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
76–100 of 643Southwest Ouachita Waterworks, Inc
LA1073047 · 10,725 served
Pointe Coupee Water Works District 1
LA1077043 · 10,629 served
City of Leesville Water System
LA1115019 · 10,545 served
St John Water District 1
LA1095003 · 10,484 served
Port Sulphur Water District
LA1075006 · 10,308 served
City of Broussard Purchase Water System
LA1055193 · 10,242 served
Magnolia-eden Isles
LA1103013 · 10,155 served
Bayou Teche Water Works
LA1099002 · 10,137 served
City of Youngsville Water System
LA1055035 · 9,915 served
City of Jennings Water System
LA1053003 · 9,837 served
Jeff Davis Water and Sewer Commission 1
LA1053014 · 9,780 served
Parish Utilities of Ascension
LA1005035 · 9,732 served
Water & Sewer Commission 4 of St Mary
LA1101011 · 9,709 served
City of Scott Water System
LA1055026 · 9,696 served
Brownville Water System
LA1073004 · 9,696 served
Town of Leonville Water System
LA1097005 · 9,552 served
Mire Branch Water Corporation
LA1001024 · 9,480 served
Fort Polk North Water System
LA1115064 · 9,420 served
Kiroli Darbonne Ws
LA1073020 · 9,210 served
New Roads Water System
LA1077026 · 9,024 served
Town of Livingston Water System
LA1063013 · 8,946 served
City of Youngsville Purchase Ws
LA1055195 · 8,886 served
Iberia Water Works District 3 - Coteau
LA1045002 · 8,775 served
Wwks District 2 of St Helena
LA1091007 · 8,772 served
Magnolia Plantation Water System Inc
LA1113032 · 8,769 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
Southwest Ouachita Waterworks, Inc
Violation history, PFAS records, and official source links
Pointe Coupee Water Works District 1
Violation history, PFAS records, and official source links
City of Leesville 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