What was found in Chalmette'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 | 3400 µg/L 34% of the EPA limit 10000 µg/L Main supplier: ST BERNARD PARISH WATERWORKS · 44,783 people · 2015 | 1/1 | SYR4 |
| Nitrate-Nitrite | 3355 µg/L 34% of the EPA limit 10000 µg/L Main supplier: ST BERNARD PARISH WATERWORKS · 44,783 people · 2019 | 1/1 | SYR4 |
| Copper | 900 µg/L 69% of the EPA limit 1300 µg/L Main supplier: ST BERNARD PARISH WATERWORKS · 44,783 people · 2019 | 1/1 | SYR4 |
| Fluoride | 260 µg/L 6.5% of the EPA limit 4000 µg/L Main supplier: ST BERNARD PARISH WATERWORKS · 44,783 people · 2019 | 1/1 | SYR4 |
| TTHM | 103.64 µg/L 130% of the EPA limit, at the 95th percentile of samples — 80 µg/L Main supplier: ST BERNARD PARISH WATERWORKS · 44,783 people · 2019 | 1/1 | SYR4 |
| Total Haloacetic Acids (HAA5) | 69.48 µg/L 116% of the EPA limit, at the 95th percentile of samples — 60 µg/L Main supplier: ST BERNARD PARISH WATERWORKS · 44,783 people · 2019 | 1/1 | SYR4 |
| Chloroform | 66.36 µg/L No EPA limit set Main supplier: ST BERNARD PARISH WATERWORKS · 44,783 people · 2019 | 1/1 | SYR4 |
| Barium | 57.4 µg/L 2.9% of the EPA limit 2000 µg/L Main supplier: ST BERNARD PARISH WATERWORKS · 44,783 people · 2019 | 1/1 | SYR4 |
| Trichloroacetic Acid | 39.125 µg/L No EPA limit set Main supplier: ST BERNARD PARISH WATERWORKS · 44,783 people · 2019 | 1/1 | SYR4 |
| Dichloroacetic Acid | 31.26 µg/L No EPA limit set Main supplier: ST BERNARD PARISH WATERWORKS · 44,783 people · 2019 | 1/1 | SYR4 |
| Bromodichloromethane | 25.35 µg/L No EPA limit set Main supplier: ST BERNARD PARISH WATERWORKS · 44,783 people · 2019 | 1/1 | SYR4 |
| Monochloroacetic Acid | 20.2 µg/L No EPA limit set Main supplier: ST BERNARD PARISH WATERWORKS · 44,783 people · 2019 | 1/1 | SYR4 |
| Monobromoacetic Acid | 18.54 µg/L No EPA limit set Main supplier: ST BERNARD PARISH WATERWORKS · 44,783 people · 2019 | 1/1 | SYR4 |
| Dalapon | 14.402 µg/L 7.2% of the EPA limit 200 µg/L Main supplier: ST BERNARD PARISH WATERWORKS · 44,783 people · 2019 | 1/1 | SYR4 |
| Dibromochloromethane | 8.175 µg/L No EPA limit set Main supplier: ST BERNARD PARISH WATERWORKS · 44,783 people · 2019 | 1/1 | SYR4 |
| Gross Beta Particle Activity | 4.616 pCi/L No EPA limit set Main supplier: ST BERNARD PARISH WATERWORKS · 44,783 people · 2019 | 1/1 | SYR4 |
| Dibromoacetic Acid | 3.96 µg/L No EPA limit set Main supplier: ST BERNARD PARISH WATERWORKS · 44,783 people · 2019 | 1/1 | SYR4 |
| Chromium | 3.7 µg/L 3.7% of the EPA limit 100 µg/L Main supplier: ST BERNARD PARISH WATERWORKS · 44,783 people · 2019 | 1/1 | SYR4 |
| Lead | 3 µg/L 20% of the EPA limit 15 µg/L Main supplier: ST BERNARD PARISH WATERWORKS · 44,783 people · 2019 | 1/1 | SYR4 |
| Bromoform | 2.7 µg/L No EPA limit set Main supplier: ST BERNARD PARISH WATERWORKS · 44,783 people · 2019 | 1/1 | SYR4 |
| Arsenic | 1.8 µg/L 18% of the EPA limit 10 µg/L Main supplier: ST BERNARD PARISH WATERWORKS · 44,783 people · 2019 | 1/1 | SYR4 |
| Combined Uranium | 1.49 µg/L 5% of the EPA limit 30 µg/L Main supplier: ST BERNARD PARISH WATERWORKS · 44,783 people · 2017 | 1/1 | SYR4 |
| Di(2-ethylhexyl) Phthalate | 0.9250 µg/L 15% of the EPA limit 6 µg/L Main supplier: ST BERNARD PARISH WATERWORKS · 44,783 people · 2019 | 1/1 | SYR4 |
| Simazine | 0.8200 µg/L 21% of the EPA limit 4 µg/L Main supplier: ST BERNARD PARISH WATERWORKS · 44,783 people · 2019 | 1/1 | SYR4 |
| Selenium | 0.6100 µg/L 1.2% of the EPA limit 50 µg/L Main supplier: ST BERNARD PARISH WATERWORKS · 44,783 people · 2019 | 1/1 | SYR4 |
| Toluene | 0.5200 µg/L 0.1% of the EPA limit 1000 µg/L Main supplier: ST BERNARD PARISH WATERWORKS · 44,783 people · 2019 | 1/1 | SYR4 |
| Atrazine | 0.4160 µg/L 14% of the EPA limit 3 µg/L Main supplier: ST BERNARD PARISH WATERWORKS · 44,783 people · 2019 | 1/1 | SYR4 |
| Pentachlorophenol | 0.0380 µg/L 3.8% of the EPA limit 1 µg/L Main supplier: ST BERNARD PARISH WATERWORKS · 44,783 people · 2019 | 1/1 | SYR4 |
| Lead | 0.0024 mg/L 16% of the EPA limit 0.0150 mg/L Main supplier: ST BERNARD PARISH WATERWORKS · 44,783 people · 2025 | 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 Chalmette
| Supplier | Population served |
|---|---|
| ST BERNARD PARISH WATERWORKS | 44,783 |
Frequently asked questions about Chalmette tap water
Is Chalmette tap water safe to drink?
EPA testing detected 29 contaminants in the water serving Chalmette. 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 Chalmette?
1 public water supplier report drinking-water monitoring for Chalmette, Louisiana to the EPA. Each is listed above with its population served.
What contaminants are in Chalmette's water?
The contaminants EPA monitoring detected in Chalmette include Nitrate, Nitrate-Nitrite, Copper, Fluoride, 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.