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Louisiana system directory

Find a community water system

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

591

systems with a current result

4,303,711

people served by them

1

system carrying a supplier result

1

system 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 591 of 591 systems

0-9

29 Palms Trailer ParkNatural background0.10 mg/LNov 202425 served

A

Alabama Water SystemNatural background0.20 mg/LJun 2024948 served Alberta Water SystemNatural background0.10 mg/LApr 20241,860 served City of Alexandria Water SystemHuman impact likely1.00 mg/LJan 202566,798 served Town of Amite Water SystemHuman impact likely1.30 mg/LApr 20244,300 served Village of AnacocoNatural background0.10 mg/LSep 20251,506 served Angie Water SupplyNatural background0.50 mg/LApr 2025400 served Archibald Water SystemHuman impact clear3.00 mg/LJul 20254,200 served Town of Arnaudville Water SystemNatural background0.30 mg/LAug 20253,957 served Ascension Consolidated Utility Dist 1Human impact likely1.20 mg/LFeb 20252,229 served Ascension Parish Water Works District 2Natural background0.40 mg/LNov 20251,353 served Assumption Parish Ww District 1Human impact likely1.20 mg/LFeb 202521,366 served Athens Water SystemNatural background0.20 mg/LJun 2024486 served Autumn Acres Mhp Water SystemNatural background0.20 mg/LMay 202490 served Avoyelles Parish Waterworks District 1Natural background0.10 mg/LSep 20243,900 served Avoyelles Ward 3 Waterworks DistrictNatural background0.20 mg/LJun 20242,619 served

B

Backwood Village Water SystemNatural background0.10 mg/LSep 2024783 served City of Baker Water SystemNatural background0.20 mg/LSep 202513,855 served Barksdale Afb Water SystemNatural background0.30 mg/LFeb 202513,000 served Barron Bayou EstatesNatural background0.10 mg/LOct 2025123 served Town of Basile Water SystemNatural background0.20 mg/LSep 20242,559 served Bastrop Water SystemHuman impact likely1.10 mg/LSep 202518,105 served Baton Rouge Water CompanyNatural background0.40 mg/LNov 2025596,844 served Bayou Bonne Idee WsNatural background0.30 mg/LMay 20251,656 served Bayou Des Cannes Water SystemNatural background0.20 mg/LSep 20244,578 served Bayou Macon Water SystemNatural background0.20 mg/LAug 20251,041 served Bayou Pierre Water SystemNatural background0.20 mg/LApr 20251,371 served Bayou Teche Water WorksNatural background0.20 mg/LJun 202410,137 served Bcc Detention Center WsNatural background0.20 mg/LFeb 2025150 served Bear Creek Water SystemNatural background0.10 mg/LJan 2025435 served Beauregard Water Works Dist #3Natural background0.50 mg/LJan 202524,000 served Belah Fellowship Water SystemNatural background0.50 mg/LMay 20251,806 served Bella Vista Mhp Water SystemNatural background0.20 mg/LMay 2024330 served Belle Chasse Water DistrictHuman impact likely1.00 mg/LFeb 202519,644 served Belle Place Trailer Park Water SystemHuman impact likely2.40 mg/LJun 2025330 served Bellevue Water SystemNatural background0.20 mg/LSep 20241,347 served Belmont Waterworks IncNatural background0.20 mg/LJun 20242,805 served Town of Benton Water SystemNatural background0.30 mg/LFeb 20258,037 served Bernice Water SystemNatural background0.10 mg/LSep 20241,863 served Town of BerwickNatural background0.10 mg/LFeb 20255,024 served Bienville Water SystemNatural background0.20 mg/LNov 2024360 served Bistineau Water SystemNatural background0.20 mg/LJul 2025882 served Black River Water SystemNatural background0.10 mg/LNov 20242,256 served Blocker Water SystemNatural background0.20 mg/LJun 20241,719 served Bob Community WaterworksNatural background0.30 mg/LJul 2025732 served City of Bogalusa Water SystemNatural background0.10 mg/LNov 202414,000 served Bogue-Lusa Water Works DistrictNatural background0.20 mg/LJun 20244,200 served Bonita Water SystemNatural background0.20 mg/LJun 2024426 served City of Bossier City Water SystemNatural background0.30 mg/LFeb 202578,960 served Town of Boyce Water SystemNatural background0.10 mg/LApr 20241,095 served City of Breaux Bridge Water SystemNatural background0.10 mg/LMar 20258,754 served City of Broussard Hwy 90 Water SystemNatural background0.20 mg/LJun 20254,182 served City of Broussard Purchase Water Systempurchased waterNatural background0.30 mg/LJul 202510,242 served Brownville Water SystemNatural background0.20 mg/LJun 20259,696 served Buckeye Water District 50Natural background0.20 mg/LJun 202512,078 served

C

C K B Trailer Park Water SystemNatural background0.10 mg/LApr 2024150 served Cajun Mobile Home Park Water SystemNatural background0.50 mg/LOct 2025168 served Calcasieu Parish Ww 12 Ward 3Natural background0.10 mg/LAug 20242,130 served Calcasieu Ww #14 Ward 5Natural background0.10 mg/LSep 20243,150 served Cameron Parish Water And Ww District 1Natural background0.10 mg/LJul 20241,798 served Cameron Parish Ww District 11 - Big LakeNatural background0.20 mg/LAug 20251,620 served Cameron Parish Ww District 11-Sweet LakeNatural background0.20 mg/LAug 20253,507 served Cameron Parish Ww District 2Natural background0.20 mg/LJul 2025926 served Campti Water SystemNatural background0.20 mg/LJun 20241,515 served Village of Cankton Water SystemNatural background0.20 mg/LJan 20252,730 served City of Carencro Water SystemNatural background0.10 mg/LApr 202411,301 served Carter PlantationNatural background0.20 mg/LAug 2024472 served Cash Point LandingNatural background0.20 mg/LFeb 2024225 served Castor Water SystemNatural background0.30 mg/LApr 2025435 served Cecilia Water CorporationNatural background0.20 mg/LJun 202512,249 served Central Grant Water SystemNatural background0.50 mg/LJun 20252,250 served Central Park SubdivisionNatural background0.30 mg/LApr 2025342 served Central Water SystemNatural background0.20 mg/LJul 2025558 served Chapman ApartmentsNatural background0.10 mg/LDec 202580 served Chatham Water SystemNatural background0.10 mg/LNov 20241,557 served Chee Chee Bay Water SystemNatural background0.10 mg/LNov 2024429 served Town of Cheneyville Water SystemNatural background0.10 mg/LDec 20231,531 served Cheniere Drew North Water SystemNatural background0.20 mg/LSep 202411,280 served Cheniere Drew South Water SystemNatural background0.70 mg/LSep 20241,563 served Chestnut-Readhimer Water SystemNatural background0.30 mg/LSep 2025564 served Choudrant Water SystemNatural background0.20 mg/LDec 20251,950 served Town of Church Point Water SystemNatural background0.20 mg/LAug 20254,176 served Clarence Water SystemNatural background0.10 mg/LFeb 2024642 served Town of Clayton Water SystemNatural background0.50 mg/LFeb 2025723 served Clearview Mobile Home ParkNatural background0.20 mg/LNov 2024141 served Town of ColfaxNatural background0.20 mg/LJun 20252,552 served Collinston Water SystemNatural background0.20 mg/LSep 2025609 served Concordia Waterworks District 1Natural background0.30 mg/LAug 20256,921 served Consolidated Waterworks District 2Natural background0.30 mg/LSep 20253,498 served Consolidated Wwks District 1 of BossierNatural background0.50 mg/LSep 20253,210 served Corbina Trailer Park Water SystemNatural background0.10 mg/LNov 202469 served Corney Water SystemNatural background0.20 mg/LJun 2025249 served Cotton Plant Water SystemNatural background0.10 mg/LMar 2024783 served Cotton Valley Water SystemNatural background0.10 mg/LApr 20241,380 served Country Pines South Subdivision WsNatural background0.10 mg/LApr 2024570 served Creston Water SystemNatural background0.10 mg/LDec 2024801 served Crowley Water System (Lawco)Natural background0.10 mg/LMar 202517,733 served Culbertson Water SystemNatural background0.20 mg/LJul 20253,300 served Cullen Water SystemNatural background0.10 mg/LSep 20241,236 served Cypress Black Bayou Water SystemNatural background0.30 mg/LFeb 20255,520 served Cypress Trace Manufactured Housing Comm.Natural background0.20 mg/LMay 2024140 served Cypress Village Mhp Water SystemHuman impact likely1.90 mg/LMar 2025396 served

D

Dalcour Waterworks DistrictHuman impact likely1.00 mg/LFeb 20251,248 served Darbonne Ws NorthNatural background0.10 mg/LNov 20243,186 served David Wade Correctional Center WsNatural background0.20 mg/LAug 20251,660 served Deepwoods Utilities IncNatural background0.20 mg/LAug 2025657 served Town of Delcambre Water SystemNatural background0.20 mg/LSep 20252,457 served Delhi Water SupplyNatural background0.20 mg/LAug 20254,071 served Delta Water SystemNatural background0.10 mg/LNov 2025369 served City of Denham Springs Water SystemNatural background0.20 mg/LAug 202525,725 served City of Deridder Water SystemNatural background0.40 mg/LJun 202514,400 served Desoto Parish Water Works District 1Natural background0.20 mg/LFeb 20257,173 served Diversion Water - ChinquapinNatural background0.20 mg/LJun 2025327 served Diversion Water - Cypress LakesNatural background0.20 mg/LMay 2024111 served Diversion Water - Montrose SubdivisionNatural background0.10 mg/LMar 2024591 served Diversion Water - Old Mill SettlementNatural background0.20 mg/LJun 2025246 served Diversion Water - River Run EstatesNatural background0.20 mg/LMay 202469 served Diversion Water River HighlandsNatural background0.20 mg/LJul 20251,356 served Dixie Overland Water SystemNatural background0.10 mg/LOct 20251,455 served Dixon Correctional InstituteNatural background0.10 mg/LNov 20251,700 served Dogwood South Water SystemNatural background0.50 mg/LJan 20252,304 served Doyline Waterworks District 1Natural background0.10 mg/LMar 2024969 served Village of Dry Prong Water SystemNatural background0.40 mg/LJun 20251,155 served Town of Duson Water SystemNatural background0.10 mg/LFeb 20242,190 served

E

E Jefferson Ww District 1Human impact likely1.00 mg/LJan 2025275,163 served Eagle Lake Mobile Home ParkNatural background0.10 mg/LAug 2024300 served East Carroll Ws SouthNatural background0.10 mg/LNov 20251,071 served East Central Vernon Water SystemNatural background0.20 mg/LAug 20246,363 served East Cross Water SystemNatural background0.20 mg/LDec 2025453 served East Iberville Water SystemNatural background0.40 mg/LNov 20256,657 served East Jena Water System Inc.Natural background0.20 mg/LNov 2025990 served East Park Subdivision Water SystemNatural background0.10 mg/LNov 2024102 served East Richland Ww DistrictNatural background0.20 mg/LAug 20252,835 served East Side Water SystemNatural background0.10 mg/LAug 20245,640 served Eastern Heights Water WorksNatural background0.20 mg/LMay 20241,782 served Ebarb Wwks Dist # 1 - Aimwell AreaNatural background0.10 mg/LFeb 20256,738 served Ebarb Wwks Dist # 1 - N Ebarb/BelmontNatural background0.20 mg/LJun 2024789 served Ebarb Wwks Dist #1 - MarshNatural background0.10 mg/LApr 202454 served Ebarb Wwks Dist #1 - North EbarbNatural background0.20 mg/LSep 20251,761 served Ebenezer Water SystemNatural background0.10 mg/LNov 2024828 served Edgefield Water SystemNatural background0.20 mg/LApr 2024375 served Edwards Millcreek Water SystemNatural background0.20 mg/LNov 2024114 served Egan Water CorporationNatural background0.20 mg/LJun 20245,358 served Egan Water Corporation No 2Natural background0.20 mg/LJun 20242,835 served Egret Landing Water SystemNatural background0.10 mg/LJan 202542 served Emc Water System IncNatural background0.30 mg/LJun 20253,135 served Epps Water SystemNatural background0.20 mg/LMay 2024594 served Town of Erath Water SystemNatural background0.10 mg/LNov 20242,985 served Village of Estherwood Water SystemNatural background0.20 mg/LJun 2024891 served Eunice Water System (Lawco)Natural background0.10 mg/LMar 202515,393 served Evangeline Ww District 1 - Pine PrairieNatural background0.20 mg/LJun 20242,598 served Evergreen Estates Water SystemNatural background0.20 mg/LMay 2024162 served Town of Evergreen Water SystemNatural background0.20 mg/LJun 20242,205 served

F

Farmerville Water SystemNatural background0.20 mg/LAug 20255,400 served Fellowship Water SystemNatural background0.20 mg/LJun 2025795 served Town of Ferriday Water SystemHuman impact likely1.70 mg/LMay 20253,816 served Fifth Ward Water SystemNatural background0.10 mg/LSep 20245,676 served Fiske Union Water SystemNatural background0.10 mg/LNov 20251,830 served Fluker Chapel Water WorksNatural background0.10 mg/LAug 2024296 served Folsom Water SupplyNatural background0.20 mg/LAug 20251,992 served Forest Glen SdNatural background0.20 mg/LNov 2024270 served Forest Hill UtilitiesNatural background0.10 mg/LMar 20253,600 served Village of Forest Water SystemNatural background0.20 mg/LJun 20241,560 served Fort Polk South Water SystemNatural background0.10 mg/LAug 202410,902 served Four Forks Water SystemNatural background0.20 mg/LAug 2025609 served Fourth Ward Water WorksNatural background0.20 mg/LJul 20254,839 served Franklin Water SupplyNatural background0.50 mg/LJan 20258,325 served Town of Franklinton Water SystemNatural background0.20 mg/LJul 20254,150 served

G

G & J Mobile Home Estates Water SystemHuman impact likely2.20 mg/LOct 2025186 served Gardner Community Water SystemNatural background0.10 mg/LAug 20244,566 served Village of Georgetown Water SupplyNatural background0.20 mg/LAug 2025363 served Gibsland Water SystemNatural background0.10 mg/LNov 2024979 served Gilark Water SystemNatural background0.20 mg/LSep 2025675 served Gilbert Water SystemHuman impact clear3.50 mg/LAug 2025915 served Gillis Long CenterNatural background0.40 mg/LNov 2025600 served Glencoe Community Water SystemNatural background0.10 mg/LOct 2025190 served Town of Glenmora Water SystemNatural background0.30 mg/LApr 20242,472 served Goodwill Water SystemNatural background0.40 mg/LFeb 20241,929 served Grambling State University WsNatural background0.10 mg/LSep 20256,000 served Grambling Water SystemNatural background0.20 mg/LApr 20244,949 served Gramercy WaterworksHuman impact likely1.10 mg/LFeb 20252,860 served Town of Grand Coteau Water SystemNatural background0.20 mg/LApr 20251,650 served Grayson Water SystemNatural background0.70 mg/LJun 20251,461 served Greater Ward 1 Waterworks DistrictNatural background0.20 mg/LJun 20243,333 served Greenbriar Prairie Basse Water SystemNatural background0.40 mg/LMar 20251,620 served Greensburg Water SystemNatural background0.20 mg/LJul 20241,340 served Town of Greenwood Water SystemNatural background0.10 mg/LFeb 20255,205 served Gretna WaterworksHuman impact likely1.10 mg/LFeb 202517,026 served

H

Hagewood Water SystemNatural background0.10 mg/LMay 20251,017 served Halfway-Carroll Water SystemNatural background0.20 mg/LJul 2025498 served Hall Summit Water SystemNatural background0.20 mg/LJul 2025756 served City of Hammond Water SystemNatural background0.10 mg/LJan 202421,135 served Happy Acres Mobile Home ParkHuman impact likely2.20 mg/LJun 2025120 served Village of Harrisonburg Water SystemNatural background0.20 mg/LAug 20241,530 served Town of Haughton Water SystemNatural background0.30 mg/LApr 20255,355 served Haynesville Water SystemNatural background0.20 mg/LApr 20253,600 served Hebert Water SystemHuman impact likely2.20 mg/LOct 20253,048 served Heflin Water SystemNatural background0.20 mg/LJul 2025504 served Henderson Nina Water System IncNatural background0.20 mg/LAug 20255,136 served Hico Water SystemNatural background0.80 mg/LAug 20251,530 served Hidden Hills Subdivision Water SystemNatural background0.30 mg/LJul 2025240 served Highway 1148 Water SystemNatural background0.10 mg/LMay 20251,086 served Hilly-Greenwood Water SystemNatural background0.20 mg/LJul 20251,476 served Hineston Water System, IncNatural background0.20 mg/LFeb 20251,089 served Holum Water SystemNatural background0.20 mg/LSep 20251,230 served Homer Water SystemNatural background0.60 mg/LMay 20244,524 served Horse Shoe Road Water SystemNatural background0.20 mg/LJul 2025270 served Village of Hosston Water SystemNatural background0.20 mg/LSep 2025729 served Houma Water Treatment Service AreaNatural background0.20 mg/LApr 202511,658 served

I

Iberia Water Works District 3 - CoteauNatural background0.30 mg/LMay 20258,775 served Ida Water SystemNatural background0.10 mg/LMay 2024495 served Ile Des Cannes Water SystemNatural background0.30 mg/LJul 20251,476 served Independence Water SystemNatural background0.20 mg/LJun 20253,052 served Indian Village Water SystemNatural background0.10 mg/LSep 20242,082 served Innis Water Corporation IncNatural background0.20 mg/LJun 20252,400 served Intracoastal Water System WestNatural background0.90 mg/LMar 20256,489 served Town of Iota Water SystemNatural background0.10 mg/LSep 20251,842 served

J

J E S T CNatural background0.10 mg/LNov 2025300 served Jamestown Fryeburg Water SystemNatural background0.50 mg/LNov 2024495 served Jeff Davis Central Waterworks DistrictNatural background0.10 mg/LAug 20245,709 served Jeff Davis Water And Sewer Commission 1Natural background0.20 mg/LJun 20249,780 served Jeff Davis Water District 4Natural background0.10 mg/LAug 20244,194 served Town of Jena Water SystemNatural background0.70 mg/LJun 20253,614 served Jenkins Community Water SystemNatural background0.10 mg/LNov 20241,026 served Jimmy Babin ApartmentsNatural background0.20 mg/LMay 202496 served Jims Trailer ParkNatural background0.20 mg/LJan 2024160 served Town of Jonesville Water SystemNatural background0.20 mg/LJun 20242,811 served Joyce Water SupplyNatural background0.70 mg/LSep 2024474 served Junction City Water SystemNatural background0.20 mg/LSep 2025708 served

K

City of Kaplan Water SystemNatural background0.80 mg/LSep 20254,340 served Keatchie Water SystemNatural background0.20 mg/LDec 20254,446 served Town of Kinder Water SystemNatural background0.10 mg/LSep 20243,195 served Kings Court Mhp Water SystemHuman impact likely1.20 mg/LMar 2025220 served Kiroli Darbonne WsNatural background0.20 mg/LJul 20259,210 served Kolin Ruby Wise Waterwork District 11 ANatural background0.10 mg/LNov 20254,992 served

L

Lacombe Nursing CentreNatural background0.20 mg/LAug 2024150 served Lafayette Mhp LlcNatural background0.90 mg/LOct 2025188 served Lafayette Utilities Water SystemNatural background0.30 mg/LJul 2025169,389 served Lafourche Water District 1Human impact likely1.00 mg/LApr 202581,609 served Lake Bruin Water District #1Natural background0.90 mg/LJan 20251,275 served City of Lake Charles Water SystemNatural background0.10 mg/LNov 202479,500 served Lakeview Estates Subd WsNatural background0.20 mg/LSep 2025120 served Lakeview Trailer Park Water SystemNatural background0.20 mg/LMay 202430 served Lasalle Waterworks District 1Natural background0.60 mg/LJun 20253,240 served Latanier Water AssociationHuman impact likely1.00 mg/LJan 2025357 served Lawtell Water Works District No 1Natural background0.10 mg/LApr 20243,741 served Lee Road Water CorporationNatural background0.10 mg/LDec 20256,048 served Leland Water System IncNatural background0.20 mg/LJul 20251,140 served Lena Water System IncNatural background0.20 mg/LJul 20253,540 served Town of Leonville Water SystemNatural background0.20 mg/LOct 20249,552 served Lewisburg Bellevue Water SystemNatural background0.20 mg/LJul 20258,226 served Liddieville Water SystemHealth-study range5.80 mg/LAug 20251,602 served Lincoln Parish Waterworks District #1Natural background0.20 mg/LJul 2025570 served Lincoln Parish Waterworks District #2Natural background0.40 mg/LDec 2025915 served Lincoln Parish Waterworks District #3Human impact likely1.30 mg/LMar 20252,730 served Linville-Haile Water SystemNatural background0.20 mg/LMay 20241,635 served Lisbon Water SystemNatural background0.20 mg/LJul 2025891 served Litroe Water SystemNatural background0.20 mg/LAug 2025369 served Logansport Water SystemNatural background0.20 mg/LFeb 20252,448 served Lpwd North Production FacilityNatural background0.80 mg/LMar 20254,122 served Lpwd SouthNatural background0.30 mg/LJul 202515,132 served Lpwdn Carmel DriveNatural background0.30 mg/LJul 2025576 served Lpwdn Fairway Village WsNatural background0.30 mg/LJul 2025339 served Lpwdn Guillot VillageNatural background0.30 mg/LJul 2025300 served Lpwdn Holiday Mobile Estates WsNatural background0.30 mg/LJul 2025426 served Lpwdn La Neuville Holiday Subdivision WsNatural background0.30 mg/LJul 20251,455 served Lpwdn North RegionNatural background0.30 mg/LJul 202516,833 served Lpwdn Purchase West ScottNatural background0.30 mg/LJul 20253,051 served Lpwdn South ParkNatural background0.30 mg/LJul 2025372 served Lpwdn South RegionNatural background0.30 mg/LJul 20254,032 served Lpwdn Township WsNatural background0.30 mg/LJul 202572 served Lpwdn Wilderness TrailNatural background0.30 mg/LJul 20251,644 served Lucky WaterworksNatural background0.80 mg/LSep 2025315 served Lutcher WaterworksHuman impact likely1.10 mg/LFeb 20254,781 served

M

Madisonville On The LakeNatural background0.20 mg/LJul 202551 served Magnolia - Barron Ridge SubdivisionNatural background0.20 mg/LMay 2024147 served Magnolia - Colworth PlaceNatural background0.20 mg/LJul 2025123 served Magnolia - EagleNatural background0.20 mg/LSep 20251,980 served Magnolia - Linda LaneNatural background0.20 mg/LMay 2024111 served Magnolia - Oaklawn TraceNatural background0.10 mg/LNov 2024480 served Magnolia - Plantation GardensNatural background0.40 mg/LNov 2025160 served Magnolia-Beau ParterreNatural background0.30 mg/LJul 2025462 served Magnolia-Belleville SubdivisionNatural background0.30 mg/LJul 2025282 served Magnolia-Brigas EstatesNatural background0.60 mg/LNov 2024294 served Magnolia-Brookhollow SubdivisionNatural background0.30 mg/LJul 2025165 served Magnolia-Carencro VillageNatural background0.30 mg/LJul 2025315 served Magnolia-Chartres Place SubdivisionNatural background0.30 mg/LJul 2025210 served Magnolia-Coach House ManorNatural background0.30 mg/LJul 2025315 served Magnolia-Cottages of AcadianaHuman impact likely1.70 mg/LSep 2025196 served Magnolia-Country PinesNatural background0.30 mg/LJul 2025117 served Magnolia-Eden IslesNatural background0.10 mg/LApr 202410,155 served Magnolia-Evangeline OaksNatural background0.10 mg/LApr 2024195 served Magnolia-Fox RunNatural background0.30 mg/LJul 2025189 served Magnolia-Grande PalmsNatural background0.40 mg/LSep 2025579 served Magnolia-Grande StakesNatural background0.30 mg/LJul 2025252 served Magnolia-Green Acres SubdivisionNatural background0.20 mg/LJun 20251,575 served Magnolia-Habersham SubdivisionNatural background0.30 mg/LJul 202554 served Magnolia-Highland RidgeNatural background0.10 mg/LOct 202480 served Magnolia-Homeland HeightNatural background0.10 mg/LSep 2024234 served Magnolia-I59 MhpNatural background0.20 mg/LJul 2024255 served Magnolia-Jackson SquareNatural background0.30 mg/LJul 2025825 served Magnolia-Jones Rolling RidgeNatural background0.20 mg/LAug 2025111 served Magnolia-Lake StreetNatural background0.20 mg/LNov 2024651 served Magnolia-Lakeshore EstatesNatural background0.10 mg/LOct 20254,146 served Magnolia-Lakeside EastNatural background0.20 mg/LJun 2024324 served Magnolia-Le Triomphe SubdivisionNatural background0.80 mg/LApr 20251,278 served Magnolia-Lexington HeightsHuman impact likely1.00 mg/LJan 2025192 served Magnolia-Markridge Park SubdivisionNatural background0.10 mg/LApr 2024468 served Magnolia-Ossun HeightsNatural background0.30 mg/LJul 2025393 served Magnolia-Peg Leg CoveNatural background0.20 mg/LFeb 2024189 served Magnolia-Penn Mill LakesNatural background0.20 mg/LJul 20251,152 served Magnolia-Pinnacle Place SubdivisionNatural background0.30 mg/LJul 2025132 served Magnolia-Port Louis TownhomesNatural background0.20 mg/LMay 2024200 served Magnolia-Resolve WhisperwoodNatural background0.20 mg/LAug 20256,867 served Magnolia-River ParkNatural background0.20 mg/LJul 2024822 served Magnolia-Shenandoah EstatesNatural background0.30 mg/LJul 2025396 served Magnolia-Southfield SquareNatural background0.30 mg/LJul 2025279 served Magnolia-Spring Creek SubdivisionNatural background0.20 mg/LJul 2025444 served Magnolia-The MeadowsNatural background0.20 mg/LAug 20244,701 served Magnolia-TrewhillNatural background0.30 mg/LJul 2025207 served Magnolia-Village Quest SubdivisionNatural background0.10 mg/LApr 2024186 served Magnolia-Western Utilities, IncNatural background0.10 mg/LSep 2024789 served Magnolia-Whippoorwill GroveNatural background0.50 mg/LNov 202478 served Magnolia-Windy MeadowsNatural background0.30 mg/LJul 2025549 served Mamou Road Water District, IncNatural background0.10 mg/LApr 20242,478 served Town of Mamou Water SystemNatural background0.20 mg/LSep 20254,559 served Mandeville Water SupplyNatural background0.10 mg/LApr 202413,000 served Manganos Mobile Home ParkNatural background0.10 mg/LAug 2024234 served Mangham Water SystemHuman impact likely1.40 mg/LOct 2025927 served Mansfield Water SystemNatural background0.10 mg/LFeb 20257,512 served Many SouthNatural background0.10 mg/LFeb 202551 served Many Water SystemNatural background0.10 mg/LFeb 20254,428 served Marina Del Ray Water SystemNatural background0.20 mg/LNov 2024500 served Town of MaringouinNatural background0.20 mg/LJun 20243,300 served Mcdonald Water SystemNatural background0.10 mg/LAug 2024675 served Mer Rouge Water SystemHuman impact likely1.20 mg/LFeb 20251,098 served Midway Water System IncNatural background0.20 mg/LApr 2025192 served Milton Purchase Water SystemNatural background0.30 mg/LJul 202511,625 served Milton Water SystemNatural background0.20 mg/LSep 20251,740 served Minden Water SystemHuman impact likely1.10 mg/LJul 202516,281 served Mineral Springs Water SystemNatural background0.20 mg/LJul 2025900 served Mire Branch Water CorporationNatural background0.10 mg/LApr 20249,480 served Mjs Estates Water SystemNatural background0.20 mg/LSep 202439 served Monroe Water SystemNatural background0.10 mg/LJan 202557,000 served Monticello Water SystemNatural background0.20 mg/LJun 20241,104 served Morehouse Central WsNatural background0.20 mg/LAug 2025780 served Morgan City Water SystemNatural background0.50 mg/LFeb 202512,703 served Morrow Water System IncNatural background0.90 mg/LMay 20251,572 served Mt Lebanon Water SystemNatural background0.10 mg/LAug 2024225 served Mt Moriah Water SystemNatural background0.20 mg/LJun 202478 served Mt Olive Water SystemNatural background0.20 mg/LAug 2024645 served Mt Olive Waterworks DistrictNatural background0.10 mg/LSep 2024900 served Mt Zion Water SystemNatural background0.10 mg/LMar 20251,635 served

N

Natchitoches Parish Wwks District 2Natural background0.20 mg/LJul 20248,415 served Natchitoches Water SystemNatural background0.10 mg/LFeb 202427,693 served New Carroll Water SystemNatural background0.30 mg/LFeb 20253,507 served New Iberia Water System (Lawco)Natural background0.20 mg/LMay 202559,928 served New Llano Water DepartmentNatural background0.10 mg/LNov 20233,300 served New Orleans Algiers Water WorksHuman impact likely1.40 mg/LMar 202452,785 served New Orleans Carrollton Water WorksHuman impact likely1.10 mg/LJan 2025334,903 served New Roads Water SystemNatural background0.20 mg/LMay 20259,024 served Newellton Water SystemNatural background0.50 mg/LJan 20251,100 served Noble Water SystemNatural background0.10 mg/LJan 2024549 served North Desoto Water SystemNatural background0.20 mg/LMar 20257,608 served North Franklin Water WorksHuman impact likely2.10 mg/LJan 20257,989 served Northwest Allen Parish Ww DistrictNatural background0.20 mg/LJun 20251,761 served Norton Shop Water SystemHuman impact likely1.10 mg/LMar 2024336 served Village of Norwood Water SystemNatural background0.20 mg/LJun 2024279 served

O

Oak Meadows Subdivision Water SystemNatural background0.20 mg/LAug 2025318 served Oak Pine Mobile Home Park Water SystemNatural background0.10 mg/LNov 2024240 served Oak Ridge Water SystemNatural background0.20 mg/LAug 2025369 served Oak Village Mobile Home Park WsNatural background0.10 mg/LMay 202487 served Old Saline Community Water SystemNatural background0.10 mg/LNov 2025390 served Town of Olla Water SystemNatural background0.20 mg/LMay 20242,565 served City of Opelousas Water SystemNatural background0.20 mg/LSep 202520,388 served

P

Palmetto Addiction RecoveryNatural background0.10 mg/LJan 202445 served Paradise Point Water SystemNatural background0.20 mg/LJun 2024159 served Parish Utilities of AscensionHuman impact likely1.00 mg/LMar 20259,732 served Parkland Trailer Park Water SystemNatural background0.60 mg/LMar 2025112 served Town of Pearl RiverNatural background0.10 mg/LSep 20253,333 served Pecan Island Ww District No 3Natural background0.10 mg/LAug 20241,230 served Pendleton Water AssociationNatural background0.10 mg/LFeb 20242,634 served Pharos Mobile Home Community SouthNatural background0.20 mg/LJul 2024222 served Pine Crest Trailer ParkNatural background0.10 mg/LOct 2024600 served Pine Prairie Correctional FacilityNatural background0.20 mg/LOct 2024900 served City of Pineville Water SystemNatural background0.30 mg/LApr 202520,358 served Pioneer Darnell Water SystemNatural background0.10 mg/LNov 20252,190 served Town of Plain Dealing Water SystemNatural background0.20 mg/LSep 20252,346 served Plaisance Water SystemNatural background0.40 mg/LAug 20256,375 served City of Plaquemine Water SystemNatural background0.10 mg/LMay 202514,043 served Town of Plaucheville Water SystemHuman impact likely1.20 mg/LApr 20254,233 served Pleasant Hill Water SystemNatural background0.20 mg/LJun 2024990 served Pleasant Hills-Crossroads Water SystemsNatural background0.10 mg/LOct 2024840 served Pleasant Ridge Water SystemNatural background0.70 mg/LJun 2025540 served Pleasant Valley Water SystemNatural background0.30 mg/LJul 20251,683 served Pointe A La Hache Water SystemHuman impact likely1.00 mg/LFeb 2025882 served Pointe Coupee Wwks District 2 - Hwy 10Natural background0.20 mg/LJul 20252,401 served Pointe Coupee Wwks District 2- BatchelorNatural background0.20 mg/LJul 20251,290 served Poland Water AssociationHuman impact likely1.00 mg/LJan 20251,044 served Pollock Area Water System IncNatural background0.20 mg/LAug 20253,900 served Town of Pollock Water SystemNatural background0.30 mg/LSep 20251,353 served Port Allen Water SystemNatural background0.10 mg/LOct 20246,759 served Town of Port Barre Water SystemNatural background0.20 mg/LSep 20253,828 served Port of West St MaryNatural background0.20 mg/LMay 2024400 served Port Sulphur Water DistrictHuman impact likely1.00 mg/LMay 202510,308 served Prairie Ronde Water System IncNatural background0.20 mg/LSep 20256,090 served

R

R & D Properties Mobile Home ParkNatural background0.60 mg/LMar 202542 served Rambin-Wallace Water SystemNatural background0.20 mg/LJul 20251,161 served Rapides Island Water Association IncNatural background0.20 mg/LJun 20245,658 served Rapides Parish Waterworks District 3Natural background0.30 mg/LJul 202519,983 served City of Rayne Water SystemNatural background0.20 mg/LJul 20247,722 served Rayville Water SystemNatural background0.60 mg/LFeb 20254,842 served Red Hill Waterworks Inc.Natural background0.20 mg/LAug 20251,914 served Richland Heights Subd Water SystemNatural background0.70 mg/LJul 202530 served Village of Ridgecrest Water SupplyHuman impact likely1.70 mg/LMay 2025684 served Ringgold Water SystemHuman impact likely1.70 mg/LMay 20252,283 served Riser Road Water SystemNatural background0.40 mg/LDec 2025198 served River Pines Plantation UtilitiesNatural background0.10 mg/LAug 2024300 served River Road Water SystemNatural background0.20 mg/LOct 20253,510 served Roddy Road Village Ascension, LlcNatural background0.10 mg/LMay 2024120 served Rodessa Water SystemNatural background0.20 mg/LMay 2024312 served Rogers Community Water System IncNatural background0.20 mg/LJun 2025495 served Ron Son BearNatural background0.40 mg/LJul 202596 served Town of Rosepine Water SystemNatural background0.20 mg/LJun 20252,427 served Royal Mobile Estates Water SystemNatural background0.20 mg/LSep 2025141 served Ruston Water SystemNatural background0.40 mg/LDec 202522,468 served

S

Sabine Parish Water District 1Natural background0.10 mg/LAug 20246,924 served Salem Water SystemNatural background0.20 mg/LSep 2025753 served Saline Water SystemNatural background0.60 mg/LNov 2025429 served Sandstone Lake Water SupplyNatural background0.10 mg/LNov 202425 served Sandy Hill Water & SewerNatural background0.20 mg/LJun 2025600 served Sandy Point 480 Water SystemNatural background0.20 mg/LFeb 2025654 served Sardis Water SystemNatural background0.20 mg/LAug 20251,404 served Savoy Swords Water System IncNatural background0.20 mg/LApr 20247,326 served Schriever Water Treatment Service AreaNatural background0.80 mg/LApr 2025116,460 served City of Scott Water SystemNatural background0.30 mg/LJul 20259,696 served Shongaloo Water SystemNatural background0.20 mg/LSep 20252,196 served Sibley Water SystemNatural background0.20 mg/LJul 20252,373 served Simsboro Water SystemNatural background0.20 mg/LJun 20241,083 served Town of Slaughter Water SystemNatural background0.20 mg/LJun 20251,920 served Slidell Water SupplyNatural background0.30 mg/LApr 202535,547 served Sligo Water System IncorporatedHuman impact likely1.10 mg/LAug 20252,850 served Smith Mobile Home Village Water SystemNatural background0.50 mg/LDec 2023444 served Social Springs Water System NorthNatural background0.20 mg/LJul 2025744 served Social Springs Water System SouthNatural background0.20 mg/LJul 2025576 served South Bossier Water SystemNatural background0.20 mg/LAug 20251,755 served South Claiborne Water SystemNatural background0.20 mg/LJun 20243,843 served South Grant Water CorporationNatural background0.30 mg/LOct 20255,289 served South Mansfield Water SystemNatural background0.10 mg/LMar 2025933 served South Monroe Ws GowcNatural background0.10 mg/LAug 20247,335 served South Oakdale Water SystemNatural background0.20 mg/LJul 20251,434 served South Rayne Water CorporationNatural background0.10 mg/LSep 20254,254 served South Shreveport Mobile VillaNatural background0.60 mg/LMay 202475 served South Toledo Bend Water DistrictNatural background0.20 mg/LFeb 20245,943 served Southeast Bienville Water SystemNatural background0.10 mg/LNov 2024348 served Southeast Grant Water SystemNatural background0.50 mg/LJun 2025567 served Southwest Allen Ww District No 2Natural background0.10 mg/LSep 20248,106 served Southwest Ouachita Waterworks, IncNatural background0.10 mg/LNov 202410,725 served Spicewood Mobile Home Park Water SystemNatural background0.20 mg/LJun 202542 served Spillway Estates Water SystemNatural background0.20 mg/LJul 2025342 served Springfield Mobile Home ParkNatural background0.20 mg/LOct 202463 served Springhill Community Water SystemNatural background0.20 mg/LMay 2024183 served Springhill Water SystemNatural background0.20 mg/LJul 20257,800 served St Bernard Parish WaterworksHuman impact likely1.00 mg/LFeb 202544,783 served St Charles Mobile Home ParkNatural background0.10 mg/LMay 2025175 served St Charles Parish Dept of WaterworksNatural background0.80 mg/LMar 202552,879 served Town of St Francisville Water SystemNatural background0.20 mg/LNov 20252,304 served St James Water District 1Human impact likely1.10 mg/LFeb 20257,200 served St James Water District 2Natural background0.80 mg/LMar 20257,513 served St James Water SystemHuman impact likely1.20 mg/LMar 2025360 served St John Water District 1Natural background0.80 mg/LMar 202510,484 served St John Water District 2Natural background0.80 mg/LMar 20253,702 served St John Water District 3Natural background0.10 mg/LNov 202431,965 served St Joseph AbbeyNatural background0.20 mg/LOct 2024127 served St Joseph Water SystemNatural background0.90 mg/LJan 20251,332 served St Landry Water Works District 2 RuralNatural background0.20 mg/LJul 20254,761 served St Landry Wwd 3 Port Barre Area ANatural background0.20 mg/LSep 2025270 served St Landry Wwd 3 Port Barre Area BNatural background0.20 mg/LSep 2025516 served St Landry Wwd 3 Port Barre Area CNatural background0.20 mg/LSep 2025351 served St Landry Wwd 3 Port Barre Area DNatural background0.20 mg/LSep 20251,860 served St Martin Industrial Park Water SystemHuman impact likely1.00 mg/LApr 2025150 served St Martin Water And Sewer Commission 1Natural background0.50 mg/LFeb 20252,262 served St Martin Water District 4 - CatahoulaHuman impact likely1.00 mg/LApr 20253,000 served St Martin Water Works District 3 - CadeNatural background0.80 mg/LApr 20253,249 served City of St Martinville Water SystemHuman impact likely2.20 mg/LMay 20247,575 served St Mary Par Jt Water Sewer Commission 5Natural background0.10 mg/LOct 20251,240 served St Mary Parish W&S #2 Bayou VistaNatural background0.10 mg/LFeb 20255,379 served St Mary Parish Water Sewerage Comm 1Natural background0.20 mg/LFeb 20252,823 served St Mary Water & Sewer Comm #3Natural background0.30 mg/LJan 20257,500 served St Tam Parish - Abita LakesNatural background0.20 mg/LOct 2024609 served St Tam Parish - Cross Gates SdNatural background0.70 mg/LJan 20258,037 served St Tam Parish - River OaksNatural background0.20 mg/LApr 2025933 served St Tam Parish - St GertrudeNatural background0.20 mg/LOct 202472 served St Tam Parish - TamanendNatural background0.30 mg/LApr 2025125 served St Tam Parish -Northridge EstatesNatural background0.10 mg/LOct 20241,653 served St Tam Parish Salvation Manor St JoeNatural background0.30 mg/LOct 2024171 served St Tam Parish- Bedico -Faubourg-CoquilleNatural background0.20 mg/LOct 202418,372 served St Tam Parish- Ben Thomas RdNatural background0.20 mg/LApr 2025220 served St Tammany Water District 3Natural background0.10 mg/LSep 20242,920 served Start Water SystemHuman impact likely1.70 mg/LOct 20252,514 served Sulphur City of Water SystemNatural background0.10 mg/LNov 202424,489 served Summerfield Water SystemNatural background0.20 mg/LAug 20251,329 served Summerville Water SystemNatural background0.40 mg/LMay 20251,425 served Sun Water SupplyNatural background0.10 mg/LOct 2024726 served Town of Sunset Water SystemNatural background0.70 mg/LMar 20254,356 served

T

Tallulah Water SystemNatural background0.40 mg/LJan 20258,601 served Tangipahoa (Second Ward) Water DistrictNatural background0.20 mg/LAug 20244,112 served Tangipahoa Parish Water DistrictNatural background0.20 mg/LNov 202572,504 served Village of Tangipahoa Water SystemNatural background0.10 mg/LAug 2024748 served Tannehill Water SystemNatural background0.30 mg/LSep 20251,932 served Tchefuncta Club EstatesNatural background0.10 mg/LOct 20241,245 served Te Mamou Water DistrictNatural background0.10 mg/LApr 20242,259 served Tensas Water District AssociationNatural background0.40 mg/LJan 20253,843 served The Charleston Mhc Water SystemNatural background0.20 mg/LNov 2024567 served The Reserve Mhc Water SystemNatural background0.10 mg/LNov 2024159 served Thibodaux WaterworksHuman impact likely1.10 mg/LFeb 202514,862 served Tickfaw Water SystemNatural background0.20 mg/LMay 2024764 served Timberland Mobile Home ParkNatural background0.10 mg/LNov 202560 served Town & Country ServiceNatural background0.10 mg/LJan 20255,715 served Tremont Water DistrictNatural background0.20 mg/LDec 2024510 served Tri-Water SystemNatural background0.10 mg/LMar 20251,302 served Village of Turkey Creek Water SystemNatural background0.20 mg/LAug 20255,289 served Turkey Creek Water SystemHuman impact likely1.30 mg/LJan 20253,429 served

U

Union Grove Water SystemNatural background0.20 mg/LJun 2024456 served Union Springs Water SystemNatural background0.20 mg/LAug 20241,260 served United Water SystemNatural background0.20 mg/LSep 20254,446 served Town of Urania Water SystemNatural background0.20 mg/LMay 2024784 served Utilities Inc - French SettlementNatural background0.20 mg/LAug 20252,313 served Utilities Inc - Green Brier Water SupplyNatural background0.20 mg/LJul 20252,250 served Utilities Inc - Hammond HeightsNatural background0.20 mg/LJul 20244,281 served Utilities Inc - Huntwyck VillageNatural background0.10 mg/LOct 20252,088 served Utilities Inc - Magnolia Forest SubdNatural background0.20 mg/LJul 20251,635 served Utilities Inc - North Folsom HillsNatural background0.20 mg/LOct 202481 served Utilities Inc - North Park Water SupplyNatural background0.10 mg/LOct 202411,298 served Utilities Inc - Oakmont SubdNatural background0.20 mg/LJun 2024612 served Utilities Inc - OakridgeNatural background0.20 mg/LAug 2025123 served Utilities Inc - Quail Ridge SubdivisionNatural background0.20 mg/LAug 20251,563 served Utilities Inc - VelmaNatural background0.20 mg/LAug 20251,302 served Utilities Inc - Woodridge SubdivisionNatural background0.20 mg/LJul 20251,590 served Utilities Inc -BankstonHuman impact likely1.30 mg/LApr 2024120 served Utilities Inc- Springfield AreaHuman impact likely2.20 mg/LAug 20251,914 served Utilities Inc- Whitehall/ Head of IslandNatural background0.20 mg/LAug 20252,676 served

V

Varnado Water WorksNatural background0.40 mg/LNov 20244,230 served Vermilion Waterworks District 1Natural background0.40 mg/LMay 202424,132 served Vernon Parish Water And Sewer CommissionNatural background0.20 mg/LJun 20255,295 served Veterans AdministrationNatural background0.10 mg/LMar 20251,330 served Village Water SystemHuman impact likely1.90 mg/LMar 202510,890 served Villages of Bocage- MadisonvilleNatural background0.20 mg/LNov 2025894 served City of Ville Platte Water SystemNatural background0.20 mg/LJun 20246,590 served Vixen Water SystemNatural background0.20 mg/LJun 2025774 served

W

W Jefferson Ww District 2Human impact likely1.10 mg/LFeb 2025140,264 served Walker Community SystemNatural background0.20 mg/LJun 2024417 served Walnut Bayou Water AssociationNatural background0.30 mg/LApr 20253,531 served Ward 3 Water AssociationNatural background0.40 mg/LAug 20251,662 served Ward 5 Waterworks District 1 - Lone PineNatural background0.10 mg/LAug 2024711 served Ward Ii Water DistrictNatural background0.20 mg/LJun 202473,506 served Ward Nine Water SystemNatural background0.20 mg/LAug 2025489 served Wards 4 & 5 Water SystemNatural background0.20 mg/LJun 20251,002 served Wards Chapel Water SystemNatural background0.20 mg/LMay 20241,620 served Town of Washington Water SystemNatural background0.10 mg/LNov 20241,713 served Water & Sewer Commission 4 of St MaryNatural background0.10 mg/LJan 20249,709 served Waterproof Water SystemNatural background0.40 mg/LJan 2025786 served Waterworks 1 of Morehouse, IncHuman impact likely1.00 mg/LJun 20251,266 served Waterworks Dist. No. 10 of Ward 7Natural background0.10 mg/LSep 2024942 served Waterworks District 7Natural background0.20 mg/LAug 20255,817 served Wbr District 4 - ArbrothNatural background0.20 mg/LMar 2025555 served Wbr District 4 -Section Road WintervilleNatural background0.20 mg/LMar 20255,571 served Wbr Public UtilitiesNatural background0.20 mg/LMay 20244,329 served Wesley Chapel Water SystemNatural background0.20 mg/LJun 20244,080 served West Feliciana Consol Wwks District 13Natural background0.30 mg/LOct 202512,045 served West Grant Water AssociationNatural background0.20 mg/LJun 20253,324 served West Hwy 80 Ark Road WsNatural background0.20 mg/LJul 202514,649 served West Monroe Water SystemNatural background0.40 mg/LJun 202516,005 served West Sterlington Water SystemNatural background0.10 mg/LNov 20241,095 served West Winn Water System IncNatural background0.10 mg/LApr 20242,064 served West Winnsboro Water SystemHuman impact clear3.50 mg/LAug 20253,078 served Westwego WaterworksHuman impact likely1.10 mg/LFeb 20258,534 served Wheeling Water System IncNatural background0.90 mg/LMar 2025381 served Whitehall Water System IncNatural background0.10 mg/LOct 2025627 served Willa Villa Mobile HomeNatural background0.10 mg/LOct 2025161 served City of Winnfield Water SystemNatural background0.20 mg/LMay 20247,194 served Winnsboro Water SystemHuman impact likely1.50 mg/LOct 20257,518 served Wisner Water SystemNatural background0.50 mg/LJul 20251,221 served Woodside MhpNatural background0.70 mg/LApr 2025150 served Wwks District 2 of St HelenaNatural background0.20 mg/LJun 20258,772 served

Y

Youngs Community Llc. Water SystemNatural background0.70 mg/LOct 2025144 served City of Youngsville Purchase WsNatural background0.70 mg/LNov 20248,886 served City of Youngsville Water SystemNatural background0.30 mg/LApr 20259,915 served

Z

Zachary Water SystemNatural background0.40 mg/LOct 202531,569 served Zone 2 Water System Inc.Natural background0.20 mg/LJun 20251,344 served Town of Zwolle Water SystemNatural background0.10 mg/LAug 20242,520 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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