What was found in Houma'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 |
|---|---|---|---|
| Nitrate-Nitrite | 1455 µg/L 15% of the EPA limit 10000 µg/L Main supplier: SCHRIEVER WATER TREATMENT SERVICE AREA · 116,460 people · 2019 | 2/2 | SYR4 |
| Fluoride | 965 µg/L 24% of the EPA limit 4000 µg/L Main supplier: SCHRIEVER WATER TREATMENT SERVICE AREA · 116,460 people · 2019
Highest in the city: 1100 µg/L — HOUMA WATER TREATMENT SERVICE AREA · 11,658 people · 2019 | 2/2 | SYR4 |
| Copper | 830 µg/L 64% of the EPA limit 1300 µg/L Main supplier: SCHRIEVER WATER TREATMENT SERVICE AREA · 116,460 people · 2019 | 2/2 | SYR4 |
| Nitrate | 330 µg/L 3.3% of the EPA limit 10000 µg/L Main supplier: SCHRIEVER WATER TREATMENT SERVICE AREA · 116,460 people · 2015 | 1/2 | SYR4 |
| TTHM | 57.28 µg/L 72% of the EPA limit 80 µg/L Main supplier: SCHRIEVER WATER TREATMENT SERVICE AREA · 116,460 people · 2019
Highest in the city: 89.2 µg/L — HOUMA WATER TREATMENT SERVICE AREA · 11,658 people · 2019 | 2/2 | SYR4 |
| Barium | 59 µg/L 2.9% of the EPA limit 2000 µg/L Main supplier: SCHRIEVER WATER TREATMENT SERVICE AREA · 116,460 people · 2019
Highest in the city: 67 µg/L — HOUMA WATER TREATMENT SERVICE AREA · 11,658 people · 2019 | 2/2 | SYR4 |
| Chloroform | 37.8 µg/L No EPA limit set Main supplier: SCHRIEVER WATER TREATMENT SERVICE AREA · 116,460 people · 2019
Highest in the city: 60.885 µg/L — HOUMA WATER TREATMENT SERVICE AREA · 11,658 people · 2019 | 2/2 | SYR4 |
| Total Haloacetic Acids (HAA5) | 54.81 µg/L 91% of the EPA limit 60 µg/L Main supplier: SCHRIEVER WATER TREATMENT SERVICE AREA · 116,460 people · 2019 | 2/2 | SYR4 |
| Dichloroacetic Acid | 25.55 µg/L No EPA limit set Main supplier: SCHRIEVER WATER TREATMENT SERVICE AREA · 116,460 people · 2019 | 2/2 | SYR4 |
| Trichloroacetic Acid | 25.15 µg/L No EPA limit set Main supplier: SCHRIEVER WATER TREATMENT SERVICE AREA · 116,460 people · 2019 | 2/2 | SYR4 |
| Bromodichloromethane | 15 µg/L No EPA limit set Main supplier: SCHRIEVER WATER TREATMENT SERVICE AREA · 116,460 people · 2019
Highest in the city: 23.9 µg/L — HOUMA WATER TREATMENT SERVICE AREA · 11,658 people · 2019 | 2/2 | SYR4 |
| Dalapon | 15.9292 µg/L 8% of the EPA limit 200 µg/L Main supplier: SCHRIEVER WATER TREATMENT SERVICE AREA · 116,460 people · 2019 | 2/2 | SYR4 |
| Selenium | 10 µg/L 20% of the EPA limit 50 µg/L Main supplier: SCHRIEVER WATER TREATMENT SERVICE AREA · 116,460 people · 2019 | 2/2 | SYR4 |
| Lithium | 9.28 µg/L No EPA limit set Main supplier: SCHRIEVER WATER TREATMENT SERVICE AREA · 116,460 people · 2024
Highest in the city: 9.98 µg/L — HOUMA WATER TREATMENT SERVICE AREA · 11,658 people · 2024 | 2/2 | UCMR-5 |
| Dibromochloromethane | 6.85 µg/L No EPA limit set Main supplier: SCHRIEVER WATER TREATMENT SERVICE AREA · 116,460 people · 2019
Highest in the city: 8.84 µg/L — HOUMA WATER TREATMENT SERVICE AREA · 11,658 people · 2019 | 2/2 | SYR4 |
| Cyanide | 5.8 µg/L 2.9% of the EPA limit 200 µg/L Highest in the city: HOUMA WATER TREATMENT SERVICE AREA · 11,658 people · 2019 | 1/2 | SYR4 |
| Lead | 5 µg/L 33% of the EPA limit 15 µg/L Main supplier: SCHRIEVER WATER TREATMENT SERVICE AREA · 116,460 people · 2019 | 2/2 | SYR4 |
| Monochloroacetic Acid | 4.655 µg/L No EPA limit set Main supplier: SCHRIEVER WATER TREATMENT SERVICE AREA · 116,460 people · 2019 | 2/2 | SYR4 |
| Monobromoacetic Acid | 0.4100 µg/L No EPA limit set Main supplier: SCHRIEVER WATER TREATMENT SERVICE AREA · 116,460 people · 2019
Highest in the city: 3.955 µg/L — HOUMA WATER TREATMENT SERVICE AREA · 11,658 people · 2019 | 2/2 | SYR4 |
| Gross Beta Particle Activity | 2.836 pCi/L No EPA limit set Main supplier: SCHRIEVER WATER TREATMENT SERVICE AREA · 116,460 people · 2019
Highest in the city: 3.589 pCi/L — HOUMA WATER TREATMENT SERVICE AREA · 11,658 people · 2019 | 2/2 | SYR4 |
| Dibromoacetic Acid | 2.6 µg/L No EPA limit set Main supplier: SCHRIEVER WATER TREATMENT SERVICE AREA · 116,460 people · 2019 | 2/2 | SYR4 |
| Bromoform | 1.48 µg/L No EPA limit set Main supplier: SCHRIEVER WATER TREATMENT SERVICE AREA · 116,460 people · 2019 | 2/2 | SYR4 |
| Antimony, Total | 1 µg/L 17% of the EPA limit 6 µg/L Highest in the city: HOUMA WATER TREATMENT SERVICE AREA · 11,658 people · 2019 | 1/2 | SYR4 |
| Arsenic | 0.5000 µg/L 5% of the EPA limit 10 µg/L Main supplier: SCHRIEVER WATER TREATMENT SERVICE AREA · 116,460 people · 2019
Highest in the city: 1 µg/L — HOUMA WATER TREATMENT SERVICE AREA · 11,658 people · 2019 | 2/2 | SYR4 |
| Di(2-ethylhexyl) Phthalate | 0.9820 µg/L 16% of the EPA limit 6 µg/L Main supplier: SCHRIEVER WATER TREATMENT SERVICE AREA · 116,460 people · 2019 | 2/2 | SYR4 |
| Combined Radium (-226 And -228) | 0.7270 pCi/L 15% of the EPA limit 5 pCi/L Main supplier: SCHRIEVER WATER TREATMENT SERVICE AREA · 116,460 people · 2019
Highest in the city: 0.8193 pCi/L — HOUMA WATER TREATMENT SERVICE AREA · 11,658 people · 2019 | 2/2 | SYR4 |
| Atrazine | 0.3940 µg/L 13% of the EPA limit 3 µg/L Main supplier: SCHRIEVER WATER TREATMENT SERVICE AREA · 116,460 people · 2019
Highest in the city: 0.6500 µg/L — HOUMA WATER TREATMENT SERVICE AREA · 11,658 people · 2019 | 2/2 | SYR4 |
| 2,4-D | 0.1300 µg/L 0.2% of the EPA limit 70 µg/L Highest in the city: HOUMA WATER TREATMENT SERVICE AREA · 11,658 people · 2019 | 1/2 | SYR4 |
| Pfba | 0.0068 µg/L No EPA limit set Main supplier: SCHRIEVER WATER TREATMENT SERVICE AREA · 116,460 people · 2024
Highest in the city: 0.0080 µg/L — HOUMA WATER TREATMENT SERVICE AREA · 11,658 people · 2024 | 2/2 | UCMR-5 |
| Endrin | 0.0054 µg/L 0.3% of the EPA limit 2 µg/L Main supplier: SCHRIEVER WATER TREATMENT SERVICE AREA · 116,460 people · 2019 | 1/2 | SYR4 |
| Pfpea | 0.0037 µg/L No EPA limit set Highest in the city: HOUMA WATER TREATMENT SERVICE AREA · 11,658 people · 2024 | 1/2 | UCMR-5 |
| Pfhxa | 0.0032 µg/L No EPA limit set Main supplier: SCHRIEVER WATER TREATMENT SERVICE AREA · 116,460 people · 2024 | 1/2 | UCMR-5 |
| Lead | 0.0010 mg/L 6.7% of the EPA limit 0.0150 mg/L Main supplier: SCHRIEVER WATER TREATMENT SERVICE AREA · 116,460 people · 2025 | 2/2 | 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 Houma
| Supplier | Population served |
|---|---|
| SCHRIEVER WATER TREATMENT SERVICE AREA | 116,460 |
| HOUMA WATER TREATMENT SERVICE AREA | 11,658 |
Frequently asked questions about Houma tap water
Is Houma tap water safe to drink?
EPA testing detected 33 contaminants in the water serving Houma. 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 Houma?
2 public water suppliers report drinking-water monitoring for Houma, Louisiana to the EPA. Each is listed above with its population served.
What contaminants are in Houma's water?
The contaminants EPA monitoring detected in Houma include Nitrate-Nitrite, Fluoride, Copper, Nitrate, TTHM. 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.