State system profile

PFAS in Louisiana drinking water

Active community water systems with complete EPA UCMR 5 monitoring, summarized using yearly averages from results available through January 15, 2026.

Source EPA UCMR 5 Period 2023–2025 Systems included 238 Release ucmr5-2026-01-15-analysis-v0.2
Systems with a yearly average at or above an EPA-based study benchmark
0.0%0 of 238 active community water systems

All 238 systems had enough required samples to calculate a yearly average. 0 had at least one yearly average at or above a study benchmark; 238 did not.

EPA-based study benchmark: the unrounded cutoff this research uses to reproduce EPA’s January 2026 technical-assistance classification around the April 2024 federal levels. It is not a current standard or compliance finding and cannot determine household exposure or health risk.

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ZIP codes are used only to route visitors to public water systems that reported serving them. Confirm the actual provider using a water bill or utility record.

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Compound summary

System counts in Louisiana

Each count shows how many included water systems had a yearly average at or above the named study benchmark.

Community water systems with yearly averages at or above the EPA-based study benchmarks used in the January 2026 research release for Louisiana.
Study benchmarkSystems at or above benchmarkWater systems includedPercent
PFOA: 4.05 ppt study benchmark (reproduces EPA classification around 4 ppt)02380.0%
PFOS: 4.05 ppt study benchmark (reproduces EPA classification around 4 ppt)02380.0%
PFHxS: 15 ppt study benchmark (reproduces EPA classification around 10 ppt)02380.0%
PFNA: 15 ppt study benchmark (reproduces EPA classification around 10 ppt)02380.0%
HFPO-DA: 15 ppt study benchmark (reproduces EPA classification around 10 ppt)02380.0%
Hazard Index: 1.5 study benchmark with at least two detected components (reproduces EPA classification around 1)02380.0%
System directory

Community water systems with complete monitoring

“Complete monitoring” means at least one sampling location had all required samples needed for a yearly average. Each PWSID appears once, preventing double counting across ZIP associations.

Active community water systems with complete UCMR 5 monitoring in Louisiana.
Public water systemPWSIDPopulation servedPrimary sourceSampling locationsStudy benchmark result
ABITA SPRINGS WATER SYSTEMLA11030023,693Ground water2Below all study benchmarks
ARCADIA WATER SYSTEMLA10130034,146Ground water1Below all study benchmarks
ARCHIBALD WATER SYSTEMLA10830124,200Ground water2Below all study benchmarks
ASSUMPTION PARISH WW DISTRICT 1LA100700121,366Surface water1Below all study benchmarks
AVOYELLES PARISH WATERWORKS DISTRICT 1LA10090023,900Ground water1Below all study benchmarks
AVOYELLES WARD ONE WATER SYSTEM INCLA10090163,726Ground water1Below all study benchmarks
BARKSDALE AFB WATER SYSTEMLA101502213,000Surface water purchased1Below all study benchmarks
BASTROP WATER SYSTEMLA106700318,105Ground water2Below all study benchmarks
BATON ROUGE WATER COMPANYLA1033005596,844Ground water41Below all study benchmarks
BAYOU DES CANNES WATER SYSTEMLA10390164,578Ground water1Below all study benchmarks
BAYOU LIBERTY WATER ASSOCIATIONLA110300510,791Ground water2Below all study benchmarks
BAYOU TECHE WATER WORKSLA109900210,137Ground water1Below all study benchmarks
BEAU CHENE WATER SYSTEMLA11030064,650Ground water2Below all study benchmarks
BEAUREGARD DISTRICT NO 2 WARD NO 5LA10110126,613Ground water2Below all study benchmarks
BEAUREGARD WATER WORKS DIST #3LA101100824,000Ground water6Below all study benchmarks
BELLE CHASSE WATER DISTRICTLA107500119,644Surface water1Below all study benchmarks
BLANCHARD WATER SYSTEMLA101700616,326Surface water1Below all study benchmarks
BROUILLETTE WATER SYSTEM INCLA10090033,732Ground water1Below all study benchmarks
BROWNVILLE WATER SYSTEMLA10730049,696Ground water3Below all study benchmarks
BUCKEYE WATER DISTRICT 50LA107900412,078Ground water2Below all study benchmarks
CADEVILLE WATER DISTRICTLA10730606,219Ground water4Below all study benchmarks
CALCASIEU PARISH WW DIST 9 CARLYSSLA101911614,502Ground water1Below all study benchmarks
CALCASIEU PARISH WW DISTRICT 7LA10191144,791Ground water1Below all study benchmarks
CALCASIEU PARISH WW DISTRICT 8LA10191186,834Ground water2Below all study benchmarks
CALCASIEU PARISH WW DISTRICT NO 1LA101905120,837Ground water2Below all study benchmarks
CALCASIEU PARISH WW DISTRICT NO 4LA10190535,340Ground water1Below all study benchmarks
CALCASIEU PARISH WW DISTRICT NO 5LA10190845,088Ground water1Below all study benchmarks
CAMERON PARISH WW DISTRICT 11-SWEET LAKELA10230113,507Ground water2Below all study benchmarks
CAMERON PARISH WW DISTRICT 9LA1023012871Ground water4Below all study benchmarks
CECILIA WATER CORPORATIONLA109900512,420Ground water1Below all study benchmarks
CHENIERE DREW NORTH WATER SYSTEMLA107310011,280Ground water5Below all study benchmarks
CITY OF ABBEVILLE WATER SYSTEMLA111300114,217Ground water1Below all study benchmarks
CITY OF ALEXANDRIA WATER SYSTEMLA107900166,798Ground water9Below all study benchmarks
CITY OF BAKER WATER SYSTEMLA103300313,855Ground water4Below all study benchmarks
CITY OF BOSSIER CITY WATER SYSTEMLA101500479,506Surface water1Below all study benchmarks
CITY OF BREAUX BRIDGE WATER SYSTEMLA109900310,098Ground water1Below all study benchmarks
CITY OF BROUSSARD WATER SYSTEMLA10550035,151Ground water1Below all study benchmarks
CITY OF CARENCRO WATER SYSTEMLA105500511,301Ground water2Below all study benchmarks
CITY OF DENHAM SPRINGS WATER SYSTEMLA106300425,725Ground water5Below all study benchmarks
CITY OF DERIDDER WATER SYSTEMLA101100114,400Ground water4Below all study benchmarks
CITY OF GONZALES WATER SYSTEMLA100503016,806Ground water3Below all study benchmarks
CITY OF HAMMOND WATER SYSTEMLA110500921,135Ground water5Below all study benchmarks
CITY OF JEANERETTE WATER SYSTEMLA10450046,189Ground water1Below all study benchmarks
CITY OF JENNINGS WATER SYSTEMLA10530039,837Ground water1Below all study benchmarks
CITY OF KAPLAN WATER SYSTEMLA11130094,340Ground water1Below all study benchmarks
CITY OF LAKE CHARLES WATER SYSTEMLA101902979,500Ground water6Below all study benchmarks
CITY OF MANY WATER SYSTEMLA10850164,428Surface water3Below all study benchmarks
CITY OF MARKSVILLE WATER SYSTEMLA10090117,593Ground water purchased1Below all study benchmarks
CITY OF OAKDALE WATER SYSTEMLA10030066,114Ground water1Below all study benchmarks
CITY OF OPELOUSAS WATER SYSTEMLA109701020,388Ground water2Below all study benchmarks
CITY OF PLAQUEMINE WATER SYSTEMLA104700514,043Ground water2Below all study benchmarks
CITY OF RAYNE WATER SYSTEMLA100100710,908Ground water1Below all study benchmarks
CITY OF SCOTT WATER SYSTEMLA10550269,696Ground water purchased1Below all study benchmarks
CITY OF ST MARTINVILLE WATER SYSTEMLA10990077,263Ground water1Below all study benchmarks
CITY OF VILLE PLATTE WATER SYSTEMLA10390106,590Ground water5Below all study benchmarks
CITY OF WINNFIELD WATER SYSTEMLA11270127,194Ground water1Below all study benchmarks
CITY OF YOUNGSVILLE PURCHASE WSLA10551957,623Ground water purchased2Below all study benchmarks
CONCORDIA WATERWORKS DISTRICT 1LA10290036,921Ground water1Below all study benchmarks
CONSOLIDATED WATERWORKS DISTRICT 2LA10670123,498Ground water2Below all study benchmarks
COUSHATTA WATER SYSTEMLA10810013,300Ground water1Below all study benchmarks
COVINGTON WATER SUPPLYLA110301116,185Ground water3Below all study benchmarks
CROWLEY WATER SYSTEM (LAWCO)LA100100217,733Ground water1Below all study benchmarks
CULBERTSON WATER SYSTEMLA10610243,300Ground water3Below all study benchmarks
CYPRESS BLACK BAYOU WATER SYSTEMLA10150405,520Surface water purchased1Below all study benchmarks
DELHI WATER SUPPLYLA10830024,071Ground water1Below all study benchmarks
DEQUINCY WATER SYSTEM (LAWCO)LA10190085,370Ground water2Below all study benchmarks
DUBACH WATER SYSTEMLA10610031,218Ground water2Below all study benchmarks
E JEFFERSON WW DISTRICT 1LA1051001275,163Surface water3Below all study benchmarks
EAST CENTRAL VERNON WATER SYSTEMLA11151176,363Ground water4Below all study benchmarks
EAST FELICIANA RURAL GURLEY RD WSLA103700414,829Ground water1Below all study benchmarks
EAST SIDE WATER SYSTEMLA10390035,640Ground water2Below all study benchmarks
EBARB WWKS DIST # 1 - AIMWELL AREALA10850596,738Ground water purchased1Below all study benchmarks
EGAN WATER CORPORATIONLA10010255,337Ground water1Below all study benchmarks
EUNICE WATER SYSTEM (LAWCO)LA109702215,393Ground water2Below all study benchmarks
FARMERVILLE WATER SYSTEMLA11110055,352Ground water3Below all study benchmarks
FIFTH WARD WATER SYSTEMLA10090075,676Ground water1Below all study benchmarks
FOLSOM WATER SUPPLYLA11030141,992Ground water3Below all study benchmarks
FOREST HILL UTILITIESLA10790093,600Ground water1Below all study benchmarks
FORT POLK NORTH WATER SYSTEMLA11150649,420Ground water1Below all study benchmarks
FORT POLK SOUTH WATER SYSTEMLA111506510,902Ground water2Below all study benchmarks
FSWC - HAMMOND HEIGHTSLA11050104,281Ground water4Below all study benchmarks
GARDNER COMMUNITY WATER SYSTEMLA10790104,566Ground water3Below all study benchmarks
GOWC EastLA107312111,742Ground water2Below all study benchmarks
GOWC NORTH WATER SYSTEMLA107312013,287Ground water4Below all study benchmarks
GRAMBLING WATER SYSTEMLA10610064,949Ground water3Below all study benchmarks
GRAMERCY WATERWORKSLA10930022,860Surface water1Below all study benchmarks
GREATER WARD 1 WATERWORKS DISTRICTLA10610073,333Ground water2Below all study benchmarks
GRETNA WATERWORKSLA105100317,026Surface water1Below all study benchmarks
HENDERSON NINA WATER SYSTEM INCLA10990065,535Ground water1Below all study benchmarks
HOMER WATER SYSTEM, LALA10270034,524Ground water2Below all study benchmarks
HOUMA WATER TREATMENT SERVICE AREALA110900111,658Surface water1Below all study benchmarks
HOUSTON RIVER WATERWORKS DISTRICT 11LA10191196,915Ground water1Below all study benchmarks
IBERIA WATER WORKS DISTRICT 3 - COTEAULA10450028,775Ground water1Below all study benchmarks
INTRACOASTAL WATER SYSTEM WESTLA10470026,489Surface water1Below all study benchmarks
JEFF DAVIS CENTRAL WATERWORKS DISTRICTLA10530125,709Ground water1Below all study benchmarks
JEFF DAVIS WATER AND SEWER COMMISSION 1LA10530149,780Ground water1Below all study benchmarks
JEFF DAVIS WATER DISTRICT 4LA10530134,194Ground water1Below all study benchmarks
JONESBORO WATER SYSTEM, LALA10490106,231Ground water6Below all study benchmarks
KEATCHIE WATER SYSTEMLA10310074,446Ground water7Below all study benchmarks
KIROLI DARBONNE WSLA10730209,210Ground water3Below all study benchmarks
KOLIN RUBY WISE WATERWORK DISTRICT 11 ALA10790234,992Ground water2Below all study benchmarks
LAFAYETTE UTILITIES WATER SYSTEMLA1055017169,389Ground water5Below all study benchmarks
LAFOURCHE WATER DISTRICT 1LA105700181,609Surface water3Below all study benchmarks
LAKE PROVIDENCE WATER SYSTEMLA10350025,850Ground water1Below all study benchmarks
LAWTELL WATER WORKS DISTRICT NO 1LA10970043,717Ground water1Below all study benchmarks
LEE ROAD WATER CORPORATIONLA11030207,665Ground water2Below all study benchmarks
LENA WATER SYSTEM INCLA10790193,540Ground water4Below all study benchmarks
LEWISBURG BELLEVUE WATER SYSTEMLA10970068,226Ground water1Below all study benchmarks
LOUISIANA STATE PENITENTIARYLA11250056,362Ground water1Below all study benchmarks
LPWD NORTH PRODUCTION FACILITYLA10551714,122Ground water1Below all study benchmarks
LPWD SOUTHLA105515615,132Ground water purchased1Below all study benchmarks
LPWDN NORTH REGIONLA105519116,833Ground water purchased1Below all study benchmarks
LUTCHER WATERWORKSLA10930034,781Surface water1Below all study benchmarks
MAGNOLIA PLANTATION WATER SYSTEM INCLA11130328,769Ground water1Below all study benchmarks
MAGNOLIA WATER UTILITIES - EDEN ISLESLA110301310,155Ground water1Below all study benchmarks
MAGNOLIA WATER UTILITIES - GREENLEAVESLA11031188,031Ground water2Below all study benchmarks
MANDEVILLE WATER SUPPLYLA110302313,000Ground water3Below all study benchmarks
MANSFIELD WATER SYSTEMLA10310097,512Surface water1Below all study benchmarks
MILTON PURCHASE WATER SYSTEMLA10551963,300Ground water purchased2Below all study benchmarks
MINDEN WATER SYSTEMLA111902116,281Ground water1Below all study benchmarks
MIRE BRANCH WATER CORPORATIONLA10010249,480Ground water2Below all study benchmarks
MONROE WATER SYSTEM, LALA107303157,000Surface water1Below all study benchmarks
MONTEREY RURAL WATER SYSTEM INCLA10290075,250Ground water1Below all study benchmarks
MORGAN CITY WATER SYSTEM, LALA110100512,703Surface water1Below all study benchmarks
NATCHITOCHES PARISH WWKS DISTRICT 2LA10690068,415Ground water1Below all study benchmarks
NEW CARROLL WATER SYSTEMLA11230053,507Ground water1Below all study benchmarks
NEW IBERIA WATER SYSTEM (LAWCO)LA104500959,928Ground water1Below all study benchmarks
NEW LLANO WATER DEPARTMENTLA11150223,300Ground water2Below all study benchmarks
NEW ORLEANS CARROLLTON WWLA1071009334,903Surface water3Below all study benchmarks
NEW ORLEANS ALGIERS WATER WORKSLA107100152,785Surface water1Below all study benchmarks
NEW ROADS WATER SYSTEMLA10770269,024Ground water4Below all study benchmarks
NORTH DESOTO WATER SYSTEMLA10310117,608Ground water3Below all study benchmarks
NORTH FRANKLIN WATER WORKSLA10410037,989Ground water2Below all study benchmarks
NORTH IBERVILLE WATER SYSTEMLA10470241,524Ground water2Below all study benchmarks
NORTH OF CROWLEY WATER CORPORATIONLA10010234,020Ground water1Below all study benchmarks
PARISH UTILITIES OF ASCENSIONLA10050359,732Surface water1Below all study benchmarks
PATTERSON WATER SYSTEMLA11010068,456Surface water1Below all study benchmarks
PINEHILL WATERWORKS DISTRICTLA10170274,926Surface water purchased2Below all study benchmarks
PLAISANCE WATER SYSTEMLA10970126,465Ground water1Below all study benchmarks
PLEASANT VALLEY WATER SYSTEMLA11190231,683Ground water2Below all study benchmarks
POINTE COUPEE WATER WORKS DISTRICT 1LA107704310,629Ground water4Below all study benchmarks
POLLOCK AREA WATER SYSTEM INCLA10430173,900Ground water2Below all study benchmarks
PONTCHATOULA WATER SYSTEMLA11050196,657Ground water3Below all study benchmarks
PORT ALLEN WATER SYSTEMLA11210146,759Ground water2Below all study benchmarks
PORT SULPHUR WATER DISTRICTLA107500610,308Surface water1Below all study benchmarks
PRAIRIE RONDE WATER SYSTEM INCLA10970146,090Ground water2Below all study benchmarks
RAPIDES ISLAND WATER ASSOCIATION INCLA10790205,658Ground water5Below all study benchmarks
RAPIDES PARISH WATERWORKS DISTRICT 3LA107901719,983Surface water4Below all study benchmarks
RAYVILLE WATER SYSTEMLA10830064,842Ground water1Below all study benchmarks
RESOLVE WHISPERWOOD ESTATES SD WSLA11030466,867Ground water2Below all study benchmarks
RURAL FRANKLINTON WATERLA11170033,450Ground water2Below all study benchmarks
RUSTON WATER SYSTEMLA106101722,468Ground water9Below all study benchmarks
SCHRIEVER WATER TREATMENT SERVICE AREALA1109002116,460Surface water1Below all study benchmarks
SHREVEPORT WATER SYSTEMLA1017031192,378Surface water1Below all study benchmarks
SLIDELL WATER SUPPLYLA110304135,547Ground water7Below all study benchmarks
SOUTH CLAIBORNE WATER SYSTEMLA10270063,843Ground water3Below all study benchmarks
SOUTH GRANT WATER CORPORATIONLA10430085,289Ground water3Below all study benchmarks
SOUTH MONROE WS GOWCLA10730467,335Ground water1Below all study benchmarks
SOUTH RAYNE WATER CORPORATIONLA10010224,254Ground water1Below all study benchmarks
SOUTH TOLEDO BEND WATER DISTRICTLA10850555,943Ground water1Below all study benchmarks
SOUTHEAST WATERWORKS DISTRICT 2LA11130316,810Ground water1Below all study benchmarks
SOUTHWEST ALLEN WW DISTRICT NO 2LA10030098,106Ground water3Below all study benchmarks
SOUTHWEST OUACHITA WATERWORKS, INCLA107304710,725Ground water6Below all study benchmarks
ST BERNARD PARISH WATERWORKSLA108700144,783Surface water1Below all study benchmarks
ST CHARLES PARISH DEPT OF WATERWORKSLA108900152,879Surface water2Below all study benchmarks
ST JAMES WATER DISTRICT 1LA10930047,200Surface water1Below all study benchmarks
ST JAMES WATER DISTRICT 2LA10930057,513Surface water1Below all study benchmarks
ST JOHN WATER DISTRICT 2LA10950023,702Surface water1Below all study benchmarks
ST LANDRY WATER WORKS DISTRICT 2 RURALLA10970334,761Ground water1Below all study benchmarks
ST MARY PARISH W&S #2 BAYOU VISTALA11010155,379Surface water purchased1Below all study benchmarks
ST MARY WATER & SEWER COMM #3LA11010107,828Surface water1Below all study benchmarks
ST TAM PARISH - BRIARWOOD TERRACELA110307917,536Ground water5Below all study benchmarks
ST TAM PARISH - CROSS GATES SDLA11030538,037Ground water2Below all study benchmarks
ST TAM PARISH-FAUBOURG-COQUILLELA110314918,372Ground water5Below all study benchmarks
ST TAMMANY WATER DIST 2LA11030335,200Ground water1Below all study benchmarks
SULPHUR CITY OF WATER SYSTEMLA101904424,489Ground water2Below all study benchmarks
SUMMERVILLE WATER SYSTEMLA10590091,425Ground water1Below all study benchmarks
TALLULAH WATER SYSTEMLA10650038,601Ground water1Below all study benchmarks
TANGIPAHOA (SECOND WARD) WATER DISTRICTLA11050774,112Ground water4Below all study benchmarks
TANGIPAHOA PARISH WATER DISTRICTLA110500875,873Ground water12Below all study benchmarks
TENSAS WATER DISTRICT ASSOCIATIONLA11070093,843Surface water1Below all study benchmarks
TESI OSSUN HEIGHTSLA1055140393Ground water purchased1Below all study benchmarks
THIBODAUX WATERWORKSLA105700314,862Surface water1Below all study benchmarks
TOWN & COUNTRY SERVICELA10730545,715Surface water purchased1Below all study benchmarks
TOWN OF ALBANY WATER SYSTEMLA10630227,305Ground water3Below all study benchmarks
TOWN OF AMITE WATER SYSTEMLA11050014,300Ground water3Below all study benchmarks
TOWN OF ARNAUDVILLE WATER SYSTEMLA10990013,957Ground water1Below all study benchmarks
TOWN OF BENTON WATER SYSTEMLA10150028,037Surface water purchased1Below all study benchmarks
TOWN OF BERWICKLA11010145,024Surface water purchased1Below all study benchmarks
TOWN OF BUNKIE WATER SYSTEMLA10090045,169Ground water1Below all study benchmarks
TOWN OF CHURCH POINT WATER SYSTEMLA10010014,176Ground water1Below all study benchmarks
TOWN OF ERATH WATER SYSTEMLA11130052,985Ground water1Below all study benchmarks
TOWN OF FERRIDAY WATER SYSTEMLA10290053,816Ground water1Below all study benchmarks
TOWN OF FRANKLINTON WATER SYSTEMLA11170024,150Ground water3Below all study benchmarks
TOWN OF GREENWOOD WATER SYSTEMLA10170145,205Surface water1Below all study benchmarks
TOWN OF HAUGHTON WATER SYSTEMLA10150115,355Ground water8Below all study benchmarks
TOWN OF JENA WATER SYSTEMLA10590033,614Ground water5Below all study benchmarks
TOWN OF LAKE ARTHUR WATER SYSTEMLA10530052,706Ground water2Below all study benchmarks
TOWN OF LEONVILLE WATER SYSTEMLA10970059,552Ground water3Below all study benchmarks
TOWN OF LIVINGSTON WATER SYSTEMLA10630138,946Ground water3Below all study benchmarks
TOWN OF MAMOU WATER SYSTEMLA10390054,559Ground water1Below all study benchmarks
TOWN OF MARINGOUINLA10470033,300Ground water2Below all study benchmarks
TOWN OF PEARL RIVERLA11031573,333Ground water2Below all study benchmarks
TOWN OF PLAUCHEVILLE WATER SYSTMLA10090134,233Ground water2Below all study benchmarks
TOWN OF PORT BARRE WATER SYSTEMLA10970133,828Ground water1Below all study benchmarks
TOWN OF SUNSET WATER SYSTEMLA10970154,356Ground water2Below all study benchmarks
TOWN OF VINTON WATER SYSTEMLA10190484,101Ground water1Below all study benchmarks
TOWN OF WELSH WATER SYSTEMLA10530064,311Ground water1Below all study benchmarks
TOWN OF WOODWORTH WATER SYSTEMLA10790274,818Ground water2Below all study benchmarks
UNITED WATER SYSTEMLA10990094,446Ground water1Below all study benchmarks
UTILITIES INC - KINGSPOINT SUBDIVISIONLA11030556,351Ground water2Below all study benchmarks
UTILITIES INC - NORTH PARK WATER SUPPLYLA110312411,298Ground water5Below all study benchmarks
VARNADO WATER WORKS - PINELA1117025840Ground water3Below all study benchmarks
VERMILION WATERWORKS DISTRICT 1LA111303424,132Ground water3Below all study benchmarks
VERNON PARISH WATER AND SEWER COMMISSIONLA11150715,295Ground water3Below all study benchmarks
VILLAGE OF PARKS WATER SYSTEMLA109900812,801Ground water1Below all study benchmarks
VILLAGE OF TURKEY CREEK WATER SYSTEMLA10390135,289Ground water3Below all study benchmarks
VILLAGE WATER SYSTEMLA101501810,890Ground water8Below all study benchmarks
VIVIAN WATER SYSTEMLA10170374,050Surface water1Below all study benchmarks
W JEFFERSON WW DISTRICT 2LA1051004140,264Surface water1Below all study benchmarks
WALKER WATER SYSTEMLA106301715,813Ground water4Below all study benchmarks
WARD II WATER DISTRICTLA106303978,147Ground water17Below all study benchmarks
WATER & SEWER COMMISSION 4 OF ST MARYLA11010119,709Surface water1Below all study benchmarks
WATERWORKS DISTRICT 7LA10170525,817Ground water4Below all study benchmarks
WBR DISTRICT 4 -SECTION ROAD WINTERVILLELA11210275,571Ground water3Below all study benchmarks
WBR PUBLIC UTILITIESLA11210084,329Ground water5Below all study benchmarks
WESLEY CHAPEL WATER SYSTEMLA10610204,080Ground water4Below all study benchmarks
WEST BATON ROUGE WATER WORKS DISTRICT 2LA112101813,437Ground water5Below all study benchmarks
WEST GRANT WATER ASSOCIATIONLA10430143,324Ground water1Below all study benchmarks
WEST HWY 80 ARK ROAD WSLA107305514,649Ground water2Below all study benchmarks
WEST MONROE WATER SYSTEMLA107305616,005Ground water5Below all study benchmarks
WEST VERNON PARISH WATERWORKS DISTRICTLA11151214,365Ground water1Below all study benchmarks
WESTLAKE CITY OF WATER SYSTEMLA10190544,858Ground water3Below all study benchmarks
WESTVIEW WATER WORKSLA11050281,134Ground water1Below all study benchmarks
WESTWEGO WATERWORKSLA10510058,534Surface water purchased1Below all study benchmarks
WINNSBORO WATER SYSTEMLA10410067,518Ground water1Below all study benchmarks
WWKS DISTRICT 2 OF ST HELENALA10910078,772Ground water7Below all study benchmarks
ZACHARY WATER SYSTEMLA103303031,569Ground water5Below all study benchmarks
How the count works

What is included

Each active community water system with enough required samples for a yearly average is counted once, even if it is linked with several ZIP codes. This does not mean every home was tested. Private wells are excluded, and UCMR 5 did not comprehensively monitor every small system. This page does not apply Louisiana's state-specific standards or determine compliance. Use the official state or territory drinking-water program for current regulatory information.

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Related links

PFAS Estimator system lookupNational state comparison tableFull methodology and limitationsCurrent EPA UCMR 5 Data FinderOfficial state and territory drinking-water programs