No open health-based violations on EPA record in the last 10 years; latest legal-limit breach in the period starting January 2023.
Serves about 4,559 people (1,660 connections) with groundwater from its own wells.
From EPA's record for LA1039005. PurityMap is independent of Town of Mamou Water System.
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23 health-based violations in the last 10 years, from EPA's SDWIS compliance database.
| Period | Contaminant | Measured | Legal limit | EPA status |
|---|---|---|---|---|
| Jan–Mar 2023 | Haloacetic acids (HAA5) | 0.062 mg/L | 0.060 mg/L | Resolved |
| Oct–Dec 2022 | Haloacetic acids (HAA5) | 0.074 mg/L | 0.060 mg/L | Resolved |
| Jul–Sep 2022 | Total trihalomethanes (TTHM) | 0.083 mg/L | 0.080 mg/L | Resolved |
| Jul–Sep 2022 | Haloacetic acids (HAA5) | 0.069 mg/L | 0.060 mg/L | Resolved |
| Apr–Jun 2022 | Haloacetic acids (HAA5) | 0.063 mg/L | 0.060 mg/L | Resolved |
| Period | Contaminant | Measured | Legal limit | EPA status |
|---|---|---|---|---|
| Jan–Mar 2022 | Total trihalomethanes (TTHM) | 0.085 mg/L | 0.080 mg/L | Resolved |
| Jan–Mar 2022 | Haloacetic acids (HAA5) | 0.066 mg/L | 0.060 mg/L | Resolved |
| Oct–Dec 2021 | Total trihalomethanes (TTHM) | 0.088 mg/L | 0.080 mg/L | Resolved |
| Oct–Dec 2021 | Haloacetic acids (HAA5) | 0.067 mg/L | 0.060 mg/L | Resolved |
| Jul–Sep 2021 | Total trihalomethanes (TTHM) | 0.082 mg/L | 0.080 mg/L | Resolved |
| Apr–Jun 2021 | Haloacetic acids (HAA5) | 0.063 mg/L | 0.060 mg/L | Resolved |
| Apr–Jun 2021 | Total trihalomethanes (TTHM) | 0.089 mg/L | 0.080 mg/L | Resolved |
| Jan–Mar 2021 | Total trihalomethanes (TTHM) | 0.082 mg/L | 0.080 mg/L | Resolved |
| Oct–Dec 2020 | Total trihalomethanes (TTHM) | 0.081 mg/L | 0.080 mg/L | Resolved |
| Jul–Sep 2020 | Total trihalomethanes (TTHM) | 0.086 mg/L | 0.080 mg/L | Resolved |
| Jul–Sep 2020 | Haloacetic acids (HAA5) | 0.064 mg/L | 0.060 mg/L | Resolved |
| Jan–Mar 2018 | Total trihalomethanes (TTHM) | 84 µg/L | 0.080 mg/L | Resolved |
| Jan–Mar 2018 | Haloacetic acids (HAA5) | 65 µg/L | 0.060 mg/L | Resolved |
| Oct–Dec 2017 | Haloacetic acids (HAA5) | 66 µg/L | 0.060 mg/L | Resolved |
| Oct–Dec 2017 | Total trihalomethanes (TTHM) | 92 µg/L | 0.080 mg/L | Resolved |
| Jul–Sep 2017 | Total trihalomethanes (TTHM) | 90 µg/L | 0.080 mg/L | Resolved |
| Apr–Jun 2017 | Total trihalomethanes (TTHM) | 96 µg/L | 0.080 mg/L | Resolved |
| Jan–Mar 2017 | Total trihalomethanes (TTHM) | 90 µg/L | 0.080 mg/L | Resolved |
EPA required this system to test for 30 unregulated and emerging contaminants, from September 2023 to April 2024.
| Contaminant | Result | Limit | Status | Sampled | Source |
|---|---|---|---|---|---|
| Lithium | 18.6 µg/L | 10 µg/L EPA health reference level (screening, not a legal limit)Screening level, not a legal limit | Above the referenced health-based guidance value | 2023-09-26 to 2024-03-06 | UCMR5 Analytical Results: TOWN OF MAMOU WATER SYSTEM (LA1039005) |
| 11-Chloroeicosafluoro-3-oxaundecane-1-sulfonic acid (11Cl-PF3OUdS) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-09-26 to 2024-04-10 | UCMR5 Analytical Results: TOWN OF MAMOU WATER SYSTEM (LA1039005) |
| 1H, 1H, 2H, 2H-perfluorodecane sulfonic acid (8:2 FTS) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-09-26 to 2024-04-10 | UCMR5 Analytical Results: TOWN OF MAMOU WATER SYSTEM (LA1039005) |
| 1H, 1H, 2H, 2H-perfluorohexane sulfonic acid (4:2 FTS) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-09-26 to 2024-04-10 | UCMR5 Analytical Results: TOWN OF MAMOU WATER SYSTEM (LA1039005) |
| 1H, 1H, 2H, 2H-perfluorooctane sulfonic acid (6:2 FTS) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-09-26 to 2024-04-10 | UCMR5 Analytical Results: TOWN OF MAMOU WATER SYSTEM (LA1039005) |
| 4,8-Dioxa-3H-perfluorononanoic acid (ADONA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-09-26 to 2024-04-10 | UCMR5 Analytical Results: TOWN OF MAMOU WATER SYSTEM (LA1039005) |
| 9-Chlorohexadecafluoro-3-oxanone-1-sulfonic acid (9Cl-PF3ONS) | < 2 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-09-26 to 2024-04-10 | UCMR5 Analytical Results: TOWN OF MAMOU WATER SYSTEM (LA1039005) |
| Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals) | < 5 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-09-26 to 2024-04-10 | UCMR5 Analytical Results: TOWN OF MAMOU WATER SYSTEM (LA1039005) |
| N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-09-26 to 2024-04-10 | UCMR5 Analytical Results: TOWN OF MAMOU WATER SYSTEM (LA1039005) |
| N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA) | < 6 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-09-26 to 2024-04-10 | UCMR5 Analytical Results: TOWN OF MAMOU WATER SYSTEM (LA1039005) |
| Nonafluoro-3,6-dioxaheptanoic acid (NFDHA) | < 20 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-09-26 to 2024-04-10 | UCMR5 Analytical Results: TOWN OF MAMOU WATER SYSTEM (LA1039005) |
| Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-09-26 to 2024-04-10 | UCMR5 Analytical Results: TOWN OF MAMOU WATER SYSTEM (LA1039005) |
| Perfluoro-3-methoxypropanoic acid (PFMPA) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-09-26 to 2024-04-10 | UCMR5 Analytical Results: TOWN OF MAMOU WATER SYSTEM (LA1039005) |
| Perfluoro-4-methoxybutanoic acid (PFMBA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-09-26 to 2024-04-10 | UCMR5 Analytical Results: TOWN OF MAMOU WATER SYSTEM (LA1039005) |
| Perfluorobutanesulfonic acid (PFBS) | < 3 ng/L | 2,000 ng/L EPA health advisory (screening, not a legal limit)Screening level, not a legal limit | Not detected above the reporting limit | 2023-09-26 to 2024-04-10 | UCMR5 Analytical Results: TOWN OF MAMOU WATER SYSTEM (LA1039005) |
| Perfluorobutanoic acid (PFBA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-09-26 to 2024-04-10 | UCMR5 Analytical Results: TOWN OF MAMOU WATER SYSTEM (LA1039005) |
| Perfluorodecanoic acid (PFDA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-09-26 to 2024-04-10 | UCMR5 Analytical Results: TOWN OF MAMOU WATER SYSTEM (LA1039005) |
| Perfluorododecanoic acid (PFDoA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-09-26 to 2024-04-10 | UCMR5 Analytical Results: TOWN OF MAMOU WATER SYSTEM (LA1039005) |
| Perfluoroheptanesulfonic acid (PFHpS) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-09-26 to 2024-04-10 | UCMR5 Analytical Results: TOWN OF MAMOU WATER SYSTEM (LA1039005) |
| Perfluoroheptanoic acid (PFHpA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-09-26 to 2024-04-10 | UCMR5 Analytical Results: TOWN OF MAMOU WATER SYSTEM (LA1039005) |
| Perfluorohexanesulfonic acid (PFHxS) | < 3 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-09-26 to 2024-04-10 | UCMR5 Analytical Results: TOWN OF MAMOU WATER SYSTEM (LA1039005) |
| Perfluorohexanoic acid (PFHxA) | < 3 ng/L | 400,000 ng/L Michigan EGLE state MCL (strictest US state) | Not detected above the reporting limit | 2023-09-26 to 2024-04-10 | UCMR5 Analytical Results: TOWN OF MAMOU WATER SYSTEM (LA1039005) |
| Perfluorononanoic acid (PFNA) | < 4 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-09-26 to 2024-04-10 | UCMR5 Analytical Results: TOWN OF MAMOU WATER SYSTEM (LA1039005) |
| Perfluorooctanesulfonic acid (PFOS) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-09-26 to 2024-04-10 | UCMR5 Analytical Results: TOWN OF MAMOU WATER SYSTEM (LA1039005) |
| Perfluorooctanoic acid (PFOA) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-09-26 to 2024-04-10 | UCMR5 Analytical Results: TOWN OF MAMOU WATER SYSTEM (LA1039005) |
| Perfluoropentanesulfonic acid (PFPeS) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-09-26 to 2024-04-10 | UCMR5 Analytical Results: TOWN OF MAMOU WATER SYSTEM (LA1039005) |
| Perfluoropentanoic acid (PFPeA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-09-26 to 2024-04-10 | UCMR5 Analytical Results: TOWN OF MAMOU WATER SYSTEM (LA1039005) |
| Perfluorotetradecanoic acid (PFTA) | < 8 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-09-26 to 2024-04-10 | UCMR5 Analytical Results: TOWN OF MAMOU WATER SYSTEM (LA1039005) |
| Perfluorotridecanoic acid (PFTrDA) | < 7 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-09-26 to 2024-04-10 | UCMR5 Analytical Results: TOWN OF MAMOU WATER SYSTEM (LA1039005) |
| Perfluoroundecanoic acid (PFUnA) | < 2 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-09-26 to 2024-04-10 | UCMR5 Analytical Results: TOWN OF MAMOU WATER SYSTEM (LA1039005) |
Screening tells you if something is worth a closer look; a lab result is the number you can act on.
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Screening: quick check, not lab-grade
Safe Home (EnviroTestKits)
Lead, read as one of three ranges: 0–4, 5–15 or 15+ ppb
Turnaround: 5 minutes
What it can't tell you: It shows a lead range, not an exact level, and tests nothing else unless you pay extra for the optional lab test.
Lab-certified results
ETR Laboratories
50+ substances, including lead, copper, arsenic, nitrate, hardness and coliform bacteria
Environmental Testing and Research Laboratories (ETR Labs), Leominster, MA · ISO/IEC 17025:2017, ANAB certificate AT-2638 · 2–4 business days after the lab receives it
What it can't tell you: It does not test PFAS, and not every result on the panel falls under the lab's accredited scope.
Get PurityMap updates about this water system.
Follow this water →Town of Mamou Water System's phone number on EPA record is 337-468-3272. Its mailing address is TOWN OF MAMOU WATER SYSTEM, P.O. BOX 490, MAMOU, LA 70554.
According to EPA's record, Town of Mamou Water System uses groundwater from its own wells.
EPA's record shows 23 health-based violations for Town of Mamou Water System in the 10 years to July 9, 2026. No open health-based violations on EPA record in the last 10 years. The latest legal-limit breach on record was in the period starting January 2023. EPA also lists 8 missed or late tests or reports in 10 years. The record comes from EPA's SDWIS compliance database.
The 90th-percentile lead result in Town of Mamou Water System's latest lead and copper round, which ended in June 2026, was 7 µg/L, below the federal action level of 15 µg/L.
PurityMap has no verified website for Town of Mamou Water System. Its phone number on EPA record is 337-468-3272. Its mailing address on EPA record is TOWN OF MAMOU WATER SYSTEM, P.O. BOX 490, MAMOU, LA 70554. Your water bill lists the ways to contact your supplier and pay. PurityMap does not take payments.