What was found in ZIP 65257
The level at this ZIP's main supplier, the highest level anywhere in it, the EPA limit for each, and where the figure comes from.
| Contaminant | Level vs EPA limit | Suppliers | Source |
|---|---|---|---|
| Fluoride | 1619 µg/L 40% of the EPA limit 4000 µg/L Highest in the ZIP: BOONE COUNTY PWSD 10 · 4,963 people · 2018 | 1/2 | SYR4 |
| Copper | 863.25 µg/L 66% of the EPA limit 1300 µg/L Main supplier: THOMAS HILL PWSD 1 · 11,250 people · 2018 | 2/2 | SYR4 |
| Lithium | 79.9 µg/L No EPA limit set Highest in the ZIP: BOONE COUNTY PWSD 10 · 4,963 people · 2025 | 1/2 | UCMR-5 |
| TTHM | 70.265 µg/L 88% of the EPA limit 80 µg/L Main supplier: THOMAS HILL PWSD 1 · 11,250 people · 2019 | 1/2 | SYR4 |
| Chloroform | 59.3 µg/L No EPA limit set Main supplier: THOMAS HILL PWSD 1 · 11,250 people · 2019 | 1/2 | SYR4 |
| Total Haloacetic Acids (HAA5) | 54.9 µg/L 91% of the EPA limit 60 µg/L Main supplier: THOMAS HILL PWSD 1 · 11,250 people · 2019 | 1/2 | SYR4 |
| Barium | 35.885 µg/L 1.8% of the EPA limit 2000 µg/L Highest in the ZIP: BOONE COUNTY PWSD 10 · 4,963 people · 2018 | 1/2 | SYR4 |
| Dichloroacetic Acid | 33.435 µg/L No EPA limit set Main supplier: THOMAS HILL PWSD 1 · 11,250 people · 2019 | 2/2 | SYR4 |
| Trichloroacetic Acid | 19.76 µg/L No EPA limit set Main supplier: THOMAS HILL PWSD 1 · 11,250 people · 2019 | 1/2 | SYR4 |
| Nitrate-Nitrite | 17 µg/L 0.2% of the EPA limit 10000 µg/L Highest in the ZIP: BOONE COUNTY PWSD 10 · 4,963 people · 2019 | 1/2 | SYR4 |
| Lead | 15.66 µg/L 104% of the EPA limit, at the 95th percentile of samples — 15 µg/L Main supplier: THOMAS HILL PWSD 1 · 11,250 people · 2018 | 2/2 | SYR4 |
| Bromodichloromethane | 12.865 µg/L No EPA limit set Main supplier: THOMAS HILL PWSD 1 · 11,250 people · 2019 | 1/2 | SYR4 |
| Monobromoacetic Acid | 8.661 µg/L No EPA limit set Main supplier: THOMAS HILL PWSD 1 · 11,250 people · 2019 | 1/2 | SYR4 |
| Dibromochloromethane | 2.75 µg/L No EPA limit set Main supplier: THOMAS HILL PWSD 1 · 11,250 people · 2019 | 1/2 | SYR4 |
| Dibromoacetic Acid | 2.055 µg/L No EPA limit set Main supplier: THOMAS HILL PWSD 1 · 11,250 people · 2019 | 1/2 | SYR4 |
| Combined Radium (-226 And -228) | 1.965 pCi/L 39% of the EPA limit 5 pCi/L Highest in the ZIP: BOONE COUNTY PWSD 10 · 4,963 people · 2019 | 1/2 | SYR4 |
| Pfba | 0.0093 µg/L No EPA limit set Main supplier: THOMAS HILL PWSD 1 · 11,250 people · 2025 | 1/2 | UCMR-5 |
| Lead | 0.0031 mg/L 21% of the EPA limit 0.0150 mg/L Main supplier: THOMAS HILL PWSD 1 · 11,250 people · 2024 | 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.
Water suppliers serving ZIP 65257
| Supplier | State | Population served |
|---|---|---|
| THOMAS HILL PWSD 1 | MO | 11,250 |
| BOONE COUNTY PWSD 10 | MO | 4,963 |
Frequently asked questions about ZIP 65257 tap water
Is the tap water in ZIP 65257 safe to drink?
EPA testing detected 18 contaminants across the water suppliers serving ZIP 65257. A detection isn't the same as a violation — most levels are within federal limits. See each level and source above, and your utility's annual Consumer Confidence Report for the official status.
Which water suppliers serve ZIP 65257?
2 public water suppliers report EPA drinking-water monitoring for ZIP 65257. Each is listed above with its population served.
What contaminants are in ZIP 65257's water?
EPA monitoring detected Fluoride, Copper, Lithium, TTHM, Chloroform, and others across this ZIP's suppliers. The full list with levels and sources is above.