What was found in Des Peres'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 |
|---|---|---|---|
| Fluoride | 1738.5 µg/L 43% of the EPA limit 4000 µg/L Main supplier: QUAIL RUN MHP · 897 people · 2017
Highest in the city: 1875.5 µg/L — MAJESTIC LAKES · 512 people · 2017 | 5/5 | SYR4 |
| Copper | 33.54 µg/L 2.6% of the EPA limit 1300 µg/L Main supplier: QUAIL RUN MHP · 897 people · 2017
Highest in the city: 250.2 µg/L — GLEN MEADOWS · 650 people · 2018 | 5/5 | SYR4 |
| Nitrate-Nitrite | 30 µg/L 0.3% of the EPA limit 10000 µg/L Main supplier: QUAIL RUN MHP · 897 people · 2019
Highest in the city: 95 µg/L — GLEN MEADOWS · 650 people · 2019 | 5/5 | SYR4 |
| Barium | 47.65 µg/L 2.4% of the EPA limit 2000 µg/L Main supplier: QUAIL RUN MHP · 897 people · 2017 | 5/5 | SYR4 |
| Gross Alpha, Excl. Radon And U | 18.4 pCi/L 123% of the EPA limit, at the 95th percentile of samples — 15 pCi/L Main supplier: QUAIL RUN MHP · 897 people · 2015 | 1/5 | SYR4 |
| Lead | 1.498 µg/L 10% of the EPA limit 15 µg/L Main supplier: QUAIL RUN MHP · 897 people · 2017
Highest in the city: 8.004 µg/L — MAJESTIC LAKES · 512 people · 2018 | 4/5 | SYR4 |
| Chromium | 4.355 µg/L 4.4% of the EPA limit 100 µg/L Main supplier: QUAIL RUN MHP · 897 people · 2017
Highest in the city: 7.3835 µg/L — MAJESTIC LAKES · 512 people · 2017 | 4/5 | SYR4 |
| TTHM | 7.0935 µg/L 8.9% of the EPA limit 80 µg/L Highest in the city: MAJESTIC LAKES · 512 people · 2019 | 1/5 | SYR4 |
| Combined Radium (-226 And -228) | 5.35 pCi/L 107% of the EPA limit, at the 95th percentile of samples — 5 pCi/L Main supplier: QUAIL RUN MHP · 897 people · 2019 | 4/5 | SYR4 |
| Bromoform | 3.2355 µg/L No EPA limit set Highest in the city: MAJESTIC LAKES · 512 people · 2019 | 2/5 | SYR4 |
| Dibromochloromethane | 2.853 µg/L No EPA limit set Highest in the city: MAJESTIC LAKES · 512 people · 2019 | 2/5 | SYR4 |
| Bromodichloromethane | 2.03 µg/L No EPA limit set Highest in the city: GLEN MEADOWS · 650 people · 2017 | 2/5 | SYR4 |
| Chloroform | 0.9400 µg/L No EPA limit set Highest in the city: GLEN MEADOWS · 650 people · 2017 | 1/5 | SYR4 |
| Lead | 0.0014 mg/L 9.5% of the EPA limit 0.0150 mg/L Main supplier: QUAIL RUN MHP · 897 people · 2023
Highest in the city: 0.0020 mg/L — CONFLUENCE RIVERS FAWN LAKE WATER SYSTEM · 72 people · 2024 | 5/5 | LCR |
Water suppliers serving Des Peres
| Supplier | Population served |
|---|---|
| QUAIL RUN MHP | 897 |
| GLEN MEADOWS | 650 |
| MAJESTIC LAKES | 512 |
| AUBURN LAKE SUBDIVISION | 110 |
| CONFLUENCE RIVERS FAWN LAKE WATER SYSTEM | 72 |
Frequently asked questions about Des Peres tap water
Is Des Peres tap water safe to drink?
EPA testing detected 14 contaminants in the water serving Des Peres. 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 Des Peres?
5 public water suppliers report drinking-water monitoring for Des Peres, Missouri to the EPA. Each is listed above with its population served.
What contaminants are in Des Peres's water?
The contaminants EPA monitoring detected in Des Peres include Fluoride, Copper, Nitrate-Nitrite, Barium, Gross Alpha, Excl. Radon And U. 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.