State Hub
Louisiana Water Quality
643
Utilities in database
5.2M
Residents served
6
With open violations
262
PFAS monitored
Quick Answer
Louisiana public drinking water is served by 643 EPA-tracked water systems, providing service to approximately 5.2 million residents through public utilities. 6 of those systems currently have open health-based violations on record in the EPA federal database. 262 systems have official PFAS monitoring records from the EPA UCMR 5 program (2023–2025). About 18% of LA residents use private wells, which fall outside federal utility compliance monitoring.
6 Louisiana water systems have open health-based violations recorded in EPA SDWIS. An open violation means a contaminant exceeded a federal limit and the violation has not been formally resolved in the federal database. Check individual utility pages for current status.
Open Health-Based Violations in Louisiana
Records sourced from EPA SDWIS. A record may be under review or resolved at the utility level but not yet updated in federal records. Water Utility Report does not determine whether water is safe to drink.
Drinking Water in Louisiana
Louisiana has 643 community water systems serving approximately 5.2 million residents. Primary water sources include groundwater. The most commonly reported contaminants include disinfection byproducts, nitrates. 18% of Louisiana residents rely on private wells. DEQ holds primary enforcement authority under the Safe Drinking Water Act.
Highest Risk Utilities
Louisiana systems with open health-based violations in EPA records.
Safest Large Utilities
Louisiana systems with no open health violations serving 10,000+ residents.
Utilities in Louisiana
26–50 of 643Beauregard Water Works Dist #3
LA1011008 · 24,000 served
Ruston Water System
LA1061017 · 22,468 served
Assumption Parish Ww District 1
LA1007001 · 21,366 served
City of Hammond Water System
LA1105009 · 21,135 served
Calcasieu Parish Ww District No 1
LA1019051 · 20,837 served
City of Opelousas Water System
LA1097010 · 20,388 served
City of Pineville Water System
LA1079016 · 20,358 served
Rapides Parish Waterworks District 3
LA1079017 · 19,983 served
Belle Chasse Water District
LA1075001 · 19,644 served
St Tam Parish- Bedico -faubourg-coquille
LA1103149 · 18,372 served
Bastrop Water System
LA1067003 · 18,105 served
Crowley Water System (lawco)
LA1001002 · 17,733 served
St Tam Parish - Briarwood Terrace
LA1103079 · 17,536 served
Gretna Waterworks
LA1051003 · 17,026 served
Lpwdn North Region
LA1055191 · 16,833 served
City of Gonzales Water System
LA1005030 · 16,806 served
Blanchard Water System
LA1017006 · 16,326 served
Minden Water System
LA1119021 · 16,281 served
Covington Water Supply
LA1103011 · 16,185 served
West Monroe Water System
LA1073056 · 16,005 served
Walker Water System
LA1063017 · 15,813 served
Eunice Water System (lawco)
LA1097022 · 15,393 served
Lpwd South
LA1055156 · 15,132 served
Thibodaux Waterworks
LA1057003 · 14,862 served
East Feliciana Rural Water
LA1037004 · 14,829 served
Key Contaminant Concerns in Louisiana
These contaminants appear most frequently in Louisiana utility records or pose elevated risk in this region based on EPA data.
Nitrates
Nitrate (NO₃⁻) is a nitrogen-containing compound that forms naturally through the decomposition of organic matter. At elevated concentrations — almost always caused by human activity — nitrate is converted in the digestive system to nitrite, which then reacts with hemoglobin to form methemoglobin, a form of hemoglobin that cannot carry oxygen. In the body, nitrite also reacts with amines in food to form N-nitroso compounds (nitrosamines) — known carcinogens classified by the IARC as Group 2A (probable human carcinogens). The United States applies over 23 million tons of nitrogen fertilizer annually, making agricultural runoff the dominant source of nitrate contamination in U.S. groundwater.
EPA limit: 10 mg/L
DBPs
When utilities add chlorine to water to kill pathogens, it reacts with dissolved organic matter — leaves, algae, soil — to produce disinfection byproducts (DBPs). Over 600 DBPs have been identified. The EPA regulates two groups: total trihalomethanes (TTHMs, including chloroform) and haloacetic acids (HAA5). DBP levels tend to be highest in surface water systems and in warm months when organic matter is elevated.
EPA limit: 80 µg/L (TTHMs) / 60 µg/L (HAA5)
Independent Water Testing
Find a certified lab in Louisiana
Utility compliance records show what water systems report to the EPA. An independent test from a certified laboratory confirms what's actually in your tap water. Louisiana labs can test for PFAS, lead, nitrates, bacteria, and dozens of other contaminants.
Explore Water Quality in Louisiana
Beauregard Water Works Dist #3
Violation history, PFAS records, and official source links
Ruston Water System
Violation history, PFAS records, and official source links
Assumption Parish Ww District 1
Violation history, PFAS records, and official source links
PFAS monitoring records — Louisiana
262 water systems in Louisiana with EPA UCMR 5 records
Active drinking water violations
6 open health-based violations on record — view official EPA SDWIS data
Lead in Louisiana drinking water
State-specific lead data, violation utilities, and testing guidance
PFAS in Louisiana drinking water
State-specific PFAS data, MCL context, and treatment options
Certified water testing labs in Louisiana
Labs certified for PFAS (EPA 533/537.1), lead, and bacteria testing
Water treatment options
Reverse osmosis, activated carbon, and filtration guides with cost ranges
Data sources and methodology
How WaterUtilityReport.com sources and validates official EPA data
Common Questions About Louisiana Drinking Water
Does Louisiana drinking water have PFAS?
262 Louisiana water systems have EPA UCMR 5 PFAS monitoring records (2023–2025)
Which Louisiana water utilities have open violations?
6 systems have open health-based violations in EPA SDWIS — search for your utility
How do I test my water in Louisiana?
State-certified labs for PFAS (EPA 533/537.1), lead, nitrate, and bacteria testing
What treatment removes PFAS from LA tap water?
Reverse osmosis removes PFAS, lead, arsenic, and nitrates — cost, maintenance, and NSF certification explained
What do Louisiana PFAS records tell me about my water?
EPA limits, health context, and what UCMR 5 detection above MRL means for your water
How is Louisiana water quality data sourced here?
EPA SDWIS violations, UCMR 5 PFAS records, and CCR data — sources, accuracy notes, and limitations
Louisiana Water FAQs
Data sources: Utility compliance and violation data from EPA SDWIS (Safe Drinking Water Information System). PFAS monitoring records from EPA UCMR 5 (Unregulated Contaminant Monitoring Rule 5, 2023–2025). Contaminant data from EPA and ATSDR public references. This page summarizes public records — it is not a compliance determination. Methodology →
Last updated: 2026-04-19