served Oak Lane Mobile Home ParkHuman impact clear3.80 mg/LJan 202555 served Oak Ridge Mobile Home ParkNatural background0.25 mg/LJan 2025150 served Oak Terrace Mobile Home Park LlcNatural background0.25 mg/LJan 202530 served Town of OaklandHuman impact likely1.32 mg/LMar 20261,850 served OakwoodNatural background0.05 mg/LMar 202645 served Oblates of St. FrancisNatural background0.25 mg/LJan 202536 served Town of Ocean CityNatural background0.24 mg/LJun 202630,000 served Ocean PinesHuman impact clear3.21 mg/LSep 202511,890 served Town of OxfordNatural background0.50 mg/LDec 2025726 served Oyster CoveNatural background0.50 mg/LJun 2026600 served

P

Paris Oaks / Days EndNatural background0.15 mg/LApr 2026251 served Parkway Subdivision Water CompanyNatural background0.25 mg/LDec 202550 served Patuxent Mobile EstatesNatural background0.50 mg/LApr 2026450 served Patuxent Naval Air Station (Navfac-Wash)Human impact likely1.00 mg/LDec 202522,000 served Perry Point V.A. Medical CenterNatural background0.50 mg/LJul 20252,000 served Town of PerryvilleNatural background0.50 mg/LMay 20254,413 served Persimmon HillsHuman impact likely1.00 mg/LFeb 2026514 served Pheasant Ridge EstatesHuman impact likely1.50 mg/LJan 2025300 served PhoenixNatural background0.30 mg/LMay 202531 served Pin Oak ApartmentsNatural background0.25 mg/LJan 202540 served Pine Hill Water CompanyNatural background0.25 mg/LApr 2026140 served Pine HillsNatural background0.50 mg/LDec 2025953 served Pine Springs MhpNatural background0.25 mg/LJan 2025160 served Pine Trailer ParkNatural background0.15 mg/LJan 202665 served Pine Tree Mobile Home ParkNatural background0.25 mg/LJan 202591 served Piney Creek CorporationNatural background0.50 mg/LJan 202631 served Piney PointHuman impact likely1.00 mg/LFeb 2026672 served Piney Point LandingsHuman impact likely1.00 mg/LFeb 2026239 served Town of PittsvilleNatural background0.25 mg/LMar 20251,500 served Pleasant Hill Mobile Home ParkNatural background0.25 mg/LMar 202564 served Pleasant ValleyHuman impact likely1.30 mg/LJan 2026139 served Pleasant View Nursing HomeHuman impact clear3.02 mg/LApr 2025104 served City of Pocomoke CityNatural background0.50 mg/LAug 20254,100 served Polings Mobile Home ParkHuman impact likely1.07 mg/LApr 202680 served Pomfret Estates - Utilco, Inc.Natural background0.25 mg/LMar 2026150 served Pomonkey Water Company - Ford HeightsNatural background0.25 mg/LMar 2026125 served Pomunk Water Company Distribution Systempurchased waterNatural background0.05 mg/LMar 2026340 served Town of PoolesvilleHealth-study range5.81 mg/LApr 20266,005 served Port DepositHuman impact likely1.16 mg/LJan 2026725 served Potomac HeightsNatural background0.25 mg/LAug 20251,800 served Town of PrestonNatural background0.50 mg/LDec 2025750 served Prince FrederickNatural background0.15 mg/LMay 20264,371 served Town of Princess AnneNatural background0.50 mg/LFeb 20263,300 served Prospect BayNatural background0.50 mg/LJun 2026913 served

Q

Queens Castle Mobile Home ParkHealth-study range6.06 mg/LMar 202560 served Town of QueenstownNatural background0.50 mg/LMay 2026705 served

R

R & R EstatesHuman impact likely2.90 mg/LJan 202596 served Reckley Spring Community WaterNatural background0.30 mg/LDec 202578 served Red Hill Water Company, Inc.Natural background0.25 mg/LMar 2026200 served Regency Manor Mobile Home ParkNatural background0.50 mg/LJan 2026224 served Regency Park Assisted Living ResidenceNatural background0.15 mg/LApr 202685 served Reliance Mobile Home ParkNatural background0.50 mg/LJan 2026200 served Reservoir Trailer ParkHuman impact clear4.06 mg/LApr 202679 served Rhodes Point South WaterworksNatural background0.50 mg/LAug 2025100 served Riddle FarmNatural background0.50 mg/LSep 2025500 served Town of RidgelyNatural background0.25 mg/LMar 20251,600 served Rio Vista Plaza Mobile Home ParkNatural background0.25 mg/LJan 2025150 served Town of Rising Sunpurchased waterHuman impact likely1.77 mg/LJun 20262,200 served Riverside ComplexHuman impact likely2.57 mg/LJun 202660 served Riverview Mobile Home ParkNatural background0.25 mg/LJan 2025150 served Town of Rock HallNatural background0.25 mg/LJan 20251,750 served Rockbrook Village Mobile Home ParkHuman impact clear4.97 mg/LJan 2026150 served City of RockvilleNatural background0.50 mg/LSep 202552,000 served Rocky Gap Mobile Home ParkNatural background0.35 mg/LJul 202530 served Rolling AcresHuman impact likely1.00 mg/LFeb 2026699 served Rose HavenNatural background0.50 mg/LJul 2025235 served Rosemont Distribution Systempurchased waterNatural background0.68 mg/LMay 2026237 served Route 7 Distribution Systempurchased waterHuman impact clear3.61 mg/LMar 2026100 served

S

Saint James SchoolHuman impact clear4.90 mg/LApr 2026200 served Saint Marys CollegeNatural background0.50 mg/LJan 20252,200 served City of SalisburyHealth-study range5.70 mg/LMay 202630,343 served Sam Hill EstatesHealth-study range7.70 mg/LJan 20251,036 served Sandy HookNatural background0.12 mg/LApr 2026220 served Scientists CliffsNatural background0.25 mg/LMar 20251,425 served Town of SecretaryNatural background0.50 mg/LApr 2026535 served Town of SharpsburgNatural background0.70 mg/LApr 20261,360 served Town of SharptownHealth-study range7.60 mg/LAug 2025625 served Sherwood Forest Water CompanyNatural background0.15 mg/LJan 20261,200 served Sherwood Forest/Forest View Village MhpNatural background0.50 mg/LMar 2026293 served Shores of CalvertNatural background0.15 mg/LApr 2026361 served Town of Smithsburg Distribution Systempurchased waterHuman impact likely1.02 mg/LMar 20262,500 served Town of Snow HillNatural background0.25 mg/LAug 20252,409 served SolomonsNatural background0.15 mg/LApr 20263,811 served Southern Region Allegany Distrib. Systempurchased waterNatural background0.13 mg/LDec 2025865 served SouthgateHuman impact likely1.00 mg/LFeb 2026188 served Southview WiseNatural background0.05 mg/LAug 202461 served Spring ValleyNatural background0.05 mg/LSep 202591 served Spring View Mobile Home ParkHuman impact likely2.48 mg/LApr 202670 served Springfield Hospital Distributionpurchased waterNatural background0.80 mg/LJan 20261,500 served St. Clements ShoresHuman impact likely1.00 mg/LMar 2026620 served St. LeonardNatural background0.15 mg/LApr 2026350 served St. Martins By The BayNatural background0.25 mg/LFeb 2025120 served Town of St. MichaelsNatural background0.25 mg/LJan 20252,650 served Steeplechase WaterworksNatural background0.25 mg/LJan 2025395 served Stella Marispurchased waterHuman impact likely1.12 mg/LJul 2025873 served StevensvilleNatural background0.50 mg/LJul 20259,155 served Stoney Chase/ Rock Creek M.H.P.SNatural background0.60 mg/LJan 2025396 served Town of SudlersvilleNatural background0.50 mg/LJun 2026497 served Sullivans Mobile Home Park CommunityHuman impact likely2.39 mg/LApr 202670 served Summerhill Mobile Home ParkNatural background0.50 mg/LMar 2026350 served Summit/HighlandsNatural background0.15 mg/LApr 20261,108 served SunnybrookHuman impact clear3.50 mg/LMay 2025416 served Sunset Lakes LlcNatural background0.25 mg/LJan 202548 served Swan Harbour Dell Mobile Home ParkHuman impact clear3.11 mg/LJan 2026500 served Swan PointNatural background0.05 mg/LMay 2026945 served Swann Haven Mobile Home ParkNatural background0.50 mg/LMay 202644 served

T

City of TaneytownHuman impact clear3.50 mg/LFeb 20266,750 served Tapestry NorthNatural background0.20 mg/LDec 202460 served Tara SubdivisionNatural background0.20 mg/LMay 202568 served Taylors Mobile Home ParkNatural background0.25 mg/LJan 202627 served Taylorsville Mhc, LlcHealth-study range5.15 mg/LApr 202638 served Tebbston On MagothyNatural background0.50 mg/LMar 202652 served Tenthouse Creek Community - AcdsNatural background0.50 mg/LJan 202623 served The Calverton SchoolNatural background0.25 mg/LJan 2026461 served The Neighborhoods At St. Elizabethpurchased waterHuman impact likely1.12 mg/LJul 2025162 served The ProvincesNatural background0.50 mg/LMar 20263,991 served Thunderbird ApartmentsNatural background0.25 mg/LJun 202540 served Thunderbird MotelNatural background0.15 mg/LJan 202660 served Town of ThurmontHuman impact clear3.20 mg/LFeb 20266,200 served Timber Grove MhpHuman impact likely2.45 mg/LFeb 202676 served Todd Village Mobile Home ParkHuman impact likely2.55 mg/LApr 2026180 served Tower Court Mobile Home ParkNatural background0.50 mg/LJan 202640 served Town & Country Mobile Home ParkNatural background0.90 mg/LJan 2025950 served Tranquility At Fredericktownepurchased waterHuman impact likely1.60 mg/LJun 2026105 served Town of TrappeNatural background0.50 mg/LAug 20251,200 served Trimac Water Company - Forest ParkNatural background0.25 mg/LMar 2026139 served Turkey Hill Water CompanyNatural background0.20 mg/LAug 2024150 served Twin Arch Mobile Home ParkHuman impact clear3.30 mg/LJan 202550 served Tylerton Waterwork CooperativeNatural background0.50 mg/LAug 2025100 served

U

U.S. Naval AcademyNatural background0.25 mg/LFeb 20258,700 served Town of Union BridgeHealth-study range5.69 mg/LApr 2026997 served

V

Town of ViennaNatural background0.25 mg/LJan 2025460 served Villages At LeonardtownHuman impact likely1.00 mg/LMar 2026239 served Villas At Cattail CreekHealth-study range6.50 mg/LApr 2026170 served

W

Wakefield ValleyHuman impact likely2.34 mg/LJan 20262,436 served Waldorf - Charles County DpwNatural background0.05 mg/LMay 202684,296 served Town of WalkersvilleHealth-study range9.94 mg/LMay 20268,440 served Walnut CreekNatural background0.20 mg/LMay 2025158 served Walstons Mobile Home ParkNatural background0.25 mg/LJan 2025165 served Washington Suburban Sanitary CommissionHuman impact likely1.15 mg/LMay 20261,900,000 served Watersidepurchased waterHuman impact likely1.60 mg/LJun 20261,509 served Waysons Mobile CourtNatural background0.25 mg/LFeb 2025540 served West Nottingham AcademyHuman impact clear3.34 mg/LMay 2026250 served West White PlainsNatural background0.25 mg/LMar 202650 served Western Region Allegany Distrib. Systempurchased waterNatural background0.59 mg/LJan 20264,955 served Western ShoresNatural background0.25 mg/LMar 2026200 served Town of WesternportNatural background0.34 mg/LJan 20262,200 served City of WestminsterHealth-study range5.31 mg/LJul 202635,256 served Westside Mobile Home ParkNatural background0.25 mg/LJan 2025300 served Whispering Pines Mobile Home ParkHuman impact likely1.90 mg/LJan 2025325 served White Oak Mobile Home ParkHuman impact likely1.60 mg/LMay 202532 served White Plains 1 Mhp/SmittysNatural background0.25 mg/LMar 2026100 served White Plains 2 Mhp/Jack BlairNatural background0.25 mg/LMar 202670 served White RockHuman impact clear4.70 mg/LApr 2026256 served White SandsNatural background0.15 mg/LApr 202682 served Whitley Park Condominiumspurchased waterHuman impact likely1.15 mg/LMay 2026256 served Wicomico ShoresHuman impact likely1.00 mg/LMar 20261,262 served Wild Goose Crest SubdivisionHuman impact likely1.00 mg/LMar 202665 served Wilderness RunHuman impact likely1.00 mg/LMar 2026511 served Town of WillardsNatural background0.25 mg/LAug 20251,021 served Williams Mobile Home ParkNatural background0.60 mg/LJan 202587 served Williams Mobile Home ParkNatural background0.25 mg/LJan 202535 served Town of Williamsport Distribution Systempurchased waterHuman impact likely1.02 mg/LMar 20262,400 served Woodbine Village Mobile Home ParkHuman impact clear4.53 mg/LApr 2026150 served Woodland Beach Community Assoc.Human impact clear4.10 mg/LJan 202526 served Woodland Trailer ParkAbove the federal limit10.80 mg/LApr 202665 served Woodlawn Mobile Home Park - NewHuman impact likely1.71 mg/LSep 2025134 served Woodlawn Mobile Home Park - OldHuman impact likely1.90 mg/LSep 202550 served Town of WoodsboroHuman impact clear3.00 mg/LMar 2024846 served WortonNatural background0.25 mg/LJan 2025955 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.