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
276–300 of 643East Allen Parish Water Works
LA1003011 · 3,030 served
St Martin Water District 4 - Catahoula
LA1099004 · 3,000 served
Town of Erath Water System
LA1113005 · 2,985 served
Oak Grove Water System
LA1123006 · 2,955 served
Reddell Vidrine Water District
LA1039007 · 2,952 served
Intracoastal Water System East
LA1047030 · 2,940 served
St Tammany Water District 3
LA1103056 · 2,920 served
Gramercy Waterworks
LA1093002 · 2,860 served
Central Claiborne Water System
LA1027009 · 2,859 served
Sligo Water System Incorporated
LA1015044 · 2,850 served
Magnolia-guste Island
LA1103189 · 2,847 served
East Richland Ww District
LA1083003 · 2,835 served
Egan Water Corporation No 2
LA1001026 · 2,835 served
East Columbia Water System
LA1021004 · 2,829 served
St Mary Parish Water Sewerage Comm 1
LA1101009 · 2,823 served
Town of Jonesville Water System
LA1025006 · 2,811 served
Belmont Waterworks Inc
LA1085053 · 2,805 served
East Feliciana Wwks District 7
LA1037014 · 2,805 served
Town of Jackson Water System
LA1037006 · 2,736 served
Town of Oberlin Water System
LA1003007 · 2,730 served
Lincoln Parish Waterworks District #3
LA1061010 · 2,730 served
Village of Cankton Water System
LA1097025 · 2,730 served
Utilities Inc - Lake Village Sd
LA1103064 · 2,724 served
Town of Hornbeck Water System
LA1115016 · 2,715 served
Town of Lake Arthur Water System
LA1053005 · 2,706 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
East Allen Parish Water Works
Violation history, PFAS records, and official source links
St Martin Water District 4 - Catahoula
Violation history, PFAS records, and official source links
Town of Erath Water System
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