What was found in Farmington'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 | 2655.5 µg/L 66% of the EPA limit 4000 µg/L Main supplier: FARMINGTON PWS · 18,217 people · 2018 | 2/5 | SYR4 |
| Nitrate-Nitrite | 1770 µg/L 18% of the EPA limit 10000 µg/L Main supplier: FARMINGTON PWS · 18,217 people · 2019 | 4/5 | SYR4 |
| Copper | 209.34999999999997 µg/L 16% of the EPA limit 1300 µg/L Main supplier: FARMINGTON PWS · 18,217 people · 2018
Highest in the city: 768.6999999999999 µg/L — HUNTERS RIDGE SUBD · 441 people · 2018 | 5/5 | SYR4 |
| Barium | 4.629999999999999 µg/L 0.2% of the EPA limit 2000 µg/L Main supplier: FARMINGTON PWS · 18,217 people · 2018
Highest in the city: 69.99 µg/L — FARMINGTON CORRECTIONAL CENTER · 3,500 people · 2018 | 5/5 | SYR4 |
| Gross Alpha, Excl. Radon And U | 18.299999999999976 pCi/L 122% of the EPA limit, at the 95th percentile of samples — 15 pCi/L Main supplier: FARMINGTON PWS · 18,217 people · 2019
Highest in the city: 64.5 pCi/L — HUNTERS RIDGE SUBD · 441 people · 2014 | 4/5 | SYR4 |
| Lead | 14.2 µg/L 95% of the EPA limit 15 µg/L Main supplier: FARMINGTON PWS · 18,217 people · 2018
Highest in the city: 42.5 µg/L — FARMINGTON CORRECTIONAL CENTER · 3,500 people · 2018 | 5/5 | SYR4 |
| TTHM | 21.09 µg/L 26% of the EPA limit 80 µg/L Main supplier: FARMINGTON PWS · 18,217 people · 2019
Highest in the city: 21.37 µg/L — FARMINGTON ASSISTED LIVING CENTER LLC · 75 people · 2018 | 3/5 | SYR4 |
| Combined Uranium | 19.966 µg/L 67% of the EPA limit 30 µg/L Main supplier: FARMINGTON PWS · 18,217 people · 2019 | 2/5 | SYR4 |
| Combined Radium (-226 And -228) | 7.87 pCi/L 157% of the EPA limit, at the 95th percentile of samples — 5 pCi/L Main supplier: FARMINGTON PWS · 18,217 people · 2019
Highest in the city: 12.879999999999995 pCi/L — HUNTERS RIDGE SUBD · 441 people · 2019 | 4/5 | SYR4 |
| Bromoform | 11.349999999999998 µg/L No EPA limit set Main supplier: FARMINGTON PWS · 18,217 people · 2019 | 2/5 | SYR4 |
| Dibromochloromethane | 4.8534999999999995 µg/L No EPA limit set Main supplier: FARMINGTON PWS · 18,217 people · 2019
Highest in the city: 8.565999999999999 µg/L — FARMINGTON ASSISTED LIVING CENTER LLC · 75 people · 2018 | 3/5 | SYR4 |
| Bromodichloromethane | 4.847999999999999 µg/L No EPA limit set Main supplier: FARMINGTON PWS · 18,217 people · 2019
Highest in the city: 7.353999999999999 µg/L — FARMINGTON ASSISTED LIVING CENTER LLC · 75 people · 2018 | 3/5 | SYR4 |
| Chromium | 3.7800000000000002 µg/L 3.8% of the EPA limit 100 µg/L Main supplier: FARMINGTON PWS · 18,217 people · 2018
Highest in the city: 7.079999999999999 µg/L — FARMINGTON CORRECTIONAL CENTER · 3,500 people · 2018 | 5/5 | SYR4 |
| Dichloroacetic Acid | 6.809 µg/L No EPA limit set Main supplier: FARMINGTON PWS · 18,217 people · 2019 | 3/5 | SYR4 |
| Chloroform | 5.345999999999998 µg/L No EPA limit set Main supplier: FARMINGTON PWS · 18,217 people · 2019 | 4/5 | SYR4 |
| Arsenic | 2.866 µg/L 29% of the EPA limit 10 µg/L Main supplier: FARMINGTON PWS · 18,217 people · 2018 | 1/5 | SYR4 |
| Dibromoacetic Acid | 2.6105 µg/L No EPA limit set Main supplier: FARMINGTON PWS · 18,217 people · 2019 | 2/5 | SYR4 |
| Total Haloacetic Acids (HAA5) | 1.72 µg/L 2.9% of the EPA limit 60 µg/L Highest in the city: HUNTERS RIDGE SUBD · 441 people · 2019 | 1/5 | SYR4 |
| Tetrachloroethylene | 1.4925 µg/L 30% of the EPA limit 5 µg/L Highest in the city: FARMINGTON CORRECTIONAL CENTER · 3,500 people · 2019 | 1/5 | SYR4 |
| Xylenes, Total | 1.2875 µg/L 0% of the EPA limit 10000 µg/L Highest in the city: FARMINGTON CORRECTIONAL CENTER · 3,500 people · 2019 | 1/5 | SYR4 |
| Mercury | 1.268 µg/L 63% of the EPA limit 2 µg/L Highest in the city: FARMINGTON ASSISTED LIVING CENTER LLC · 75 people · 2019 | 1/5 | SYR4 |
| Trichloroacetic Acid | 0.9400 µg/L No EPA limit set Highest in the city: FARMINGTON ASSISTED LIVING CENTER LLC · 75 people · 2018 | 1/5 | SYR4 |
| Toluene | 0.6200 µg/L 0.1% of the EPA limit 1000 µg/L Main supplier: FARMINGTON PWS · 18,217 people · 2018 | 1/5 | SYR4 |
| Lead | 0.0048 mg/L 32% of the EPA limit 0.0150 mg/L Main supplier: FARMINGTON PWS · 18,217 people · 2024
Highest in the city: 0.0077 mg/L — FARMINGTON ASSISTED LIVING CENTER LLC · 75 people · 2025 | 5/5 | LCR |
| PFHXS | 0.0048 µg/L No EPA limit set Main supplier: FARMINGTON PWS · 18,217 people · 2025 | 1/5 | UCMR-5 |
| Pfpea | 0.0038 µg/L No EPA limit set Main supplier: FARMINGTON PWS · 18,217 people · 2025 | 1/5 | UCMR-5 |
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 Farmington
| Supplier | Population served |
|---|---|
| FARMINGTON PWS | 18,217 |
| FARMINGTON CORRECTIONAL CENTER | 3,500 |
| PILOT KNOB RURAL WD 1 DOE RUN AREA | 507 |
| HUNTERS RIDGE SUBD | 441 |
| FARMINGTON ASSISTED LIVING CENTER LLC | 75 |
Frequently asked questions about Farmington tap water
Is Farmington tap water safe to drink?
EPA testing detected 26 contaminants in the water serving Farmington. 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 Farmington?
5 public water suppliers report drinking-water monitoring for Farmington, Missouri to the EPA. Each is listed above with its population served.
What contaminants are in Farmington's water?
The contaminants EPA monitoring detected in Farmington include Fluoride, Nitrate-Nitrite, Copper, 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.