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
476–500 of 643Leland Water System Inc
LA1025007 · 1,140 served
Westview Water Works
LA1105028 · 1,134 served
Cypress Water System
LA1013019 · 1,125 served
Quail Ridge Estates Water System
LA1019105 · 1,119 served
Village of Simpson Water System
LA1115032 · 1,116 served
Town of Merryville Water System
LA1011007 · 1,107 served
Mount Hermon Water District
LA1117021 · 1,107 served
Monticello Water System
LA1035004 · 1,104 served
Newellton Water System
LA1107003 · 1,100 served
Mer Rouge Water System
LA1067009 · 1,098 served
Town of Boyce Water System
LA1079003 · 1,095 served
West Sterlington Water System
LA1111017 · 1,095 served
Hineston Water System, Inc
LA1079012 · 1,089 served
Highway 1148 Water System
LA1047026 · 1,086 served
Simsboro Water System
LA1061018 · 1,083 served
East Carroll Ws South
LA1035007 · 1,071 served
Southwest Avoyelles Water District
LA1009015 · 1,053 served
Poland Water Association
LA1079025 · 1,044 served
Bayou Macon Water System
LA1065005 · 1,041 served
Bellwood Water System
LA1069014 · 1,032 served
Jenkins Community Water System
LA1119016 · 1,026 served
Hagewood Water System
LA1069005 · 1,017 served
Morganza Water System
LA1077025 · 1,005 served
Wards 4 & 5 Water System
LA1021010 · 1,002 served
State of La Military Dept - Camp Minden
LA1119018 · 1,001 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
Leland Water System Inc
Violation history, PFAS records, and official source links
Westview Water Works
Violation history, PFAS records, and official source links
Cypress 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