What was found in Donaldsonville'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 | 2100 µg/L 21% of the EPA limit 10000 µg/L Main supplier: PARISH UTILITIES OF ASCENSION · 9,732 people · 2019 | 1/2 | SYR4 |
| Copper | 600 µg/L 46% of the EPA limit 1300 µg/L Main supplier: PARISH UTILITIES OF ASCENSION · 9,732 people · 2019
Highest in the city: 980 µg/L — ASCENSION CONSOLIDATED UTILITY DIST 1 · 2,229 people · 2018 | 2/2 | SYR4 |
| Fluoride | 200 µg/L 5% of the EPA limit 4000 µg/L Main supplier: PARISH UTILITIES OF ASCENSION · 9,732 people · 2019 | 1/2 | SYR4 |
| TTHM | 78.4 µg/L 98% of the EPA limit 80 µg/L Main supplier: PARISH UTILITIES OF ASCENSION · 9,732 people · 2019
Highest in the city: 100.11 µg/L — ASCENSION CONSOLIDATED UTILITY DIST 1 · 2,229 people · 2019 | 2/2 | SYR4 |
| Chloroform | 62.4 µg/L No EPA limit set Main supplier: PARISH UTILITIES OF ASCENSION · 9,732 people · 2019
Highest in the city: 88.26 µg/L — ASCENSION CONSOLIDATED UTILITY DIST 1 · 2,229 people · 2019 | 2/2 | SYR4 |
| Total Haloacetic Acids (HAA5) | 70.915 µg/L 118% of the EPA limit, at the 95th percentile of samples — 60 µg/L Main supplier: PARISH UTILITIES OF ASCENSION · 9,732 people · 2019
Highest in the city: 75.125 µg/L — ASCENSION CONSOLIDATED UTILITY DIST 1 · 2,229 people · 2019 | 2/2 | SYR4 |
| Barium | 55.3 µg/L 2.8% of the EPA limit 2000 µg/L Main supplier: PARISH UTILITIES OF ASCENSION · 9,732 people · 2019 | 1/2 | SYR4 |
| Trichloroacetic Acid | 33.8 µg/L No EPA limit set Main supplier: PARISH UTILITIES OF ASCENSION · 9,732 people · 2019
Highest in the city: 51.05 µg/L — ASCENSION CONSOLIDATED UTILITY DIST 1 · 2,229 people · 2019 | 2/2 | SYR4 |
| Dalapon | 38.2061 µg/L 19% of the EPA limit 200 µg/L Main supplier: PARISH UTILITIES OF ASCENSION · 9,732 people · 2019 | 1/2 | SYR4 |
| Dichloroacetic Acid | 33.175 µg/L No EPA limit set Main supplier: PARISH UTILITIES OF ASCENSION · 9,732 people · 2019 | 2/2 | SYR4 |
| Bromodichloromethane | 18.599 µg/L No EPA limit set Main supplier: PARISH UTILITIES OF ASCENSION · 9,732 people · 2019
Highest in the city: 23.3 µg/L — ASCENSION CONSOLIDATED UTILITY DIST 1 · 2,229 people · 2019 | 2/2 | SYR4 |
| Monochloroacetic Acid | 18 µg/L No EPA limit set Main supplier: PARISH UTILITIES OF ASCENSION · 9,732 people · 2019 | 2/2 | SYR4 |
| Lead | 3.95 µg/L 26% of the EPA limit 15 µg/L Main supplier: PARISH UTILITIES OF ASCENSION · 9,732 people · 2019
Highest in the city: 14.4 µg/L — ASCENSION CONSOLIDATED UTILITY DIST 1 · 2,229 people · 2018 | 2/2 | SYR4 |
| Lithium | 13.1 µg/L No EPA limit set Main supplier: PARISH UTILITIES OF ASCENSION · 9,732 people · 2023 | 1/2 | UCMR-5 |
| Dibromochloromethane | 10 µg/L No EPA limit set Main supplier: PARISH UTILITIES OF ASCENSION · 9,732 people · 2019 | 2/2 | SYR4 |
| Bromoform | 7.85 µg/L No EPA limit set Main supplier: PARISH UTILITIES OF ASCENSION · 9,732 people · 2019 | 1/2 | SYR4 |
| Gross Beta Particle Activity | 4.56 pCi/L No EPA limit set Main supplier: PARISH UTILITIES OF ASCENSION · 9,732 people · 2019 | 1/2 | SYR4 |
| Dibromoacetic Acid | 2 µg/L No EPA limit set Main supplier: PARISH UTILITIES OF ASCENSION · 9,732 people · 2019 | 2/2 | SYR4 |
| Monobromoacetic Acid | 1.6 µg/L No EPA limit set Main supplier: PARISH UTILITIES OF ASCENSION · 9,732 people · 2019 | 2/2 | SYR4 |
| Arsenic | 1 µg/L 10% of the EPA limit 10 µg/L Main supplier: PARISH UTILITIES OF ASCENSION · 9,732 people · 2019 | 1/2 | SYR4 |
| Di(2-ethylhexyl) Phthalate | 0.9300 µg/L 16% of the EPA limit 6 µg/L Main supplier: PARISH UTILITIES OF ASCENSION · 9,732 people · 2019 | 1/2 | SYR4 |
| Simazine | 0.8700 µg/L 22% of the EPA limit 4 µg/L Main supplier: PARISH UTILITIES OF ASCENSION · 9,732 people · 2019 | 1/2 | SYR4 |
| Di(2-ethylhexyl) Adipate | 0.7500 µg/L 0.2% of the EPA limit 400 µg/L Main supplier: PARISH UTILITIES OF ASCENSION · 9,732 people · 2019 | 1/2 | SYR4 |
| Combined Radium (-226 And -228) | 0.7174 pCi/L 14% of the EPA limit 5 pCi/L Main supplier: PARISH UTILITIES OF ASCENSION · 9,732 people · 2019 | 1/2 | SYR4 |
| Carbon Tetrachloride | 0.6000 µg/L 12% of the EPA limit 5 µg/L Main supplier: PARISH UTILITIES OF ASCENSION · 9,732 people · 2019 | 1/2 | SYR4 |
| Selenium | 0.5900 µg/L 1.2% of the EPA limit 50 µg/L Main supplier: PARISH UTILITIES OF ASCENSION · 9,732 people · 2019 | 1/2 | SYR4 |
| P-Dichlorobenzene | 0.5200 µg/L 0.7% of the EPA limit 75 µg/L Main supplier: PARISH UTILITIES OF ASCENSION · 9,732 people · 2019 | 1/2 | SYR4 |
| Atrazine | 0.2770 µg/L 9.2% of the EPA limit 3 µg/L Main supplier: PARISH UTILITIES OF ASCENSION · 9,732 people · 2019 | 1/2 | SYR4 |
| 2,4-D | 0.1000 µg/L 0.1% of the EPA limit 70 µg/L Main supplier: PARISH UTILITIES OF ASCENSION · 9,732 people · 2019 | 1/2 | SYR4 |
| Hexachlorocyclopentadiene | 0.0400 µg/L 0.1% of the EPA limit 50 µg/L Main supplier: PARISH UTILITIES OF ASCENSION · 9,732 people · 2019 | 1/2 | SYR4 |
| Pfba | 0.0067 µg/L No EPA limit set Main supplier: PARISH UTILITIES OF ASCENSION · 9,732 people · 2024 | 1/2 | UCMR-5 |
| PFBS | 0.0047 µg/L No EPA limit set Main supplier: PARISH UTILITIES OF ASCENSION · 9,732 people · 2024 | 1/2 | UCMR-5 |
| PFOS | 0.0045 µg/L No EPA limit set Main supplier: PARISH UTILITIES OF ASCENSION · 9,732 people · 2024 | 1/2 | UCMR-5 |
| Lead | 0.0010 mg/L 6.7% of the EPA limit 0.0150 mg/L Main supplier: PARISH UTILITIES OF ASCENSION · 9,732 people · 2023 | 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 Donaldsonville
| Supplier | Population served |
|---|---|
| PARISH UTILITIES OF ASCENSION | 9,732 |
| ASCENSION CONSOLIDATED UTILITY DIST 1 | 2,229 |
Frequently asked questions about Donaldsonville tap water
Is Donaldsonville tap water safe to drink?
EPA testing detected 34 contaminants in the water serving Donaldsonville. 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 Donaldsonville?
2 public water suppliers report drinking-water monitoring for Donaldsonville, Louisiana to the EPA. Each is listed above with its population served.
What contaminants are in Donaldsonville's water?
The contaminants EPA monitoring detected in Donaldsonville include Nitrate-Nitrite, Copper, Fluoride, 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.