What was found in De Soto'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 | 1152.5 µg/L 29% of the EPA limit 4000 µg/L Main supplier: JEFFERSON COUNTY PWSD 5 · 8,000 people · 2019 | 2/4 | SYR4 |
| Copper | 855.6999999999999 µg/L 66% of the EPA limit 1300 µg/L Main supplier: JEFFERSON COUNTY PWSD 5 · 8,000 people · 2019 | 4/4 | SYR4 |
| Nitrate-Nitrite | 46 µg/L 0.5% of the EPA limit 10000 µg/L Main supplier: JEFFERSON COUNTY PWSD 5 · 8,000 people · 2019
Highest in the city: 210 µg/L — VALLE LAKE SUBD · 625 people · 2019 | 4/4 | SYR4 |
| Barium | 144.5 µg/L 7.2% of the EPA limit 2000 µg/L Main supplier: JEFFERSON COUNTY PWSD 5 · 8,000 people · 2019
Highest in the city: 187.7 µg/L — VALLE LAKE SUBD · 625 people · 2017 | 4/4 | SYR4 |
| Lithium | 27 µg/L No EPA limit set Main supplier: JEFFERSON COUNTY PWSD 5 · 8,000 people · 2024 | 1/4 | UCMR-5 |
| Lead | 11.346499999999995 µg/L 76% of the EPA limit 15 µg/L Main supplier: JEFFERSON COUNTY PWSD 5 · 8,000 people · 2019
Highest in the city: 14.558 µg/L — COUNTRY AIRE ESTATES · 30 people · 2018 | 3/4 | SYR4 |
| Total Haloacetic Acids (HAA5) | 11.1 µg/L 19% of the EPA limit 60 µg/L Highest in the city: VALLE LAKE SUBD · 625 people · 2019 | 1/4 | SYR4 |
| Dichloroacetic Acid | 1.01 µg/L No EPA limit set Main supplier: JEFFERSON COUNTY PWSD 5 · 8,000 people · 2019
Highest in the city: 8.22 µg/L — VALLE LAKE SUBD · 625 people · 2019 | 2/4 | SYR4 |
| Gross Alpha, Excl. Radon And U | 6.619999999999999 pCi/L 44% of the EPA limit 15 pCi/L Main supplier: JEFFERSON COUNTY PWSD 5 · 8,000 people · 2012 | 1/4 | SYR4 |
| TTHM | 3.268 µg/L 4.1% of the EPA limit 80 µg/L Main supplier: JEFFERSON COUNTY PWSD 5 · 8,000 people · 2019
Highest in the city: 6.5275 µg/L — VALLE LAKE SUBD · 625 people · 2019 | 2/4 | SYR4 |
| Chromium | 5.077999999999999 µg/L 5.1% of the EPA limit 100 µg/L Main supplier: JEFFERSON COUNTY PWSD 5 · 8,000 people · 2019 | 4/4 | SYR4 |
| Chloroform | 4.430000000000001 µg/L No EPA limit set Main supplier: JEFFERSON COUNTY PWSD 5 · 8,000 people · 2019 | 2/4 | SYR4 |
| Trichloroacetic Acid | 2.88 µg/L No EPA limit set Highest in the city: VALLE LAKE SUBD · 625 people · 2019 | 1/4 | SYR4 |
| Bromodichloromethane | 2.01 µg/L No EPA limit set Main supplier: JEFFERSON COUNTY PWSD 5 · 8,000 people · 2019 | 2/4 | SYR4 |
| Combined Radium (-226 And -228) | 1.8199999999999998 pCi/L 36% of the EPA limit 5 pCi/L Main supplier: JEFFERSON COUNTY PWSD 5 · 8,000 people · 2016 | 2/4 | SYR4 |
| Arsenic | 1.63 µg/L 16% of the EPA limit 10 µg/L Main supplier: JEFFERSON COUNTY PWSD 5 · 8,000 people · 2019 | 1/4 | SYR4 |
| Dibromochloromethane | 0.7465 µg/L No EPA limit set Main supplier: JEFFERSON COUNTY PWSD 5 · 8,000 people · 2019
Highest in the city: 0.7690 µg/L — VALLE LAKE SUBD · 625 people · 2019 | 2/4 | SYR4 |
| Bromoform | 0.6400 µg/L No EPA limit set Highest in the city: VALLE LAKE SUBD · 625 people · 2019 | 1/4 | SYR4 |
| Mercury | 0.2300 µg/L 12% of the EPA limit 2 µg/L Highest in the city: VALLE LAKE SUBD · 625 people · 2017 | 1/4 | SYR4 |
| Lead | 0.0011 mg/L 7.5% of the EPA limit 0.0150 mg/L Main supplier: JEFFERSON COUNTY PWSD 5 · 8,000 people · 2024
Highest in the city: 0.0024 mg/L — VALLE LAKE SUBD · 625 people · 2025 | 4/4 | 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 De Soto
| Supplier | Population served |
|---|---|
| JEFFERSON COUNTY PWSD 5 | 8,000 |
| VALLE LAKE SUBD | 625 |
| LAKESIDE MANOR | 150 |
| COUNTRY AIRE ESTATES | 30 |
Frequently asked questions about De Soto tap water
Is De Soto tap water safe to drink?
EPA testing detected 20 contaminants in the water serving De Soto. 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 De Soto?
4 public water suppliers report drinking-water monitoring for De Soto, Missouri to the EPA. Each is listed above with its population served.
What contaminants are in De Soto's water?
The contaminants EPA monitoring detected in De Soto include Fluoride, Copper, Nitrate-Nitrite, Barium, Lithium. 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.