What was found in Napoleonville'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 | 2085 µg/L 21% of the EPA limit 10000 µg/L Main supplier: ASSUMPTION PARISH WW DISTRICT 1 · 21,366 people · 2019 | 1/1 | SYR4 |
| Fluoride | 860 µg/L 22% of the EPA limit 4000 µg/L Main supplier: ASSUMPTION PARISH WW DISTRICT 1 · 21,366 people · 2019 | 1/1 | SYR4 |
| Copper | 710 µg/L 55% of the EPA limit 1300 µg/L Main supplier: ASSUMPTION PARISH WW DISTRICT 1 · 21,366 people · 2019 | 1/1 | SYR4 |
| TTHM | 115.32 µg/L 144% of the EPA limit, at the 95th percentile of samples — 80 µg/L Main supplier: ASSUMPTION PARISH WW DISTRICT 1 · 21,366 people · 2019 | 1/1 | SYR4 |
| Chloroform | 90.575 µg/L No EPA limit set Main supplier: ASSUMPTION PARISH WW DISTRICT 1 · 21,366 people · 2019 | 1/1 | SYR4 |
| Total Haloacetic Acids (HAA5) | 74.475 µg/L 124% of the EPA limit, at the 95th percentile of samples — 60 µg/L Main supplier: ASSUMPTION PARISH WW DISTRICT 1 · 21,366 people · 2019 | 1/1 | SYR4 |
| Barium | 57.8 µg/L 2.9% of the EPA limit 2000 µg/L Main supplier: ASSUMPTION PARISH WW DISTRICT 1 · 21,366 people · 2019 | 1/1 | SYR4 |
| Dalapon | 47.32 µg/L 24% of the EPA limit 200 µg/L Main supplier: ASSUMPTION PARISH WW DISTRICT 1 · 21,366 people · 2019 | 1/1 | SYR4 |
| Trichloroacetic Acid | 40.75 µg/L No EPA limit set Main supplier: ASSUMPTION PARISH WW DISTRICT 1 · 21,366 people · 2019 | 1/1 | SYR4 |
| Dichloroacetic Acid | 31.95 µg/L No EPA limit set Main supplier: ASSUMPTION PARISH WW DISTRICT 1 · 21,366 people · 2019 | 1/1 | SYR4 |
| Bromodichloromethane | 23.49 µg/L No EPA limit set Main supplier: ASSUMPTION PARISH WW DISTRICT 1 · 21,366 people · 2019 | 1/1 | SYR4 |
| Lithium | 15.7 µg/L No EPA limit set Main supplier: ASSUMPTION PARISH WW DISTRICT 1 · 21,366 people · 2024 | 1/1 | UCMR-5 |
| Monochloroacetic Acid | 9.1 µg/L No EPA limit set Main supplier: ASSUMPTION PARISH WW DISTRICT 1 · 21,366 people · 2019 | 1/1 | SYR4 |
| Dibromochloromethane | 7.58 µg/L No EPA limit set Main supplier: ASSUMPTION PARISH WW DISTRICT 1 · 21,366 people · 2019 | 1/1 | SYR4 |
| Monobromoacetic Acid | 6.535 µg/L No EPA limit set Main supplier: ASSUMPTION PARISH WW DISTRICT 1 · 21,366 people · 2019 | 1/1 | SYR4 |
| Gross Beta Particle Activity | 4 pCi/L No EPA limit set Main supplier: ASSUMPTION PARISH WW DISTRICT 1 · 21,366 people · 2019 | 1/1 | SYR4 |
| Arsenic | 3.35 µg/L 34% of the EPA limit 10 µg/L Main supplier: ASSUMPTION PARISH WW DISTRICT 1 · 21,366 people · 2019 | 1/1 | SYR4 |
| Dibromoacetic Acid | 2 µg/L No EPA limit set Main supplier: ASSUMPTION PARISH WW DISTRICT 1 · 21,366 people · 2019 | 1/1 | SYR4 |
| Lead | 2 µg/L 13% of the EPA limit 15 µg/L Main supplier: ASSUMPTION PARISH WW DISTRICT 1 · 21,366 people · 2019 | 1/1 | SYR4 |
| Combined Uranium | 1.49 µg/L 5% of the EPA limit 30 µg/L Main supplier: ASSUMPTION PARISH WW DISTRICT 1 · 21,366 people · 2017 | 1/1 | SYR4 |
| Di(2-ethylhexyl) Phthalate | 1.1545 µg/L 19% of the EPA limit 6 µg/L Main supplier: ASSUMPTION PARISH WW DISTRICT 1 · 21,366 people · 2019 | 1/1 | SYR4 |
| Carbon Tetrachloride | 1.03 µg/L 21% of the EPA limit 5 µg/L Main supplier: ASSUMPTION PARISH WW DISTRICT 1 · 21,366 people · 2019 | 1/1 | SYR4 |
| Combined Radium (-226 And -228) | 0.9390 pCi/L 19% of the EPA limit 5 pCi/L Main supplier: ASSUMPTION PARISH WW DISTRICT 1 · 21,366 people · 2019 | 1/1 | SYR4 |
| Simazine | 0.7650 µg/L 19% of the EPA limit 4 µg/L Main supplier: ASSUMPTION PARISH WW DISTRICT 1 · 21,366 people · 2019 | 1/1 | SYR4 |
| Bromoform | 0.6430 µg/L No EPA limit set Main supplier: ASSUMPTION PARISH WW DISTRICT 1 · 21,366 people · 2019 | 1/1 | SYR4 |
| Selenium | 0.5800 µg/L 1.2% of the EPA limit 50 µg/L Main supplier: ASSUMPTION PARISH WW DISTRICT 1 · 21,366 people · 2019 | 1/1 | SYR4 |
| Atrazine | 0.3500 µg/L 12% of the EPA limit 3 µg/L Main supplier: ASSUMPTION PARISH WW DISTRICT 1 · 21,366 people · 2019 | 1/1 | SYR4 |
| Hexachlorocyclopentadiene | 0.0569 µg/L 0.1% of the EPA limit 50 µg/L Main supplier: ASSUMPTION PARISH WW DISTRICT 1 · 21,366 people · 2019 | 1/1 | SYR4 |
| 6:2 Fts | 0.0150 µg/L No EPA limit set Main supplier: ASSUMPTION PARISH WW DISTRICT 1 · 21,366 people · 2024 | 1/1 | UCMR-5 |
| Pfba | 0.0061 µg/L No EPA limit set Main supplier: ASSUMPTION PARISH WW DISTRICT 1 · 21,366 people · 2024 | 1/1 | UCMR-5 |
| Lead | 0.0020 mg/L 13% of the EPA limit 0.0150 mg/L Main supplier: ASSUMPTION PARISH WW DISTRICT 1 · 21,366 people · 2023 | 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 Napoleonville
| Supplier | Population served |
|---|---|
| ASSUMPTION PARISH WW DISTRICT 1 | 21,366 |
Frequently asked questions about Napoleonville tap water
Is Napoleonville tap water safe to drink?
EPA testing detected 31 contaminants in the water serving Napoleonville. 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 Napoleonville?
1 public water supplier report drinking-water monitoring for Napoleonville, Louisiana to the EPA. Each is listed above with its population served.
What contaminants are in Napoleonville's water?
The contaminants EPA monitoring detected in Napoleonville include Nitrate-Nitrite, Fluoride, 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.