How hard is the water in Louisiana?

The average water hardness across Louisiana is 91 PPM (5.3 GPG), classified as slightly hard. Hardness varies by city - the hardest higher-confidence city page is Ama (546 PPM) and the softest is Jena (1 PPM).

What city in Louisiana has the hardest water?

Ama has the hardest water among higher-confidence Louisiana city pages at 546 PPM. A water softener is recommended for residents.

How many water systems are in Louisiana?

Louisiana has 917 active community water systems serving 441 cities.

Water Hardness in Louisiana

Average: 91 PPMSlightly Hard441 cities917 water systems

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.

Useful Louisiana City Pages

Shortcuts to city pages backed by more ZIP-code or water-system data.

Cities With More Local Data

New Orleans

18 ZIPs · 4 systems

Slightly Hard (110 PPM)

Baton Rouge

16 ZIPs · 9 systems

Moderately Hard (120 PPM)

Slightly Hard (80 PPM)

Slightly Hard (110 PPM)

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	Ama	Very Hard (546 PPM)
2	Arabi	Very Hard (546 PPM)
3	Boutte	Very Hard (546 PPM)
4	Chalmette	Very Hard (546 PPM)
5	Des Allemands	Very Hard (546 PPM)
6	Hahnville	Very Hard (546 PPM)
7	Luling	Very Hard (546 PPM)
8	Meraux	Very Hard (546 PPM)
9	New Sarpy	Very Hard (546 PPM)
10	Norco	Very Hard (546 PPM)

Top 10 Softest Water Cities

#	City	Hardness
1	Jena	Soft (1 PPM)
2	Trout	Soft (1 PPM)
3	Bernice	Soft (2 PPM)
4	Lillie	Soft (2 PPM)
5	Lisbon	Soft (2 PPM)
6	Summerfield	Soft (2 PPM)
7	Chatham	Soft (2 PPM)
8	Olla	Soft (2 PPM)
9	Tullos	Soft (2 PPM)
10	Urania	Soft (2 PPM)

All Cities in Louisiana

City pages marked Estimated use fallback values and should be confirmed with local testing or utility data.

Abita SpringsSoft AcmeModerately Hard AddisSoft AimwellModerately Hard AlbanySoft AlexandriaSoft AltoHard AmaVery Hard AmiteSoft AnacocoSoft AngieSoft AngolaSoft ArabiVery Hard ArcadiaSlightly Hard ArchibaldModerately Hard ArnaudvilleSlightly Hard AshlandSoft AthensSoft AtlantaSoft Avery IslandHard BainsSoft BakerModerately Hard BaldwinModerately Hard BaratariaSlightly Hard Barksdale A F BSoft BasileVery Hard BaskinVery Hard BastropSoft BatchelorSoft Baton RougeModerately Hard BelcherSoft Bell CitySoft Belle ChasseModerately Hard Belle RoseModerately Hard BelmontSoft BentleySoft BentonSoft BerniceSoft BerwickModerately Hard BethanySoft BienvilleSoft BlanchardSoft BogalusaSoft BonitaSoft BoothvilleModerately Hard BordelonvilleModerately Hard Bossier CitySoft BourgSlightly Hard BoutteVery Hard BoyceSoft BraithwaiteModerately Hard BranchModerately Hard Bridge CitySlightly Hard BroussardSlightly Hard BruslySoft BuckeyeSoft BurasModerately Hard BushSoft CalcasieuSoft CalhounSoft CalvinSoft CameronVery Hard CamptiSoft CanktonSlightly Hard CarencroSlightly Hard CaspianaSoft CastorSoft Center PointVery Hard ChalmetteVery Hard CharentonModerately Hard ChataignierSoft ChathamSoft ChauvinSlightly Hard CheneyvilleSoft ChestnutSoft ChopinSoft ChoudrantSoft Church PointHard ClarenceSoft ClarksSoft ClaytonSoft CliftonSoft ClintonSoft ColfaxSoft CollinstonSoft ConventVery Hard Cotton ValleySoft CottonportVery Hard CovingtonSoft CreoleModerately Hard CrowleyModerately Hard CullenSoft Cut OffSoft DarrowSoft DelcambreHard DequincySoft DeridderSoft DerrySoft Des AllemandsVery Hard DixieSoft DodsonSoft DonaldsonvilleSoft DownsvilleSoft DoylineSoft Dry CreekSoft Dry ProngSoft DubachSoft DubberlySoft DulacSlightly Hard DusonSlightly Hard EchoSoft EdgardSoft EganModerately Hard ElizabethSoft Elm GroveSoft ElmerSoft EltonSoft EmpireModerately Hard EnterpriseModerately Hard EolaVery Hard EppsHard ErathHard ErosSoft ErwinvilleSoft EstherwoodModerately Hard EthelSoft EuniceModerately Hard EvangelineModerately Hard EvansSoft FarmervilleSoft FentonSoft FieldsSoft FisherSoft FlatwoodsSoft FlorienSoft FlukerSoft FolsomSoft ForbingSoft FordocheSoft Forest HillSoft Forked IslandHard Fort NecessityVery Hard Fort PolkSoft FranklinModerately Hard FranklintonSoft French SettlemenSoft FriersonSoft FrogmoreSoft GallianoSoft GalvezSoft GaryvilleSoft GeismarSoft GeorgetownSoft GheensSoft GibslandSlightly Hard GibsonSlightly Hard GilbertModerately Hard GilliamSoft GlosterSoft GlynnSoft Golden MeadowSoft GoldonnaSoft GonzalesSoft GorumSoft GoudeauVery Hard GramblingSoft GramercyVery Hard Grand CaneSoft Grand ChenierSoft Grand CoteauSlightly Hard Grand IsleSlightly Hard GrantSoft GraySlightly Hard GraysonSoft GreensburgSoft Greenwell SpringSlightly Hard GreenwoodSlightly Hard GretnaSlightly Hard Grosse TeteModerately Hard GueydanHard HackberryModerately Hard HahnvilleVery Hard Hall SummitSoft HamburgVery Hard HammondSoft HannaSoft HarahanSlightly Hard HarrisonburgSlightly Hard HarveySlightly Hard HaughtonSoft HayesSoft HaynesvilleSoft HebertSoft HeflinSoft HendersonHard HessmerSlightly Hard HesterSlightly Hard HicksSoft HodgeHard HoldenSoft HomerSoft HornbeckSoft HosstonSoft HoumaSlightly Hard HusserSoft IbervilleModerately Hard IdaSoft IndependenceSoft InnisSoft IotaModerately Hard IowaSoft JamestownSoft JarreauSoft JeaneretteHard JeffersonSlightly Hard JenaSoft JenningsModerately Hard JonesSoft JonesboroHard KaplanHard KeatchieSoft KeithvilleSoft KellySoft KennerSlightly Hard KentwoodSoft KilbourneVery Hard KinderSoft KolinSoft Krotz SpringsSlightly Hard La PlaceSoft LabadievilleModerately Hard LacassineSoft LacombeSoft LafayetteSlightly Hard LafitteSlightly Hard Lake ArthurModerately Hard Lake CharlesSoft Lake ProvidenceVery Hard LakelandSoft LaroseSoft LartoVery Hard LawtellModerately Hard Le MoyenSlightly Hard LeanderSoft LeblancSoft LecompteSoft LettsworthSoft LillieSoft LinvilleSoft LisbonSoft LivingstonSoft LivoniaSoft LockportSoft LogansportSoft LongvilleSoft LorangerSoft LoreauvilleHard LottieSoft LulingVery Hard LutcherVery Hard MadisonvilleSoft MamouVery Hard MandevilleSoft ManghamSlightly Hard MansfieldSoft MansuraVery Hard ManySoft MarksvilleVery Hard MarreroSlightly Hard MarthavilleSoft MathewsSoft MaurepasSoft MauriceHard MelroseSoft MelvilleSlightly Hard Mer RougeSoft MerauxVery Hard MermentauModerately Hard MetairieSlightly Hard MidlandModerately Hard MiltonSlightly Hard MindenSoft MitchellSoft MittieSoft MonroeSoft MontegutSlightly Hard MontereyVery Hard MontgomerySoft MooringsportSoft MoreauvilleModerately Hard Morgan CityModerately Hard MorganzaSoft MoundVery Hard Mount AirySoft Mount HermonSoft NapoleonvilleModerately Hard NatalbanySoft NatchezSoft NatchitochesSoft New IberiaHard New OrleansSlightly Hard New RoadsSoft New SarpyVery Hard NewelltonSlightly Hard NewllanoSoft NobleSoft NorcoVery Hard NorwoodSoft Oak RidgeSoft OakdaleSoft OberlinSoft Oil CitySoft OllaSoft OpelousasSlightly Hard OscarSoft OtisSoft PaincourtvilleModerately Hard PalmettoSlightly Hard ParadisVery Hard PattersonModerately Hard PaulinaSlightly Hard Pearl RiverSoft PelicanSoft Pierre PartModerately Hard Pine GroveSlightly Hard Pine PrairieVery Hard PioneerModerately Hard PitkinSoft Plain DealingSoft PlaquemineModerately Hard PlattenvilleModerately Hard PlauchevilleVery Hard Pleasant HillSoft Point ClairModerately Hard Pointe A La HachModerately Hard PollockSoft PonchatoulaSoft Port AllenSoft Port BarreSlightly Hard Port SulphurModerately Hard Port VincentSoft PowhatanSoft PrideModerately Hard PrincetonSoft ProvencalSoft QuitmanHard RacelandSoft RagleySoft RamahModerately Hard RayneHard ReddellSoft ReevesSoft ReserveSoft RichwoodSoft RinggoldSoft RoanokeSoft RobelineSoft RobertSoft RodessaSoft RosaSlightly Hard RosedaleModerately Hard RoselandSoft RosepineSoft RougonSoft RustonSoft Saint AmantSoft Saint BernardVery Hard Saint JamesSlightly Hard Saint JosephSlightly Hard Saint LandrySoft Saint MartinvillVery Hard Saint RoseVery Hard SareptaSoft SchrieverSlightly Hard ScotlandvilleModerately Hard ScottSlightly Hard ShongalooSoft ShreveportSoft SibleySoft Sicily IslandModerately Hard SieperSoft SikesSoft SimmesportModerately Hard SimsboroSoft SingerSoft SlaughterSoft SlidellSoft SondheimerSoft SorrentoSoft SpearsvilleSoft SpencerSoft SpringfieldSoft SpringhillSoft StarksSoft StonewallSoft SugartownSoft SulphurSoft SummerfieldSoft SunSoft SunshineModerately Hard TalisheekSoft TangipahoaSoft TempleSoft TerryVery Hard TerrytownSlightly Hard The BluffsSoft TheriotSlightly Hard ThibodauxSoft TickfawSoft TransylvaniaVery Hard TreesSoft TroutSoft TullosSoft TunicaSoft Turkey CreekSoft UraniaSoft VacherieSlightly Hard VeniceModerately Hard VentressSoft VickVery Hard VidaliaVery Hard Ville PlatteVery Hard VintonSoft VioletVery Hard WalkerSoft WardenSlightly Hard WashingtonSlightly Hard WaterproofSoft WelshModerately Hard West MonroeSoft WestlakeSoft WeyanokeSoft White CastleModerately Hard WilsonSoft WinnfieldSoft WinnsboroVery Hard WisnerHard WoodworthSoft YoungsvilleSlightly Hard ZacharySlightly Hard ZwolleSoft