Louisiana tap water quality
899 active community water systems.
Largest water systems
| Grade | System | People | Health violations (5y) |
|---|
| A | Baton Rouge Water Company | 596,844 | 0 |
| B | Sewerage and Water Board of New Orleans (Carrollton) | 334,903 | 1 |
| A | E Jefferson WW District 1 | 275,163 | 0 |
| D | City of Shreveport Water System | 192,378 | 20 |
| A | Lafayette Utilities Water System | 169,389 | 0 |
| B | W Jefferson WW District 2 | 140,264 | 1 |
| A | Schriever Water Treatment Service Area | 116,460 | 0 |
| A | Lafourche Water District 1 | 81,609 | 0 |
| A | City of Bossier City Water System | 79,506 | 0 |
| A | City of Lake Charles Water System | 79,500 | 0 |
| A | Ward II Water District | 78,147 | 0 |
| D | Tangipahoa Parish Water District | 75,873 | 5 |
| A | City of Alexandria Water System | 66,798 | 0 |
| A | Lawco - New Iberia Water System | 59,928 | 0 |
| D | City of Monroe Water System | 57,000 | 4 |
| A | St Charles Parish Dept of Waterworks | 52,879 | 0 |
| D | New Orleans Algiers Water Works | 52,785 | 5 |
| A | St Bernard Parish Waterworks | 44,783 | 0 |
| B | City of Slidell Water Supply | 35,547 | 1 |
| A | St John Water District 3 | 31,965 | 0 |
| A | City of Zachary Water System | 31,569 | 0 |
| A | City of Natchitoches Water System | 26,910 | 0 |
| A | City of Denham Springs Water System | 25,725 | 0 |
| D | Village Water System | 24,813 | 19 |
| A | City of Sulphur Water System | 24,489 | 0 |
| D | Vermilion Waterworks District 1 | 24,132 | 7 |
| A | Beauregard Water Works Dist #3 | 24,000 | 0 |
| A | City of Ruston Water System | 22,468 | 0 |
| A | Assumption Parish WW District 1 | 21,366 | 0 |
| A | City of Hammond Water System | 21,135 | 0 |
| A | Calcasieu Parish WW District No 1 | 20,837 | 0 |
| D | City of Opelousas Water System | 20,388 | 6 |
| D | City of Pineville Water System | 20,358 | 16 |
| A | Rapides Parish Waterworks District 3 | 19,983 | 0 |
| A | Belle Chasse Water District | 19,644 | 0 |
| A | St Tam Parish- Bedico -Faubourg-Coquille | 18,372 | 0 |
| B | Bastrop Water System | 18,105 | 1 |
| A | Lawco - Crowley Water System | 17,634 | 0 |
| A | St Tam Parish - Briarwood Terrace | 17,536 | 0 |
| A | Gretna Waterworks | 17,026 | 0 |
| A | Lpwdn North Region | 16,833 | 0 |
| A | City of Gonzales Water System | 16,806 | 0 |
| C | Town of Blanchard Water System | 16,488 | 2 |
| A | City of Minden Water System | 16,281 | 0 |
| B | City of Covington Water Supply | 16,185 | 1 |
| D | City of West Monroe Water System | 16,005 | 5 |
| B | Town of Walker Water System | 15,813 | 1 |
| A | Lawco - Eunice Water System | 15,471 | 0 |
| A | Lpwd South | 15,132 | 0 |
| A | Thibodaux Waterworks | 14,862 | 0 |
Most issues (systems serving 10,000+)
D5 health-based violations in the last 5 years; 6 monitoring/reporting violations; 3 not yet resolved; PFAS tested (UCMR 5), none above federal limits; Lead 90th percentile below the action level (2025).
D12 health-based violations in the last 5 years; 4 monitoring/reporting violations; 12 not yet resolved; PFAS tested (UCMR 5), none above federal limits; Lead 90th percentile below the action level (2023).
D6 health-based violations in the last 5 years; 2 monitoring/reporting violations; PFAS tested (UCMR 5), none above federal limits; Lead 90th percentile below the action level (2023).
D24 health-based violations in the last 5 years; 2 monitoring/reporting violations; PFAS tested (UCMR 5), none above federal limits; Lead 90th percentile below the action level (2023).
D20 health-based violations in the last 5 years; 1 monitoring/reporting violation; PFAS tested (UCMR 5), none above federal limits; Lead 90th percentile below the action level (2025).
D5 health-based violations in the last 5 years; 1 monitoring/reporting violation; PFAS tested (UCMR 5), none above federal limits; Lead 90th percentile below the action level (2025).
D19 health-based violations in the last 5 years; 1 monitoring/reporting violation; 5 not yet resolved; PFAS tested (UCMR 5), none above federal limits; Lead 90th percentile below the action level (2025).
D7 health-based violations in the last 5 years; 1 monitoring/reporting violation; PFAS tested (UCMR 5), none above federal limits; Lead 90th percentile below the action level (2025).
D4 health-based violations in the last 5 years; 1 monitoring/reporting violation; 3 not yet resolved; PFAS tested (UCMR 5), none above federal limits; Lead 90th percentile below the action level (2023).
D5 health-based violations in the last 5 years; 1 monitoring/reporting violation; 1 not yet resolved; PFAS tested (UCMR 5), none above federal limits; Lead 90th percentile below the action level (2025).
D5 health-based violations in the last 5 years; 4 not yet resolved; PFAS tested (UCMR 5), none above federal limits; Lead 90th percentile below the action level (2025).
D4 health-based violations in the last 5 years; PFAS tested (UCMR 5), none above federal limits; Lead 90th percentile below the action level (2025).
D16 health-based violations in the last 5 years; 5 not yet resolved; PFAS tested (UCMR 5), none above federal limits; Lead 90th percentile below the action level (2023).
D5 health-based violations in the last 5 years; PFAS tested (UCMR 5), none above federal limits; Lead 90th percentile below the action level (2023).
D5 health-based violations in the last 5 years; PFAS tested (UCMR 5), none above federal limits; Lead 90th percentile below the action level (2023).
D4 health-based violations in the last 5 years; PFAS tested (UCMR 5), none above federal limits; Lead 90th percentile below the action level (2025).
C2 health-based violations in the last 5 years; 1 monitoring/reporting violation; PFAS tested (UCMR 5), none above federal limits; Lead 90th percentile below the action level (2024).
C2 health-based violations in the last 5 years; PFAS tested (UCMR 5), none above federal limits; Lead 90th percentile below the action level (2023).
B1 health-based violation in the last 5 years; 3 monitoring/reporting violations; PFAS tested (UCMR 5), none above federal limits; Lead 90th percentile below the action level (2025).
B1 health-based violation in the last 5 years; 2 monitoring/reporting violations; PFAS tested (UCMR 5), none above federal limits; Lead 90th percentile below the action level (2023).
Cities
AbbevilleAbita SpringsAddisAimwellAlbanyAlexandriaAmaAmeliaAmiteAnacocoAngieAngolaArabiArcadiaArchibaldArnaudvilleAthensAtlantaAvery IslandBakerBaldwinBallBaratariaBarksdale AfbBasileBaskinBastropBaton RougeBell CityBelle ChasseBelle RoseBentleyBentonBerniceBerwickBienvilleBlanchardBogalusaBonitaBordelonvilleBossier CityBourgBoutteBoyceBraithwaiteBranchBreaux BridgeBrittanyBroussardBruslyBunkieBushCadeCalhounCalvinCamptiCarencroCarvilleCastorCeciliaCenter PointCentervilleChalmetteCharentonChaseChataignierChathamChauvinCheneyvilleChoudrantChurch PointClarenceClaytonClintonCloutiervilleColfaxCollinstonColumbiaConventConverseCotton ValleyCottonportCoushattaCovingtonCreoleCrowleyCrowvilleCullenCut OffDarrowDelcambreDelhiDeltaDenham SpringsDequincyDeridderDes AllemandsDestrehanDevilleDodsonDonaldsonvilleDonnerDownsvilleDoylineDry CreekDry ProngDubachDubberlyDulacDuplessisDupontDusonEdgardEffieEganElizabethElm GroveElmerEltonEmpireEppsErathErosErwinvilleEstherwoodEthelEuniceEvangelineEvansFarmervilleFentonFerridayFlatwoodsFloraFlorienFlukerFolsomFordocheForest HillFort PolkFranklinFranklintonFrench SettlementFriersonGallianoGeismarGeorgetownGheensGibslandGibsonGilbertGilliamGlenmoraGlynnGolden MeadowGoldonnaGonzalesGramblingGramercyGrand CaneGrand CoteauGrand IsleGrayGraysonGreensburgGreenwell SpringsGreenwoodGretnaGrosse TeteGueydanHackberryHahnvilleHall SummitHamburgHammondHarrisonburgHarveyHaughtonHayesHaynesvilleHeflinHessmerHesterHinestonHodgeHoldenHomerHornbeckHosstonHoumaIdaIndependenceInnisIotaIowaJacksonJamestownJarreauJeaneretteJenaJenningsJonesboroJonesvilleKaplanKeatchieKeithvilleKellyKennerKentwoodKilbourneKinderKrotz SpringsLa PlaceLabadievilleLacassineLacombeLafayetteLafitteLake ArthurLake CharlesLake ProvidenceLakelandLaroseLawtellLecompteLeesvilleLenaLeonvilleLillieLisbonLivingstonLivoniaLockportLogansportLongvilleLorangerLoreauvilleLottieLulingLutcherMadisonvilleMamouMandevilleManghamMansfieldMansuraManyMaringouinMarionMarksvilleMarreroMarthavilleMathewsMaurepasMauriceMelvilleMer RougeMerauxMermentauMerryvilleMetairieMiltonMindenMonroeMontegutMontereyMontgomeryMooringsportMoraMoreauvilleMorgan CityMorganzaMorrowMorseMount HermonNapoleonvilleNatalbanyNatchezNatchitochesNew IberiaNew LlanoNew OrleansNew RoadsNew SarpyNewelltonNobleNorcoOak GroveOak RidgeOakdaleOberlinOil CityOllaOpelousasOscarOtisPaincourtvillePalmettoParadisPattersonPearl RiverPerryPierre PartPine GrovePine PrairiePinevillePioneerPitkinPlain DealingPlaqueminePlattenvillePlauchevillePleasant HillPollockPonchatoulaPort AllenPort BarrePort SulphurPowhatanPrairievillePridePrincetonProvencalQuitmanRacelandRagleyRayneRayvilleReddellReevesReserveRinggoldRoanokeRobelineRobertRodessaRosedaleRoselandRosepineRougonRustonSaint AmantSaint BenedictSaint BernardSaint FrancisvilleSaint GabrielSaint JamesSaint JosephSaint LandrySaint MartinvilleSaint RoseSalineSareptaSchrieverScottShongalooShreveportSibleySicily IslandSikesSimmesportSimpsonSimsboroSingerSlaughterSlidellSorrentoSpearsvilleSpringfieldSpringhillStarksStartSterlingtonStonewallSulphurSummerfieldSunSunsetSunshineSwartzTallulahTangipahoaTheriotThibodauxTickfawTransylvaniaTroutTullosTurkey CreekUraniaVacherieVentressVidaliaVille PlatteVintonVioletVivianWakefieldWalkerWashingtonWaterproofWatsonWelshWest MonroeWestlakeWestwegoWeyanokeWhite CastleWildsvilleWilsonWinnfieldWinnsboroWisnerWoodworthYoungsvilleZacharyZwolle