What was found in Mamou's water
The level at the city's main supplier, the highest level anywhere in the city, the EPA limit for each, and where every figure comes from.
| Contaminant | Level vs EPA limit | Suppliers | Source |
|---|---|---|---|
| Fluoride | 3000 µg/L 75% of the EPA limit 4000 µg/L Main supplier: TOWN OF MAMOU WATER SYSTEM · 4,559 people · 2019 | 1/1 | SYR4 |
| Barium | 276.2 µg/L 14% of the EPA limit 2000 µg/L Main supplier: TOWN OF MAMOU WATER SYSTEM · 4,559 people · 2018 | 1/1 | SYR4 |
| Copper | 229.9999999999999 µg/L 18% of the EPA limit 1300 µg/L Main supplier: TOWN OF MAMOU WATER SYSTEM · 4,559 people · 2018 | 1/1 | SYR4 |
| TTHM | 100.475 µg/L 126% of the EPA limit, at the 95th percentile of samples — 80 µg/L Main supplier: TOWN OF MAMOU WATER SYSTEM · 4,559 people · 2019 | 1/1 | SYR4 |
| Chloroform | 84.27 µg/L No EPA limit set Main supplier: TOWN OF MAMOU WATER SYSTEM · 4,559 people · 2019 | 1/1 | SYR4 |
| Total Haloacetic Acids (HAA5) | 75.79499999999997 µg/L 126% of the EPA limit, at the 95th percentile of samples — 60 µg/L Main supplier: TOWN OF MAMOU WATER SYSTEM · 4,559 people · 2019 | 1/1 | SYR4 |
| Trichloroacetic Acid | 49.65 µg/L No EPA limit set Main supplier: TOWN OF MAMOU WATER SYSTEM · 4,559 people · 2019 | 1/1 | SYR4 |
| Dichloroacetic Acid | 25.779999999999998 µg/L No EPA limit set Main supplier: TOWN OF MAMOU WATER SYSTEM · 4,559 people · 2019 | 1/1 | SYR4 |
| Lithium | 18.6 µg/L No EPA limit set Main supplier: TOWN OF MAMOU WATER SYSTEM · 4,559 people · 2024 | 1/1 | UCMR-5 |
| Bromodichloromethane | 14.649999999999999 µg/L No EPA limit set Main supplier: TOWN OF MAMOU WATER SYSTEM · 4,559 people · 2019 | 1/1 | SYR4 |
| Monochloroacetic Acid | 6.389999999999998 µg/L No EPA limit set Main supplier: TOWN OF MAMOU WATER SYSTEM · 4,559 people · 2019 | 1/1 | SYR4 |
| Monobromoacetic Acid | 3.199 µg/L No EPA limit set Main supplier: TOWN OF MAMOU WATER SYSTEM · 4,559 people · 2019 | 1/1 | SYR4 |
| Lead | 2.9499999999999993 µg/L 20% of the EPA limit 15 µg/L Main supplier: TOWN OF MAMOU WATER SYSTEM · 4,559 people · 2018 | 1/1 | SYR4 |
| Arsenic | 2.425 µg/L 24% of the EPA limit 10 µg/L Main supplier: TOWN OF MAMOU WATER SYSTEM · 4,559 people · 2018 | 1/1 | SYR4 |
| Dibromochloromethane | 2.1685 µg/L No EPA limit set Main supplier: TOWN OF MAMOU WATER SYSTEM · 4,559 people · 2019 | 1/1 | SYR4 |
| Dalapon | 1.5 µg/L 0.8% of the EPA limit 200 µg/L Main supplier: TOWN OF MAMOU WATER SYSTEM · 4,559 people · 2018 | 1/1 | SYR4 |
| Combined Uranium | 1.49 µg/L 5% of the EPA limit 30 µg/L Main supplier: TOWN OF MAMOU WATER SYSTEM · 4,559 people · 2018 | 1/1 | SYR4 |
| Bromoform | 1.462 µg/L No EPA limit set Main supplier: TOWN OF MAMOU WATER SYSTEM · 4,559 people · 2019 | 1/1 | SYR4 |
| Gross Beta Particle Activity | 1.14 pCi/L No EPA limit set Main supplier: TOWN OF MAMOU WATER SYSTEM · 4,559 people · 2018 | 1/1 | SYR4 |
| Dibromoacetic Acid | 0.8840 µg/L No EPA limit set Main supplier: TOWN OF MAMOU WATER SYSTEM · 4,559 people · 2019 | 1/1 | SYR4 |
| Combined Radium (-226 And -228) | 0.8290 pCi/L 17% of the EPA limit 5 pCi/L Main supplier: TOWN OF MAMOU WATER SYSTEM · 4,559 people · 2018 | 1/1 | SYR4 |
| Carbon Tetrachloride | 0.7215 µg/L 14% of the EPA limit 5 µg/L Main supplier: TOWN OF MAMOU WATER SYSTEM · 4,559 people · 2018 | 1/1 | SYR4 |
| Lead | 0.0070 mg/L 47% of the EPA limit 0.0150 mg/L Main supplier: TOWN OF MAMOU WATER SYSTEM · 4,559 people · 2026 | 1/1 | LCR |
Each bar shows the measured level as a share of the EPA limit: green is
well under, amber is close to it, red is over. For lead and copper the
limit applies to exactly the 90th-percentile figure shown, so red there
means a real exceedance. For everything else the limit applies to a
running annual average while the figure is the 95th percentile of the
system's samples — over 100% is worth reading, but is not by itself a
violation.
Formal violations are listed separately.
These are the utilities' own EPA-reported results, not a city-wide
average. A detection means the lab measured the
substance — it isn't the same as exceeding a legal limit. Hover a source
tag to see the EPA program and years behind each figure.
Water suppliers serving Mamou
| Supplier | Population served |
|---|---|
| TOWN OF MAMOU WATER SYSTEM | 4,559 |
Frequently asked questions about Mamou tap water
Is Mamou tap water safe to drink?
EPA testing detected 23 contaminants in the water serving Mamou. A detection isn't the same as a violation — most detected levels are within federal limits. Check the level and source for each contaminant above, and your utility's annual Consumer Confidence Report for the official compliance status.
How many water suppliers serve Mamou?
1 public water supplier report drinking-water monitoring for Mamou, Louisiana to the EPA. Each is listed above with its population served.
What contaminants are in Mamou's water?
The contaminants EPA monitoring detected in Mamou include Fluoride, Barium, Copper, TTHM, Chloroform. The full list, with the level at the main supplier and the data source, is in the table above.
Where does this data come from?
Every figure is official EPA drinking-water monitoring — the Lead & Copper Rule, the UCMR-5 nationwide testing program, and the EPA Six-Year Review — not our own testing. Each number is labelled with its source and period.