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TOWN OF MAMOU WATER SYSTEM

PWS ID: LA1039005 · MAMOU, Louisiana 70554

TOWN OF MAMOU WATER SYSTEM serves 4,559 people in MAMOU, Louisiana using Groundwater water sources. It has 247 recorded EPA violations, including 207 health-based violations. PFAS "forever chemicals" were detected in UCMR5 testing (1 compound found).

Water Quality Snapshot: TOWN OF MAMOU WATER SYSTEM

TOWN OF MAMOU WATER SYSTEM is a local-owned community water system that delivers drinking water to 4,559 residents in MAMOU, Louisiana (Evangeline Parish County) through 1,660 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 247 total violations for this system , of which 207 (84%) are health-based — meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 15 monitoring and reporting violations are on file. The most recent violation on record dates to 2023.

The most frequently cited contaminant at this system is TTHM, recorded in 130 violations (MCL, health-based). Under EPA's UCMR5 PFAS monitoring program, 1 PFAS compound was detected in samples collected from this system, with a maximum reported concentration of 18.6 ppt. PFAS are persistent synthetic chemicals linked to health effects at very low exposure levels.

Across Louisiana, EPA tracks 1,234 public water systems serving 5,316,532 people, with 115,060 cumulative violations and 62,164 health-based violations on record. About 93% of systems in the state carry at least one violation, and state-wide the average per system is 93.2 violations. TOWN OF MAMOU WATER SYSTEM's 247 violations sit above the Louisiana average. Statewide, 218 of 265 UCMR5-tested systems have reported PFAS detections (82.3%). All figures above are sourced directly from EPA SDWIS and UCMR5 public data releases and are updated as EPA publishes new reporting cycles.

PFAS Detected

1 PFAS "forever chemicals" detected in testing under EPA's UCMR5 monitoring program.

Population Served
4,559
Total Violations
247
Health-Based Violations
207
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Local
Connections
1,660
County
Evangeline Parish
School/Daycare
No
MCL Violations
207
Monitoring Violations
15
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
TTHM MCL 130 2022
Total Haloacetic Acids (HAA5) MCL 74 2023
Public Notice Other 8 2022
Lead and Copper Rule MR 7 2020
Consumer Confidence Rule Other 5 2021
Coliform (TCR) MR 4 2012
TTHM MR 4 2016
Fluoride MCL 3 1982

PFAS Testing Results (UCMR5)

Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 2 of 60 samples detected PFAS.

Contaminant Date Result MRL Status
8:2 FTS 9/26/2023 <0.005 µg/L 0.005 µg/L Not Detected
PFBA 9/26/2023 <0.005 µg/L 0.005 µg/L Not Detected
HFPO-DA 9/26/2023 <0.005 µg/L 0.005 µg/L Not Detected
ADONA 9/26/2023 <0.003 µg/L 0.003 µg/L Not Detected
NEtFOSAA 9/26/2023 <0.005 µg/L 0.005 µg/L Not Detected
9Cl-PF3ONS 9/26/2023 <0.002 µg/L 0.002 µg/L Not Detected
PFTrDA 9/26/2023 <0.007 µg/L 0.007 µg/L Not Detected
NMeFOSAA 9/26/2023 <0.006 µg/L 0.006 µg/L Not Detected
PFHpA 9/26/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFMPA 9/26/2023 <0.004 µg/L 0.004 µg/L Not Detected
PFTA 9/26/2023 <0.008 µg/L 0.008 µg/L Not Detected
PFHxA 9/26/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFUnA 9/26/2023 <0.002 µg/L 0.002 µg/L Not Detected
11Cl-PF3OUdS 9/26/2023 <0.005 µg/L 0.005 µg/L Not Detected
4:2 FTS 9/26/2023 <0.003 µg/L 0.003 µg/L Not Detected
lithium 9/26/2023 18.6000 µg/L 9 µg/L Detected
PFBS 9/26/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFHxS 9/26/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFNA 9/26/2023 <0.004 µg/L 0.004 µg/L Not Detected
PFOS 9/26/2023 <0.004 µg/L 0.004 µg/L Not Detected
PFOA 9/26/2023 <0.004 µg/L 0.004 µg/L Not Detected
6:2 FTS 9/26/2023 <0.005 µg/L 0.005 µg/L Not Detected
PFDoA 9/26/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFHpS 9/26/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFPeS 9/26/2023 <0.004 µg/L 0.004 µg/L Not Detected
NFDHA 9/26/2023 <0.02 µg/L 0.02 µg/L Not Detected
PFEESA 9/26/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFMBA 9/26/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFPeA 9/26/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFDA 9/26/2023 <0.003 µg/L 0.003 µg/L Not Detected
6:2 FTS 4/10/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFHxA 4/10/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFPeS 4/10/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFHpS 4/10/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFTA 4/10/2024 <0.008 µg/L 0.008 µg/L Not Detected
PFDoA 4/10/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFDA 4/10/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFOA 4/10/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFOS 4/10/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFNA 4/10/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFHxS 4/10/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFHpA 4/10/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFBS 4/10/2024 <0.003 µg/L 0.003 µg/L Not Detected
NMeFOSAA 4/10/2024 <0.006 µg/L 0.006 µg/L Not Detected
NEtFOSAA 4/10/2024 <0.005 µg/L 0.005 µg/L Not Detected
8:2 FTS 4/10/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFTrDA 4/10/2024 <0.007 µg/L 0.007 µg/L Not Detected
HFPO-DA 4/10/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFEESA 4/10/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFMBA 4/10/2024 <0.003 µg/L 0.003 µg/L Not Detected

Verify This Water System

The figures above are aggregated from EPA's public databases. To verify the underlying records — or to file a complaint, request a Consumer Confidence Report, or check current monitoring status — go directly to the federal and state regulators that enforce the Safe Drinking Water Act for TOWN OF MAMOU WATER SYSTEM.

Federal Source of Truth

EPA SDWIS — Federal Reports

EPA's Safe Drinking Water Information System (SDWIS) holds the federal compliance record for every regulated public water system. Open the system-level report by PWS ID:

View PWS ID LA1039005 on SDWIS

Source: EPA SDWIS Federal Reports Search

State Regulator

Louisiana Drinking Water Authority

Louisiana's primacy agency administers the Safe Drinking Water Act locally. Search EPA SDWIS for the current state contact, or use the state's public health or environment department portal.

Find LA regulator via EPA SDWIS

Violation Timeline

Each row links to the EPA SDWIS public record for verification. Cross-reference the contaminant code on EPA's federal report to see violation dates, return-to-compliance status, and enforcement actions.

Year (latest) Contaminant Category Count EPA Record
2023 Total Haloacetic Acids (HAA5) MCL 74 SDWIS / LA1039005 / 2456
2022 TTHM MCL 130 SDWIS / LA1039005 / 2950
2022 Public Notice Other 8 SDWIS / LA1039005 / 7500
2021 Consumer Confidence Rule Other 5 SDWIS / LA1039005 / 7000
2020 Lead and Copper Rule MR 7 SDWIS / LA1039005 / 5000
2016 TTHM MR 4 SDWIS / LA1039005 / 2950
2012 Coliform (TCR) MR 4 SDWIS / LA1039005 / 3100
1982 Fluoride MCL 3 SDWIS / LA1039005 / 1025

How TOWN OF MAMOU WATER SYSTEM Compares

Cross-reference this system's record against state averages and the federal MCL framework for context.

Metric TOWN OF MAMOU WATER SYSTEM Louisiana avg Federal benchmark
Total violations 247 93.2 SDWA compliance — any non-zero count is a recorded breach
Health-based violations 207 50.4 Indicates a contaminant exceeded a federal MCL
PFAS detection 1 compound 82.3% EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 4,559 4,308 Sizing context for compliance burden

Sources: EPA SDWIS and EPA National Primary Drinking Water Regulations (40 CFR Part 141). State averages computed across 1,234 regulated public water systems in Louisiana.

Federal MCL reference — Safe Drinking Water Act thresholds ▼
Contaminant Federal MCL / Action Level Note
Lead 0 mg/L (Action Level: 0.015 mg/L) Lead and Copper Rule treatment technique
Arsenic 0.010 mg/L (10 ppb) Health-based MCL since 2006
Total Coliform Treatment technique (RTCR) Indicator organism, monitoring trigger
PFOA / PFOS (PFAS) 4.0 ppt each (final 2024 rule) Compliance deadline 2029
Nitrate (as N) 10 mg/L Acute health risk for infants

Frequently Asked Questions

Is TOWN OF MAMOU WATER SYSTEM water safe to drink? ▼
TOWN OF MAMOU WATER SYSTEM (PWS ID: LA1039005) has 247 recorded violations in the EPA SDWIS database. PFAS contamination has been detected in UCMR5 testing, with 1 PFAS compound found. This system serves 4,559 people using Groundwater sources.
How many people does TOWN OF MAMOU WATER SYSTEM serve? ▼
TOWN OF MAMOU WATER SYSTEM serves 4,559 people in MAMOU, Louisiana. It is a Local-owned system using Groundwater water sources with 1,660 service connections.
What type of violations does TOWN OF MAMOU WATER SYSTEM have? ▼
TOWN OF MAMOU WATER SYSTEM has 247 total violations: 207 health-based violations (MCL exceedances or treatment failures), 15 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in TOWN OF MAMOU WATER SYSTEM water? ▼
Yes. UCMR5 testing detected 1 PFAS compound in TOWN OF MAMOU WATER SYSTEM's water supply: lithium. PFAS are persistent "forever chemicals" that do not break down in the environment.
What water source does TOWN OF MAMOU WATER SYSTEM use? ▼
TOWN OF MAMOU WATER SYSTEM uses Groundwater as its primary water source. It is classified as a Community Water System (CWS), serving residential populations year-round.
Where does this data come from? ▼
All data comes from the EPA Safe Drinking Water Information System (SDWIS) and the UCMR5 PFAS monitoring program. SDWIS tracks compliance for all public water systems regulated under the Safe Drinking Water Act.

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Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025. PFAS data from EPA UCMR5 monitoring program (2023-2025). This data is provided for informational purposes only.

Read our methodology — how this data is sourced, computed, and verified.

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Data sourced from $official public datasets. See our methodology for details. Retrieved and formatted by Kiznis Studio Editorial