What was found in Stockton'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 | 423 µg/L 11% of the EPA limit 4000 µg/L Main supplier: STOCKTON PWS · 1,892 people · 2019
Highest in the city: 440 µg/L — AGAPE LAND MANAGEMENT · 250 people · 2019 | 6/7 | SYR4 |
| Nitrate-Nitrite | 10 µg/L 0.1% of the EPA limit 10000 µg/L Main supplier: STOCKTON PWS · 1,892 people · 2019
Highest in the city: 140 µg/L — AGAPE LAND MANAGEMENT · 250 people · 2019 | 6/7 | SYR4 |
| Barium | 120.95 µg/L 6% of the EPA limit 2000 µg/L Main supplier: STOCKTON PWS · 1,892 people · 2019 | 6/7 | SYR4 |
| Copper | 55.195 µg/L 4.2% of the EPA limit 1300 µg/L Main supplier: STOCKTON PWS · 1,892 people · 2019
Highest in the city: 116 µg/L — STOCKTON HILLS WATER CO · 400 people · 2019 | 6/7 | SYR4 |
| Total Haloacetic Acids (HAA5) | 16.2 µg/L 27% of the EPA limit 60 µg/L Main supplier: STOCKTON PWS · 1,892 people · 2019 | 1/7 | SYR4 |
| Gross Alpha, Excl. Radon And U | 10.565 pCi/L 70% of the EPA limit 15 pCi/L Main supplier: STOCKTON PWS · 1,892 people · 2013 | 2/7 | SYR4 |
| Dichloroacetic Acid | 9.99 µg/L No EPA limit set Main supplier: STOCKTON PWS · 1,892 people · 2019 | 1/7 | SYR4 |
| TTHM | 8.215 µg/L 10% of the EPA limit 80 µg/L Main supplier: STOCKTON PWS · 1,892 people · 2019 | 1/7 | SYR4 |
| Lead | 3.625 µg/L 24% of the EPA limit 15 µg/L Main supplier: STOCKTON PWS · 1,892 people · 2019
Highest in the city: 6.498 µg/L — STOCKTON HILLS WATER CO · 400 people · 2019 | 6/7 | SYR4 |
| Trichloroacetic Acid | 6.2 µg/L No EPA limit set Main supplier: STOCKTON PWS · 1,892 people · 2019 | 1/7 | SYR4 |
| Xylenes, Total | 5.825 µg/L 0.1% of the EPA limit 10000 µg/L Highest in the city: VILLAGE OF UMBER VIEW HEIGHTS PWS · 50 people · 2019 | 2/7 | SYR4 |
| Chromium | 2.568 µg/L 2.6% of the EPA limit 100 µg/L Main supplier: STOCKTON PWS · 1,892 people · 2019
Highest in the city: 3.92 µg/L — STOCKTON HILLS WATER CO · 400 people · 2017 | 6/7 | SYR4 |
| Chloroform | 3.735 µg/L No EPA limit set Main supplier: STOCKTON PWS · 1,892 people · 2019 | 4/7 | SYR4 |
| Combined Radium (-226 And -228) | 2.55 pCi/L 51% of the EPA limit 5 pCi/L Main supplier: STOCKTON PWS · 1,892 people · 2017 | 6/7 | SYR4 |
| Bromoform | 2.014 µg/L No EPA limit set Main supplier: STOCKTON PWS · 1,892 people · 2019 | 2/7 | SYR4 |
| Arsenic | 1.98 µg/L 20% of the EPA limit 10 µg/L Main supplier: STOCKTON PWS · 1,892 people · 2019 | 1/7 | SYR4 |
| Dibromochloromethane | 1.682 µg/L No EPA limit set Main supplier: STOCKTON PWS · 1,892 people · 2019 | 3/7 | SYR4 |
| Bromodichloromethane | 1.627 µg/L No EPA limit set Main supplier: STOCKTON PWS · 1,892 people · 2019 | 4/7 | SYR4 |
| Ethylbenzene | 0.8870 µg/L 0.1% of the EPA limit 700 µg/L Highest in the city: FRIENDSHIP HILLS SUBD · 35 people · 2019 | 2/7 | SYR4 |
| 1,2,4-Trichlorobenzene | 0.7000 µg/L 1% of the EPA limit 70 µg/L Highest in the city: FRIENDSHIP HILLS SUBD · 35 people · 2019 | 1/7 | SYR4 |
| Styrene | 0.5800 µg/L 0.6% of the EPA limit 100 µg/L Highest in the city: FRIENDSHIP HILLS SUBD · 35 people · 2019 | 1/7 | SYR4 |
| Lead | 0.0014 mg/L 9.3% of the EPA limit 0.0150 mg/L Main supplier: STOCKTON PWS · 1,892 people · 2023
Highest in the city: 0.0031 mg/L — AGAPE LAND MANAGEMENT · 250 people · 2025 | 7/7 | 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 Stockton
| Supplier | Population served |
|---|---|
| STOCKTON PWS | 1,892 |
| STOCKTON HILLS WATER CO | 400 |
| AGAPE LAND MANAGEMENT | 250 |
| VILLAGE OF UMBER VIEW HEIGHTS PWS | 50 |
| AIRPORT VILLAGE MHP | 42 |
| FRIENDSHIP HILLS SUBD | 35 |
| CHAPEL HILL SUBD | 32 |
Frequently asked questions about Stockton tap water
Is Stockton tap water safe to drink?
EPA testing detected 22 contaminants in the water serving Stockton. 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 Stockton?
7 public water suppliers report drinking-water monitoring for Stockton, Missouri to the EPA. Each is listed above with its population served.
What contaminants are in Stockton's water?
The contaminants EPA monitoring detected in Stockton include Fluoride, Nitrate-Nitrite, Barium, Copper, Total Haloacetic Acids (HAA5). 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.