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
1–25 of 643Baton Rouge Water Company
LA1033005 · 596,844 served
New Orleans Carrollton Water Works
LA1071009 · 334,903 served
E Jefferson Ww District 1
LA1051001 · 275,163 served
Shreveport Water System
LA1017031 · 192,378 served
Lafayette Utilities Water System
LA1055017 · 169,389 served
W Jefferson Ww District 2
LA1051004 · 140,264 served
Schriever Water Treatment Service Area
LA1109002 · 116,460 served
Lafourche Water District 1
LA1057001 · 81,609 served
City of Lake Charles Water System
LA1019029 · 79,500 served
City of Bossier City Water System
LA1015004 · 78,960 served
Ward Ii Water District
LA1063039 · 73,506 served
Tangipahoa Parish Water District
LA1105008 · 72,504 served
City of Alexandria Water System
LA1079001 · 66,798 served
New Iberia Water System (lawco)
LA1045009 · 59,928 served
Monroe Water System
LA1073031 · 57,000 served
St Charles Parish Dept of Waterworks
LA1089001 · 52,879 served
New Orleans Algiers Water Works
LA1071001 · 52,785 served
St Bernard Parish Waterworks
LA1087001 · 44,783 served
Slidell Water Supply
LA1103041 · 35,547 served
St John Water District 3
LA1095007 · 31,965 served
Zachary Water System
LA1033030 · 31,569 served
Natchitoches Water System
LA1069007 · 27,693 served
City of Denham Springs Water System
LA1063004 · 25,725 served
Sulphur City of Water System
LA1019044 · 24,489 served
Vermilion Waterworks District 1
LA1113034 · 24,132 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
Baton Rouge Water Company
Violation history, PFAS records, and official source links
New Orleans Carrollton Water Works
Violation history, PFAS records, and official source links
E Jefferson 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