U.S. safety records, as the agencies wrote them. Independent.
Tap water

Louisiana: drinking water systems

The 898 active community water systems in Louisiana on EPA's record, serving 5,248,290 people (EPA's counts). Systems serving more than 500 people have their own page; find yours by name, city, county, ZIP code or PWS ID. EPA's file dated Oct. 23, 2026.

414

414 of 898 systems have a health-based violation on EPA's record since Oct. 23, 2023, serving 1,838,086 of the state's 5,248,290 people (35%); 98 are an EPA enforcement priority. EPA lists 204 as currently in violation (EPA's system file of Oct. 23, 2026).

Health-based violations, in EPA's words: “Violations of maximum contaminant levels (MCLs) or maximum residual disinfectant levels (MRDLs), which specify the highest concentrations of contaminants or disinfectants, respectively, allowed in drinking water; or of treatment technique (TT) rules, which specify required processes intended to reduce the amounts of contaminants in drinking water. MCLs, MRDLs, and treatment technique rules are all health-based drinking water standards.”

Find your water system

    Health-based violations since Oct. 23, 2023, by contaminant or rule

    Groundwater Rule1,125TTHM1,082Total Haloacetic Acids (HAA5)404LEAD AND COPPER RULE REVISIONS173Interim Enhanced Surface Water Treatment Rule86Revised Total Coliform Rule78Arsenic39Surface Water Treatment Rule33

    Cities and counties EPA lists, A to Z

    The cities EPA lists as served by each system, with the number of systems that list each; a system for which EPA lists no city is under its county.

    Acadia Parish (county) 12Allen Parish (county) 10Ascension Parish (county) 19Avoyelles Parish (county) 17Beauregard Parish (county) 7Bienville Parish (county) 20Bossier Parish (county) 20Caddo Parish (county) 41Calcasieu Parish (county) 42Caldwell Parish (county) 11Cameron Parish (county) 7Catahoula Parish (county) 7Claiborne Parish (county) 12Concordia Parish (county) 7De Soto Parish (county) 9East Baton Rouge Parish (county) 5East Carroll Parish (county) 4East Feliciana Parish (county) 10Evangeline Parish (county) 13Franklin Parish (county) 7Grant Parish (county) 13Iberia Parish (county) 7Iberville Parish (county) 12Jackson Parish (county) 19Jefferson Davis Parish (county) 8Jefferson Parish (county) 4La Salle Parish (county) 12Lafayette Parish (county) 58Lincoln Parish (county) 20Livingston Parish (county) 28Madison Parish (county) 4Morehouse Parish (county) 15Natchitoches Parish (county) 12Ouachita Parish (county) 26Plaquemines Parish (county) 4Pointe Coupee Parish (county) 10Rapides Parish (county) 22Red River Parish (county) 11Richland Parish (county) 10Sabine Parish (county) 17St. James Parish (county) 4St. John the Baptist Parish (county) 4St. Landry Parish (county) 28St. Martin Parish (county) 14St. Mary Parish (county) 12St. Tammany Parish (county) 94Tangipahoa Parish (county) 21Tensas Parish (county) 5Union Parish (county) 20Vermilion Parish (county) 10Vernon Parish (county) 15Washington Parish (county) 14Webster Parish (county) 26West Baton Rouge Parish (county) 5West Carroll Parish (county) 7West Feliciana Parish (county) 3Winn Parish (county) 12

    Counties

    A page for each county EPA lists for three or more systems with a page of their own: the systems that serve it and how each stands on EPA's record.

    Acadia Parish 12Allen Parish 10Ascension Parish 19Avoyelles Parish 17Beauregard Parish 7Bienville Parish 20Bossier Parish 20Caddo Parish 41Calcasieu Parish 42Caldwell Parish 11Cameron Parish 7Catahoula Parish 7Claiborne Parish 12Concordia Parish 7De Soto Parish 9East Baton Rouge Parish 5East Carroll Parish 4East Feliciana Parish 10Evangeline Parish 13Franklin Parish 7Grant Parish 13Iberia Parish 7Iberville Parish 12Jackson Parish 19Jefferson Davis Parish 8Jefferson Parish 4La Salle Parish 12Lafayette Parish 58Lincoln Parish 20Livingston Parish 28Madison Parish 4Morehouse Parish 15Natchitoches Parish 12Ouachita Parish 26Plaquemines Parish 4Pointe Coupee Parish 10Rapides Parish 22Red River Parish 11Richland Parish 10Sabine Parish 17St. James Parish 4St. John the Baptist Parish 4St. Landry Parish 28St. Martin Parish 14St. Mary Parish 12St. Tammany Parish 94Tangipahoa Parish 21Tensas Parish 5Union Parish 20Vermilion Parish 10Vernon Parish 15Washington Parish 14Webster Parish 26West Baton Rouge Parish 5West Carroll Parish 7West Feliciana Parish 3Winn Parish 12
    Water systems with a page of their own, A to Z (638)

    From EPA's Safe Drinking Water Information System (SDWIS), through EPA ECHO's drinking water system download. Health-based violations from EPA Envirofacts, downloaded Nov. 2, 2026. EPA's file dated Oct. 23, 2026. EPA: “All compliance and enforcement data displayed on ECHO are current as of the last official quarterly refresh of the source data system, SDWIS, which may lag by three to six months.” These are records of violations, not a test of your tap water today: your water system's annual Consumer Confidence Report has its test results. Names and values are shown as EPA writes them. EPA ECHO drinking water search.