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Mamou, LA Tap Water Quality 2026

Water quality report for Mamou, LA — PFAS, lead and copper results, violation history and state inspection findings from EPA SDWIS.

A look at Mamou's drinking water using EPA enforcement records: violations, lead and copper results, PFAS sampling and state inspection findings.

Main Utility: Town Of Mamou Water System PWSID: LA1039005 Updated: 2026 Q2
✅

No federal limits exceeded on record

Lead is 7.00 ppb, 47% of the action level and no violations are open. No PFAS was detected.

D

Mamou earns a D for water quality

Graded on violations, lead, and PFAS, with state inspection findings.

Lead: 7.00 ppb — 47% of the federal action level
PFAS tested, none detected
32 violations since 2015, 24 health-based
No violations currently open
Mamou's lead level vs. all Louisiana community water systems
0 ppb5 ppb10 ppb15 ppb
Lead level: 7.00 ppb — 47% of the federal action level
✓ Lower lead than 5% of Louisiana utilities
Population Served
2921
~1660 connections
Water Source
Groundwater
Drawn from wells — SDWIS source code GW
Active Violations
0
32 since 2015, all resolved

Lead & Copper Testing

Lead (Pb)
90th percentile of tap samples collected across the distribution system
47% of EPA action level
7.00 ppb
Action level: 15 ppb
Copper (Cu)
90th percentile of tap samples. SDWIS reports a copper figure only when a system exceeds the action level, so any value here is an exceedance.
130.8% of EPA action level
1,700 ppb
Action level: 1,300 ppb
The 90th-percentile lead result is 7.00 ppb, 47% of the 15 ppb federal action level. The action level is a treatment trigger, not a legal maximum, and it is measured across sampled taps rather than at any single home. Copper reached the action level here; a copper figure appears in SDWIS only when a system triggers it.

Contaminant Violations (2015–Present)

ContaminantTypeMeasuredLimitPeriodStatus
Total Haloacetic Acids (HAA5) MCL EXCEEDANCE 0.062 MG/L 0.060 mg/L 2023 Resolved
Total Haloacetic Acids (HAA5) MCL EXCEEDANCE 0.074 MG/L 0.060 mg/L 2022 Resolved
Public Notice OTHER — — 2022 Resolved
Total Haloacetic Acids (HAA5) MCL EXCEEDANCE 0.069 MG/L 0.060 mg/L 2022 Resolved
TTHM MCL EXCEEDANCE 0.083 MG/L 0.080 mg/L 2022 Resolved
Total Haloacetic Acids (HAA5) MCL EXCEEDANCE 0.063 MG/L 0.060 mg/L 2022 Resolved
Total Haloacetic Acids (HAA5) MCL EXCEEDANCE 0.066 MG/L 0.060 mg/L 2022 Resolved
TTHM MCL EXCEEDANCE 0.085 MG/L 0.080 mg/L 2022 Resolved
Total Haloacetic Acids (HAA5) MCL EXCEEDANCE 0.067 MG/L 0.060 mg/L 2021 Resolved
TTHM MCL EXCEEDANCE 0.088 MG/L 0.080 mg/L 2021 Resolved
Public Notice OTHER — — 2021 Resolved
TTHM MCL EXCEEDANCE 0.082 MG/L 0.080 mg/L 2021 Resolved
Consumer Confidence Rule OTHER — — 2021 Resolved
TTHM MCL EXCEEDANCE 0.089 MG/L 0.080 mg/L 2021 Resolved
Total Haloacetic Acids (HAA5) MCL EXCEEDANCE 0.063 MG/L 0.060 mg/L 2021 Resolved
TTHM MCL EXCEEDANCE 0.082 MG/L 0.080 mg/L 2021 Resolved
TTHM MCL EXCEEDANCE 0.081 MG/L 0.080 mg/L 2020 Resolved
Lead and Copper Rule MONITORING AND REPORTING — TT 2020 Resolved
Total Haloacetic Acids (HAA5) MCL EXCEEDANCE 0.064 MG/L 0.060 mg/L 2020 Resolved
TTHM MCL EXCEEDANCE 0.086 MG/L 0.080 mg/L 2020 Resolved
Public Notice OTHER — — 2018 Resolved
Public Notice OTHER — — 2018 Resolved
Total Haloacetic Acids (HAA5) MCL EXCEEDANCE 65 UG/L 0.060 mg/L 2018 Resolved
TTHM MCL EXCEEDANCE 84 UG/L 0.080 mg/L 2018 Resolved
Lead and Copper Rule MONITORING AND REPORTING — TT 2017 Resolved
TTHM MCL EXCEEDANCE 92 UG/L 0.080 mg/L 2017 Resolved
Total Haloacetic Acids (HAA5) MCL EXCEEDANCE 66 UG/L 0.060 mg/L 2017 Resolved
TTHM MCL EXCEEDANCE 90 UG/L 0.080 mg/L 2017 Resolved
TTHM MCL EXCEEDANCE 96 UG/L 0.080 mg/L 2017 Resolved
TTHM MCL EXCEEDANCE 90 UG/L 0.080 mg/L 2017 Resolved
TTHM MONITORING AND REPORTING — 0.080 mg/L 2016 Resolved
TTHM MCL EXCEEDANCE 84 UG/L 0.080 mg/L 2016 Resolved
Understanding violation types MCL violations mean a contaminant exceeded the federal maximum limit — the most serious type.
TT (Treatment Technique) violations mean required treatment procedures weren't followed, but don't necessarily mean contamination occurred.

Violation History

32 violations are on record since 2015, of which 24 were health-based. All have been resolved and none remain open.

About the Main Water System

Utility Town Of Mamou Water System
PWSID LA1039005
Water source Groundwater — Drawn from wells — SDWIS source code GW
Population served 2,921
Service connections 1,660
Systems serving this area 1
Regulator State primacy agency
Data through 2026 Q2 — EPA SDWIS

Frequently Asked Questions

Is Mamou tap water safe to drink? ▼
No federal limit is exceeded on record. No violations are currently open. Lead is 7.00 ppb, 47% of the action level.
Does Mamou water have PFAS? ▼
It was tested for the six regulated PFAS compounds and none were detected.
Who supplies water to Mamou? ▼
Town Of Mamou Water System (PWSID LA1039005). Groundwater. Drawn from wells — SDWIS source code GW
When was this system last inspected? ▼
It was last inspected on 2024-12-10. Inspectors recorded 3 significant deficiencies.

What Should Mamou Residents Do?

1
Consider a filter certified for lead
Look for NSF/ANSI 53 certification for lead reduction.
2
Check for a lead service line
Lead reaches tap water mainly through service lines and household plumbing. Suppliers now publish an inventory identifying lead lines.
3
Flush before drinking
If water has sat in pipes more than six hours, run the cold tap for two minutes before drinking or cooking.

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