What was found in Chesterfield'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 | 2231.5 µg/L 22% of the EPA limit 10000 µg/L Main supplier: MO AMERICAN ST LOUIS ST CHARLES COUNTIES · 1,111,000 people · 2019 | 2/2 | SYR4 |
| Nitrate-Nitrite | 2225 µg/L 22% of the EPA limit 10000 µg/L Main supplier: MO AMERICAN ST LOUIS ST CHARLES COUNTIES · 1,111,000 people · 2019 | 2/2 | SYR4 |
| Fluoride | 760 µg/L 19% of the EPA limit 4000 µg/L Main supplier: MO AMERICAN ST LOUIS ST CHARLES COUNTIES · 1,111,000 people · 2019 | 2/2 | SYR4 |
| Copper | 396.8 µg/L 31% of the EPA limit 1300 µg/L Main supplier: MO AMERICAN ST LOUIS ST CHARLES COUNTIES · 1,111,000 people · 2019
Highest in the city: 712.5 µg/L — MO AMERICAN PEVELY FARMS · 343 people · 2017 | 2/2 | SYR4 |
| Barium | 42.22 µg/L 2.1% of the EPA limit 2000 µg/L Main supplier: MO AMERICAN ST LOUIS ST CHARLES COUNTIES · 1,111,000 people · 2019
Highest in the city: 136.4 µg/L — MO AMERICAN PEVELY FARMS · 343 people · 2017 | 2/2 | SYR4 |
| Nitrite | 100 µg/L 10% of the EPA limit 1000 µg/L Main supplier: MO AMERICAN ST LOUIS ST CHARLES COUNTIES · 1,111,000 people · 2019 | 1/2 | SYR4 |
| Lithium | 86.8 µg/L No EPA limit set Main supplier: MO AMERICAN ST LOUIS ST CHARLES COUNTIES · 1,111,000 people · 2024 | 1/2 | UCMR-5 |
| TTHM | 62.9 µg/L 79% of the EPA limit 80 µg/L Main supplier: MO AMERICAN ST LOUIS ST CHARLES COUNTIES · 1,111,000 people · 2019 | 2/2 | SYR4 |
| Chloroform | 55.56 µg/L No EPA limit set Main supplier: MO AMERICAN ST LOUIS ST CHARLES COUNTIES · 1,111,000 people · 2019 | 2/2 | SYR4 |
| Total Haloacetic Acids (HAA5) | 33.3 µg/L 55% of the EPA limit 60 µg/L Main supplier: MO AMERICAN ST LOUIS ST CHARLES COUNTIES · 1,111,000 people · 2019 | 2/2 | SYR4 |
| Dichloroacetic Acid | 27.7 µg/L No EPA limit set Main supplier: MO AMERICAN ST LOUIS ST CHARLES COUNTIES · 1,111,000 people · 2019 | 2/2 | SYR4 |
| Dibromochloromethane | 5.005 µg/L No EPA limit set Main supplier: MO AMERICAN ST LOUIS ST CHARLES COUNTIES · 1,111,000 people · 2019
Highest in the city: 19.75 µg/L — MO AMERICAN PEVELY FARMS · 343 people · 2017 | 2/2 | SYR4 |
| Bromodichloromethane | 12.4 µg/L No EPA limit set Main supplier: MO AMERICAN ST LOUIS ST CHARLES COUNTIES · 1,111,000 people · 2019
Highest in the city: 14.325 µg/L — MO AMERICAN PEVELY FARMS · 343 people · 2017 | 2/2 | SYR4 |
| Bromoform | 1.025 µg/L No EPA limit set Main supplier: MO AMERICAN ST LOUIS ST CHARLES COUNTIES · 1,111,000 people · 2019
Highest in the city: 12.676 µg/L — MO AMERICAN PEVELY FARMS · 343 people · 2017 | 2/2 | SYR4 |
| Chromium | 1.94 µg/L 1.9% of the EPA limit 100 µg/L Main supplier: MO AMERICAN ST LOUIS ST CHARLES COUNTIES · 1,111,000 people · 2019
Highest in the city: 7.6235 µg/L — MO AMERICAN PEVELY FARMS · 343 people · 2017 | 2/2 | SYR4 |
| Lead | 6.95 µg/L 46% of the EPA limit 15 µg/L Main supplier: MO AMERICAN ST LOUIS ST CHARLES COUNTIES · 1,111,000 people · 2019 | 2/2 | SYR4 |
| Dibromoacetic Acid | 2.7 µg/L No EPA limit set Main supplier: MO AMERICAN ST LOUIS ST CHARLES COUNTIES · 1,111,000 people · 2019
Highest in the city: 6.22 µg/L — MO AMERICAN PEVELY FARMS · 343 people · 2017 | 2/2 | SYR4 |
| Trichloroacetic Acid | 4.6 µg/L No EPA limit set Main supplier: MO AMERICAN ST LOUIS ST CHARLES COUNTIES · 1,111,000 people · 2019 | 2/2 | SYR4 |
| Monobromoacetic Acid | 4.325 µg/L No EPA limit set Main supplier: MO AMERICAN ST LOUIS ST CHARLES COUNTIES · 1,111,000 people · 2019 | 1/2 | SYR4 |
| Monochloroacetic Acid | 3.9 µg/L No EPA limit set Main supplier: MO AMERICAN ST LOUIS ST CHARLES COUNTIES · 1,111,000 people · 2019 | 1/2 | SYR4 |
| Selenium | 3 µg/L 6% of the EPA limit 50 µg/L Main supplier: MO AMERICAN ST LOUIS ST CHARLES COUNTIES · 1,111,000 people · 2019 | 1/2 | SYR4 |
| Arsenic | 1.67 µg/L 17% of the EPA limit 10 µg/L Main supplier: MO AMERICAN ST LOUIS ST CHARLES COUNTIES · 1,111,000 people · 2019 | 1/2 | SYR4 |
| Dichloromethane | 1.1 µg/L 22% of the EPA limit 5 µg/L Main supplier: MO AMERICAN ST LOUIS ST CHARLES COUNTIES · 1,111,000 people · 2019 | 1/2 | SYR4 |
| Di(2-ethylhexyl) Phthalate | 1.085 µg/L 18% of the EPA limit 6 µg/L Main supplier: MO AMERICAN ST LOUIS ST CHARLES COUNTIES · 1,111,000 people · 2019 | 1/2 | SYR4 |
| Atrazine | 0.6100 µg/L 20% of the EPA limit 3 µg/L Main supplier: MO AMERICAN ST LOUIS ST CHARLES COUNTIES · 1,111,000 people · 2019 | 1/2 | SYR4 |
| Diquat | 0.5850 µg/L 2.9% of the EPA limit 20 µg/L Main supplier: MO AMERICAN ST LOUIS ST CHARLES COUNTIES · 1,111,000 people · 2019 | 1/2 | SYR4 |
| Antimony, Total | 0.5000 µg/L 8.3% of the EPA limit 6 µg/L Main supplier: MO AMERICAN ST LOUIS ST CHARLES COUNTIES · 1,111,000 people · 2019 | 1/2 | SYR4 |
| 2,4-D | 0.4200 µg/L 0.6% of the EPA limit 70 µg/L Main supplier: MO AMERICAN ST LOUIS ST CHARLES COUNTIES · 1,111,000 people · 2019 | 1/2 | SYR4 |
| Picloram | 0.2000 µg/L 0% of the EPA limit 500 µg/L Main supplier: MO AMERICAN ST LOUIS ST CHARLES COUNTIES · 1,111,000 people · 2019 | 1/2 | SYR4 |
| Hexachlorocyclopentadiene | 0.1000 µg/L 0.2% of the EPA limit 50 µg/L Main supplier: MO AMERICAN ST LOUIS ST CHARLES COUNTIES · 1,111,000 people · 2019 | 1/2 | SYR4 |
| Benzo(A)Pyrene | 0.0400 µg/L 20% of the EPA limit 0.2000 µg/L Main supplier: MO AMERICAN ST LOUIS ST CHARLES COUNTIES · 1,111,000 people · 2019 | 1/2 | SYR4 |
| Ethylene Dibromide | 0.0200 µg/L 40% of the EPA limit 0.0500 µg/L Main supplier: MO AMERICAN ST LOUIS ST CHARLES COUNTIES · 1,111,000 people · 2019 | 1/2 | SYR4 |
| Pfba | 0.0051 µg/L No EPA limit set Main supplier: MO AMERICAN ST LOUIS ST CHARLES COUNTIES · 1,111,000 people · 2024 | 1/2 | UCMR-5 |
| Lead | 0.0 mg/L 0% of the EPA limit 0.0150 mg/L Main supplier: MO AMERICAN ST LOUIS ST CHARLES COUNTIES · 1,111,000 people · 2025
Highest in the city: 0.0020 mg/L — MO AMERICAN PEVELY FARMS · 343 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 Chesterfield
| Supplier | Population served |
|---|---|
| MO AMERICAN ST LOUIS ST CHARLES COUNTIES | 1,111,000 |
| MO AMERICAN PEVELY FARMS | 343 |
Frequently asked questions about Chesterfield tap water
Is Chesterfield tap water safe to drink?
EPA testing detected 34 contaminants in the water serving Chesterfield. 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 Chesterfield?
2 public water suppliers report drinking-water monitoring for Chesterfield, Missouri to the EPA. Each is listed above with its population served.
What contaminants are in Chesterfield's water?
The contaminants EPA monitoring detected in Chesterfield include Nitrate, Nitrate-Nitrite, Fluoride, Copper, 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.