What was found in ZIP 63368
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 |
|---|---|---|---|
| Nitrate-Nitrite | 1442.5 µg/L 14% of the EPA limit 10000 µg/L Main supplier: ST CHARLES COUNTY PWSD 2 · 100,587 people · 2019
Highest in the ZIP: 6779 µg/L — CLARK COUNTY CONS PWSD 1 · 7,140 people · 2019 | 2/3 | SYR4 |
| Copper | 64.215 µg/L 4.9% of the EPA limit 1300 µg/L Main supplier: ST CHARLES COUNTY PWSD 2 · 100,587 people · 2019
Highest in the ZIP: 863.25 µg/L — THOMAS HILL PWSD 1 · 11,250 people · 2018 | 3/3 | SYR4 |
| Fluoride | 632 µg/L 16% of the EPA limit 4000 µg/L Main supplier: ST CHARLES COUNTY PWSD 2 · 100,587 people · 2017 | 2/3 | SYR4 |
| Barium | 142.4 µg/L 7.1% of the EPA limit 2000 µg/L Main supplier: ST CHARLES COUNTY PWSD 2 · 100,587 people · 2017 | 2/3 | SYR4 |
| TTHM | 37.695 µg/L 47% of the EPA limit 80 µg/L Main supplier: ST CHARLES COUNTY PWSD 2 · 100,587 people · 2019
Highest in the ZIP: 70.265 µg/L — THOMAS HILL PWSD 1 · 11,250 people · 2019 | 3/3 | SYR4 |
| Chloroform | 25.45 µg/L No EPA limit set Main supplier: ST CHARLES COUNTY PWSD 2 · 100,587 people · 2019
Highest in the ZIP: 59.3 µg/L — THOMAS HILL PWSD 1 · 11,250 people · 2019 | 3/3 | SYR4 |
| Total Haloacetic Acids (HAA5) | 32.56 µg/L 54% of the EPA limit 60 µg/L Main supplier: ST CHARLES COUNTY PWSD 2 · 100,587 people · 2019
Highest in the ZIP: 54.9 µg/L — THOMAS HILL PWSD 1 · 11,250 people · 2019 | 2/3 | SYR4 |
| Lithium | 47.5 µg/L No EPA limit set Main supplier: ST CHARLES COUNTY PWSD 2 · 100,587 people · 2025 | 1/3 | UCMR-5 |
| Dichloroacetic Acid | 29.02 µg/L No EPA limit set Main supplier: ST CHARLES COUNTY PWSD 2 · 100,587 people · 2019
Highest in the ZIP: 33.435 µg/L — THOMAS HILL PWSD 1 · 11,250 people · 2019 | 3/3 | SYR4 |
| Trichloroacetic Acid | 5.1875 µg/L No EPA limit set Main supplier: ST CHARLES COUNTY PWSD 2 · 100,587 people · 2019
Highest in the ZIP: 19.76 µg/L — THOMAS HILL PWSD 1 · 11,250 people · 2019 | 3/3 | SYR4 |
| Lead | 3.45 µg/L 23% of the EPA limit 15 µg/L Main supplier: ST CHARLES COUNTY PWSD 2 · 100,587 people · 2019
Highest in the ZIP: 15.66 µg/L — THOMAS HILL PWSD 1 · 11,250 people · 2018 | 3/3 | SYR4 |
| Bromodichloromethane | 8.97 µg/L No EPA limit set Main supplier: ST CHARLES COUNTY PWSD 2 · 100,587 people · 2019
Highest in the ZIP: 12.865 µg/L — THOMAS HILL PWSD 1 · 11,250 people · 2019 | 3/3 | SYR4 |
| Gross Alpha, Excl. Radon And U | 12.05 pCi/L 80% of the EPA limit 15 pCi/L Main supplier: ST CHARLES COUNTY PWSD 2 · 100,587 people · 2015 | 1/3 | SYR4 |
| Monochloroacetic Acid | 9.7 µg/L No EPA limit set Main supplier: ST CHARLES COUNTY PWSD 2 · 100,587 people · 2019 | 1/3 | SYR4 |
| Monobromoacetic Acid | 8.9625 µg/L No EPA limit set Main supplier: ST CHARLES COUNTY PWSD 2 · 100,587 people · 2019 | 3/3 | SYR4 |
| Dibromochloromethane | 4.556 µg/L No EPA limit set Main supplier: ST CHARLES COUNTY PWSD 2 · 100,587 people · 2019 | 3/3 | SYR4 |
| Combined Radium (-226 And -228) | 3.245 pCi/L 65% of the EPA limit 5 pCi/L Main supplier: ST CHARLES COUNTY PWSD 2 · 100,587 people · 2019 | 1/3 | SYR4 |
| Chromium | 2.404 µg/L 2.4% of the EPA limit 100 µg/L Main supplier: ST CHARLES COUNTY PWSD 2 · 100,587 people · 2017
Highest in the ZIP: 3.0075 µg/L — CLARK COUNTY CONS PWSD 1 · 7,140 people · 2017 | 2/3 | SYR4 |
| Dibromoacetic Acid | 1.871 µg/L No EPA limit set Main supplier: ST CHARLES COUNTY PWSD 2 · 100,587 people · 2019
Highest in the ZIP: 2.055 µg/L — THOMAS HILL PWSD 1 · 11,250 people · 2019 | 3/3 | SYR4 |
| Bromoform | 0.7285 µg/L No EPA limit set Main supplier: ST CHARLES COUNTY PWSD 2 · 100,587 people · 2019
Highest in the ZIP: 0.7725 µg/L — CLARK COUNTY CONS PWSD 1 · 7,140 people · 2019 | 2/3 | SYR4 |
| Atrazine | 0.3300 µg/L 11% of the EPA limit 3 µg/L Main supplier: ST CHARLES COUNTY PWSD 2 · 100,587 people · 2016 | 1/3 | SYR4 |
| Pfba | 0.0065 µg/L No EPA limit set Main supplier: ST CHARLES COUNTY PWSD 2 · 100,587 people · 2025
Highest in the ZIP: 0.0093 µg/L — THOMAS HILL PWSD 1 · 11,250 people · 2025 | 2/3 | UCMR-5 |
| Lead | 0.0 mg/L 0% of the EPA limit 0.0150 mg/L Main supplier: ST CHARLES COUNTY PWSD 2 · 100,587 people · 2025
Highest in the ZIP: 0.0031 mg/L — THOMAS HILL PWSD 1 · 11,250 people · 2024 | 3/3 | 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 63368
| Supplier | State | Population served |
|---|---|---|
| ST CHARLES COUNTY PWSD 2 | MO | 100,587 |
| THOMAS HILL PWSD 1 | MO | 11,250 |
| CLARK COUNTY CONS PWSD 1 | MO | 7,140 |
Frequently asked questions about ZIP 63368 tap water
Is the tap water in ZIP 63368 safe to drink?
EPA testing detected 23 contaminants across the water suppliers serving ZIP 63368. 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 63368?
3 public water suppliers report EPA drinking-water monitoring for ZIP 63368. Each is listed above with its population served.
What contaminants are in ZIP 63368's water?
EPA monitoring detected Nitrate-Nitrite, Copper, Fluoride, Barium, TTHM, and others across this ZIP's suppliers. The full list with levels and sources is above.