What was found in Coushatta'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 |
|---|---|---|---|
| Copper | 775 µg/L 60% of the EPA limit 1300 µg/L Main supplier: TOWN OF COUSHATTA WATER SYSTEM · 3,300 people · 2019
Highest in the city: 2750 µg/L — EAST CROSS WATER SYSTEM · 453 people · 2019 | 8/8 | SYR4 |
| Nitrate-Nitrite | 200 µg/L 2% of the EPA limit 10000 µg/L Main supplier: TOWN OF COUSHATTA WATER SYSTEM · 3,300 people · 2019
Highest in the city: 790 µg/L — BAYOU PIERRE WATER SYSTEM · 1,371 people · 2019 | 8/8 | SYR4 |
| Fluoride | 420 µg/L 11% of the EPA limit 4000 µg/L Main supplier: TOWN OF COUSHATTA WATER SYSTEM · 3,300 people · 2019 | 8/8 | SYR4 |
| Total Haloacetic Acids (HAA5) | 9.94 µg/L 17% of the EPA limit 60 µg/L Main supplier: TOWN OF COUSHATTA WATER SYSTEM · 3,300 people · 2019
Highest in the city: 309.343 µg/L — FAIRVIEW UNION WATER SYSTEM · 2,346 people · 2019 | 8/8 | SYR4 |
| Barium | 289.5 µg/L 14% of the EPA limit 2000 µg/L Main supplier: TOWN OF COUSHATTA WATER SYSTEM · 3,300 people · 2019 | 8/8 | SYR4 |
| TTHM | 42.855 µg/L 54% of the EPA limit 80 µg/L Main supplier: TOWN OF COUSHATTA WATER SYSTEM · 3,300 people · 2019
Highest in the city: 281.87 µg/L — FAIRVIEW UNION WATER SYSTEM · 2,346 people · 2019 | 8/8 | SYR4 |
| Chloroform | 2.38 µg/L No EPA limit set Main supplier: TOWN OF COUSHATTA WATER SYSTEM · 3,300 people · 2019
Highest in the city: 254 µg/L — FAIRVIEW UNION WATER SYSTEM · 2,346 people · 2019 | 8/8 | SYR4 |
| Trichloroacetic Acid | 1.72 µg/L No EPA limit set Main supplier: TOWN OF COUSHATTA WATER SYSTEM · 3,300 people · 2019
Highest in the city: 191.1 µg/L — FAIRVIEW UNION WATER SYSTEM · 2,346 people · 2019 | 8/8 | SYR4 |
| Dalapon | 142.307 µg/L 71% of the EPA limit 200 µg/L Highest in the city: FAIRVIEW UNION WATER SYSTEM · 2,346 people · 2019 | 1/8 | SYR4 |
| Dichloroacetic Acid | 2.71 µg/L No EPA limit set Main supplier: TOWN OF COUSHATTA WATER SYSTEM · 3,300 people · 2019
Highest in the city: 114.8 µg/L — FAIRVIEW UNION WATER SYSTEM · 2,346 people · 2019 | 8/8 | SYR4 |
| Bromoform | 25.995 µg/L No EPA limit set Main supplier: TOWN OF COUSHATTA WATER SYSTEM · 3,300 people · 2019
Highest in the city: 54.24 µg/L — HALFWAY-CARROLL WATER SYSTEM · 498 people · 2019 | 7/8 | SYR4 |
| Lithium | 44.6 µg/L No EPA limit set Main supplier: TOWN OF COUSHATTA WATER SYSTEM · 3,300 people · 2024 | 1/8 | UCMR-5 |
| Bromodichloromethane | 4.97 µg/L No EPA limit set Main supplier: TOWN OF COUSHATTA WATER SYSTEM · 3,300 people · 2019
Highest in the city: 33.2 µg/L — FAIRVIEW UNION WATER SYSTEM · 2,346 people · 2019 | 8/8 | SYR4 |
| Dibromochloromethane | 15.025 µg/L No EPA limit set Main supplier: TOWN OF COUSHATTA WATER SYSTEM · 3,300 people · 2019
Highest in the city: 29.35 µg/L — EDGEFIELD WATER SYSTEM · 375 people · 2019 | 8/8 | SYR4 |
| Monochloroacetic Acid | 16.71 µg/L No EPA limit set Highest in the city: FAIRVIEW UNION WATER SYSTEM · 2,346 people · 2019 | 7/8 | SYR4 |
| Lead | 7.25 µg/L 48% of the EPA limit 15 µg/L Main supplier: TOWN OF COUSHATTA WATER SYSTEM · 3,300 people · 2019
Highest in the city: 13.65 µg/L — MARTIN WATER SYSTEM · 1,350 people · 2019 | 8/8 | SYR4 |
| Dibromoacetic Acid | 6.94 µg/L No EPA limit set Main supplier: TOWN OF COUSHATTA WATER SYSTEM · 3,300 people · 2019
Highest in the city: 11.4 µg/L — EAST CROSS WATER SYSTEM · 453 people · 2019 | 8/8 | SYR4 |
| Monobromoacetic Acid | 10.74 µg/L No EPA limit set Highest in the city: FAIRVIEW UNION WATER SYSTEM · 2,346 people · 2019 | 6/8 | SYR4 |
| Gross Beta Particle Activity | 3.958 pCi/L No EPA limit set Main supplier: TOWN OF COUSHATTA WATER SYSTEM · 3,300 people · 2019 | 4/8 | SYR4 |
| Gross Alpha, Excl. Radon And U | 3.57 pCi/L 24% of the EPA limit 15 pCi/L Main supplier: TOWN OF COUSHATTA WATER SYSTEM · 3,300 people · 2019 | 1/8 | SYR4 |
| Combined Radium (-226 And -228) | 1.8646 pCi/L 37% of the EPA limit 5 pCi/L Main supplier: TOWN OF COUSHATTA WATER SYSTEM · 3,300 people · 2019
Highest in the city: 2.411 pCi/L — HICKORY GROVE WATER SYSTEM · 570 people · 2019 | 7/8 | SYR4 |
| Arsenic | 0.9490 µg/L 9.5% of the EPA limit 10 µg/L Main supplier: TOWN OF COUSHATTA WATER SYSTEM · 3,300 people · 2019
Highest in the city: 2 µg/L — BAYOU PIERRE WATER SYSTEM · 1,371 people · 2017 | 5/8 | SYR4 |
| Selenium | 1.3575 µg/L 2.7% of the EPA limit 50 µg/L Main supplier: TOWN OF COUSHATTA WATER SYSTEM · 3,300 people · 2019
Highest in the city: 1.9 µg/L — EAST CROSS WATER SYSTEM · 453 people · 2019 | 3/8 | SYR4 |
| Combined Uranium | 1.49 µg/L 5% of the EPA limit 30 µg/L Highest in the city: BAYOU PIERRE WATER SYSTEM · 1,371 people · 2017 | 1/8 | SYR4 |
| Di(2-ethylhexyl) Phthalate | 0.8200 µg/L 14% of the EPA limit 6 µg/L Main supplier: TOWN OF COUSHATTA WATER SYSTEM · 3,300 people · 2019
Highest in the city: 1.3475 µg/L — FAIRVIEW UNION WATER SYSTEM · 2,346 people · 2019 | 6/8 | SYR4 |
| Carbon Tetrachloride | 1.2055 µg/L 24% of the EPA limit 5 µg/L Highest in the city: FAIRVIEW UNION WATER SYSTEM · 2,346 people · 2019 | 1/8 | SYR4 |
| Carbofuran | 0.3900 µg/L 1% of the EPA limit 40 µg/L Highest in the city: HICKORY GROVE WATER SYSTEM · 570 people · 2019 | 1/8 | SYR4 |
| Di(2-ethylhexyl) Adipate | 0.3470 µg/L 0.1% of the EPA limit 400 µg/L Highest in the city: MARTIN WATER SYSTEM · 1,350 people · 2019 | 1/8 | SYR4 |
| Toluene | 0.3000 µg/L 0% of the EPA limit 1000 µg/L Highest in the city: EAST CROSS WATER SYSTEM · 453 people · 2019 | 2/8 | SYR4 |
| Hexachlorocyclopentadiene | 0.1430 µg/L 0.3% of the EPA limit 50 µg/L Highest in the city: FAIRVIEW UNION WATER SYSTEM · 2,346 people · 2019 | 1/8 | SYR4 |
| Lead | 0.00044 mg/L 2.9% of the EPA limit 0.0150 mg/L Main supplier: TOWN OF COUSHATTA WATER SYSTEM · 3,300 people · 2025
Highest in the city: 0.0050 mg/L — HALFWAY-CARROLL WATER SYSTEM · 498 people · 2023 | 8/8 | 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 Coushatta
| Supplier | Population served |
|---|---|
| TOWN OF COUSHATTA WATER SYSTEM | 3,300 |
| FAIRVIEW UNION WATER SYSTEM | 2,346 |
| BAYOU PIERRE WATER SYSTEM | 1,371 |
| MARTIN WATER SYSTEM | 1,350 |
| HICKORY GROVE WATER SYSTEM | 570 |
| HALFWAY-CARROLL WATER SYSTEM | 498 |
| EAST CROSS WATER SYSTEM | 453 |
| EDGEFIELD WATER SYSTEM | 375 |
Frequently asked questions about Coushatta tap water
Is Coushatta tap water safe to drink?
EPA testing detected 31 contaminants in the water serving Coushatta. 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 Coushatta?
8 public water suppliers report drinking-water monitoring for Coushatta, Louisiana to the EPA. Each is listed above with its population served.
What contaminants are in Coushatta's water?
The contaminants EPA monitoring detected in Coushatta include Copper, Nitrate-Nitrite, Fluoride, Total Haloacetic Acids (HAA5), Barium. 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.