Water Hardness in Louisiana
Average: 91 PPMSlightly Hard441 cities917 water systems
State report
Is Louisiana Water Hard or Soft?
Louisiana water is slightly hard on average at 91 PPM (5.3 GPG). Local readings can vary by utility, aquifer, treatment plant, and private well use.
State average
91 PPM
Slightly Hard
Local coverage
441 cities
917 water systems
Source profile
435 ZIPs
direct or USGS-backed
85% of covered ZIPs use treated-water records or USGS monitoring, so the state report has relatively strong source support.
State data profile
How to read the Louisiana results
State pages are screening and comparison hubs. They summarize ZIP, city, and water-system patterns so you can find the local page that best matches your home or utility.
Direct or USGS-backed ZIPs
435 of 510
85% use treated-water records or USGS monitoring.
Estimated ZIP values
75 ZIPs
15% use nearby, county, or state-level fallback values.
Dataset update
March 9, 2026
Source coverage and rollups are rebuilt from the public dataset.
Use the source coverage below to judge how much local confirmation a specific city or ZIP needs. The methodology page explains the source hierarchy, weighting, and limitations.
State Average
91 PPM
Slightly Hard
Coverage
441 cities
917 water systems in the state rollup.
Data Source Coverage
ZIP-level source mix for Louisiana; higher direct and USGS coverage means less reliance on regional estimates.
510 ZIPs covered
Verified treated water
Utility, CCR, or state treated-water records
28%
142 ZIPs
High-confidence USGS
Environmental monitoring matched to local systems
57%
293 ZIPs
Estimated
Nearby, county, or state-level fallback values
15%
75 ZIPs
In Louisiana, 28% of ZIPs use verified treated-water records, 57% use high-confidence USGS monitoring, and 15% use estimates that should be confirmed locally for treatment decisions.
What the Data Shows in Louisiana
Most classified ZIPs in Louisiana are below the hard-water threshold, though local systems can still vary.
Louisiana is mostly supported by high-confidence USGS monitoring, which is useful for regional hardness patterns and should be interpreted as environmental monitoring rather than a direct treated tap-water report for every home.
Use the city table below to compare local results. For estimated locations or unusually high readings, confirm with your utility or a home hardness test before sizing treatment equipment.
ZIP Hardness Distribution
Soft57% (291)
Slightly Hard16% (82)
Moderately Hard15% (74)
Hard4% (20)
Very Hard8% (43)
Treatment Takeaway
Hardness treatment is less likely to be needed statewide, but local water systems can still differ from the state pattern. Test first if you see scale or spotting.
How to Use This Data
The source coverage is relatively strong in Louisiana, so these pages are useful for comparing local patterns before confirming your home's exact hardness.
Source-Backed Water Systems in Louisiana
Large systems with treated-water reports or USGS monitoring behind the state rollup.
| Water system | Hardness | Source label | Population |
|---|---|---|---|
| Baton Rouge Water Company LA1033005 - East Baton Rouge Parish County | 120 PPM Moderately Hard | Annual Water Quality Report Verified - Annual Water Quality Report | 596,844 |
| New Orleans Carrollton Water Works LA1071009 - Orleans Parish County | 110 PPM Slightly Hard | Annual Water Quality Report Verified - Annual Water Quality Report | 334,903 |
| E Jefferson Ww District 1 LA1051001 - Jefferson Parish County | 110 PPM Slightly Hard | Annual Water Quality Report Verified - Annual Water Quality Report | 275,163 |
| Shreveport Water System LA1017031 - Caddo Parish County | 40 PPM Soft | Annual Water Quality Report Verified - Annual Water Quality Report | 192,378 |
| Lafayette Utilities Water System LA1055017 - Lafayette Parish County | 80 PPM Slightly Hard | Annual Water Quality Report Verified - Annual Water Quality Report | 169,389 |
| W Jefferson Ww District 2 LA1051004 - Jefferson Parish County | 110 PPM Slightly Hard | Annual Water Quality Report Verified - Annual Water Quality Report | 140,264 |
| City Of Lake Charles Water System LA1019029 - Calcasieu Parish County | 50 PPM Soft | Annual Water Quality Report Verified - Annual Water Quality Report | 79,500 |
| City Of Bossier City Water System LA1015004 - Bossier Parish County | 40 PPM Soft | Annual Water Quality Report Verified - Annual Water Quality Report | 78,960 |
Useful Louisiana City Pages
Shortcuts to city pages backed by more ZIP-code or water-system data.
Cities With More Local Data
Prioritize cities with multiple ZIPs and systems, then use the local source badges to compare high-confidence USGS readings against estimated areas.
Top 10 Hardest Water Cities
| # | City | Hardness |
|---|---|---|
| 1 | Marksville | Very Hard (259 PPM) |
| 2 | Saint Martinvill | Very Hard (259 PPM) |
| 3 | Ville Platte | Very Hard (259 PPM) |
| 4 | Kaplan | Hard (241 PPM) |
| 5 | Jonesboro | Hard (231 PPM) |
| 6 | Henderson | Hard (186 PPM) |
| 7 | White Castle | Moderately Hard (152 PPM) |
| 8 | Iberville | Moderately Hard (148 PPM) |
| 9 | Plaquemine | Moderately Hard (148 PPM) |
| 10 | Sunshine | Moderately Hard (148 PPM) |
Top 10 Softest Water Cities
| # | City | Hardness |
|---|---|---|
| 1 | Jena | Soft (1 PPM) |
| 2 | Dubach | Soft (2 PPM) |
| 3 | Grambling | Soft (3 PPM) |
| 4 | Ruston | Soft (3 PPM) |
| 5 | Simsboro | Soft (3 PPM) |
| 6 | Port Allen | Soft (4 PPM) |
| 7 | New Roads | Soft (4 PPM) |
| 8 | Franklinton | Soft (6 PPM) |
| 9 | Mandeville | Soft (7 PPM) |
| 10 | Abita Springs | Soft (7 PPM) |
All Cities in Louisiana
City pages marked Estimated use fallback values and should be confirmed with local testing or utility data.
Abita SpringsSoftAcmeModerately HardAddisSoftAimwellModerately HardAlbanySoftAlexandriaSoftAltoHardAmaVery HardAmiteSoftAnacocoSoftAngieSoftAngolaSoftArabiVery HardArcadiaSlightly HardArchibaldModerately HardArnaudvilleSlightly HardAshlandSoftAthensSoftAtlantaSoftAvery IslandHardBainsSoftBakerModerately HardBaldwinModerately HardBaratariaSlightly HardBarksdale A F BSoftBasileVery HardBaskinVery HardBastropSoftBatchelorSoftBaton RougeModerately HardBelcherSoftBell CitySoftBelle ChasseModerately HardBelle RoseModerately HardBelmontSoftBentleySoftBentonSoftBerniceSoftBerwickModerately HardBethanySoftBienvilleSoftBlanchardSoftBogalusaSoftBonitaSoftBoothvilleModerately HardBordelonvilleModerately HardBossier CitySoftBourgSlightly HardBoutteVery HardBoyceSoftBraithwaiteModerately HardBranchModerately HardBridge CitySlightly HardBroussardSlightly HardBruslySoftBuckeyeSoftBurasModerately HardBushSoftCalcasieuSoftCalhounSoftCalvinSoftCameronVery HardCamptiSoftCanktonSlightly HardCarencroSlightly HardCaspianaSoftCastorSoftCenter PointVery HardChalmetteVery HardCharentonModerately HardChataignierSoftChathamSoftChauvinSlightly HardCheneyvilleSoftChestnutSoftChopinSoftChoudrantSoftChurch PointHardClarenceSoftClarksSoftClaytonSoftCliftonSoftClintonSoftColfaxSoftCollinstonSoftConventVery HardCotton ValleySoftCottonportVery HardCovingtonSoftCreoleModerately HardCrowleyModerately HardCullenSoftCut OffSoftDarrowSoftDelcambreHardDequincySoftDeridderSoftDerrySoftDes AllemandsVery HardDixieSoftDodsonSoftDonaldsonvilleSoftDownsvilleSoftDoylineSoftDry CreekSoftDry ProngSoftDubachSoftDubberlySoftDulacSlightly HardDusonSlightly HardEchoSoftEdgardSoftEganModerately HardElizabethSoftElm GroveSoftElmerSoftEltonSoftEmpireModerately HardEnterpriseModerately HardEolaVery HardEppsHardErathHardErosSoftErwinvilleSoftEstherwoodModerately HardEthelSoftEuniceModerately HardEvangelineModerately HardEvansSoftFarmervilleSoftFentonSoftFieldsSoftFisherSoftFlatwoodsSoftFlorienSoftFlukerSoftFolsomSoftForbingSoftFordocheSoftForest HillSoftForked IslandHardFort NecessityVery HardFort PolkSoftFranklinModerately HardFranklintonSoftFrench SettlemenSoftFriersonSoftFrogmoreSoftGallianoSoftGalvezSoftGaryvilleSoftGeismarSoftGeorgetownSoftGheensSoftGibslandSlightly HardGibsonSlightly HardGilbertModerately HardGilliamSoftGlosterSoftGlynnSoftGolden MeadowSoftGoldonnaSoftGonzalesSoftGorumSoftGoudeauVery HardGramblingSoftGramercyVery HardGrand CaneSoftGrand ChenierSoftGrand CoteauSlightly HardGrand IsleSlightly HardGrantSoftGraySlightly HardGraysonSoftGreensburgSoftGreenwell SpringSlightly HardGreenwoodSlightly HardGretnaSlightly HardGrosse TeteModerately HardGueydanHardHackberryModerately HardHahnvilleVery HardHall SummitSoftHamburgVery HardHammondSoftHannaSoftHarahanSlightly HardHarrisonburgSlightly HardHarveySlightly HardHaughtonSoftHayesSoftHaynesvilleSoftHebertSoftHeflinSoftHendersonHardHessmerSlightly HardHesterSlightly HardHicksSoftHodgeHardHoldenSoftHomerSoftHornbeckSoftHosstonSoftHoumaSlightly HardHusserSoftIbervilleModerately HardIdaSoftIndependenceSoftInnisSoftIotaModerately HardIowaSoftJamestownSoftJarreauSoftJeaneretteHardJeffersonSlightly HardJenaSoftJenningsModerately HardJonesSoftJonesboroHardKaplanHardKeatchieSoftKeithvilleSoftKellySoftKennerSlightly HardKentwoodSoftKilbourneVery HardKinderSoftKolinSoftKrotz SpringsSlightly HardLa PlaceSoftLabadievilleModerately HardLacassineSoftLacombeSoftLafayetteSlightly HardLafitteSlightly HardLake ArthurModerately HardLake CharlesSoftLake ProvidenceVery HardLakelandSoftLaroseSoftLartoVery HardLawtellModerately HardLe MoyenSlightly HardLeanderSoftLeblancSoftLecompteSoftLettsworthSoftLillieSoftLinvilleSoftLisbonSoftLivingstonSoftLivoniaSoftLockportSoftLogansportSoftLongvilleSoftLorangerSoftLoreauvilleHardLottieSoftLulingVery HardLutcherVery HardMadisonvilleSoftMamouVery HardMandevilleSoftManghamSlightly HardMansfieldSoftMansuraVery HardManySoftMarksvilleVery HardMarreroSlightly HardMarthavilleSoftMathewsSoftMaurepasSoftMauriceHardMelroseSoftMelvilleSlightly HardMer RougeSoftMerauxVery HardMermentauModerately HardMetairieSlightly HardMidlandModerately HardMiltonSlightly HardMindenSoftMitchellSoftMittieSoftMonroeSoftMontegutSlightly HardMontereyVery HardMontgomerySoftMooringsportSoftMoreauvilleModerately HardMorgan CityModerately HardMorganzaSoftMoundVery HardMount AirySoftMount HermonSoftNapoleonvilleModerately HardNatalbanySoftNatchezSoftNatchitochesSoftNew IberiaHardNew OrleansSlightly HardNew RoadsSoftNew SarpyVery HardNewelltonSlightly HardNewllanoSoftNobleSoftNorcoVery HardNorwoodSoftOak RidgeSoftOakdaleSoftOberlinSoftOil CitySoftOllaSoftOpelousasSlightly HardOscarSoftOtisSoftPaincourtvilleModerately HardPalmettoSlightly HardParadisVery HardPattersonModerately HardPaulinaSlightly HardPearl RiverSoftPelicanSoftPierre PartModerately HardPine GroveSlightly HardPine PrairieVery HardPioneerModerately HardPitkinSoftPlain DealingSoftPlaquemineModerately HardPlattenvilleModerately HardPlauchevilleVery HardPleasant HillSoftPoint ClairModerately HardPointe A La HachModerately HardPollockSoftPonchatoulaSoftPort AllenSoftPort BarreSlightly HardPort SulphurModerately HardPort VincentSoftPowhatanSoftPrideModerately HardPrincetonSoftProvencalSoftQuitmanHardRacelandSoftRagleySoftRamahModerately HardRayneHardReddellSoftReevesSoftReserveSoftRichwoodSoftRinggoldSoftRoanokeSoftRobelineSoftRobertSoftRodessaSoftRosaSlightly HardRosedaleModerately HardRoselandSoftRosepineSoftRougonSoftRustonSoftSaint AmantSoftSaint BernardVery HardSaint JamesSlightly HardSaint JosephSlightly HardSaint LandrySoftSaint MartinvillVery HardSaint RoseVery HardSareptaSoftSchrieverSlightly HardScotlandvilleModerately HardScottSlightly HardShongalooSoftShreveportSoftSibleySoftSicily IslandModerately HardSieperSoftSikesSoftSimmesportModerately HardSimsboroSoftSingerSoftSlaughterSoftSlidellSoftSondheimerSoftSorrentoSoftSpearsvilleSoftSpencerSoftSpringfieldSoftSpringhillSoftStarksSoftStonewallSoftSugartownSoftSulphurSoftSummerfieldSoftSunSoftSunshineModerately HardTalisheekSoftTangipahoaSoftTempleSoftTerryVery HardTerrytownSlightly HardThe BluffsSoftTheriotSlightly HardThibodauxSoftTickfawSoftTransylvaniaVery HardTreesSoftTroutSoftTullosSoftTunicaSoftTurkey CreekSoftUraniaSoftVacherieSlightly HardVeniceModerately HardVentressSoftVickVery HardVidaliaVery HardVille PlatteVery HardVintonSoftVioletVery HardWalkerSoftWardenSlightly HardWashingtonSlightly HardWaterproofSoftWelshModerately HardWest MonroeSoftWestlakeSoftWeyanokeSoftWhite CastleModerately HardWilsonSoftWinnfieldSoftWinnsboroVery HardWisnerHardWoodworthSoftYoungsvilleSlightly HardZacharySlightly HardZwolleSoft