What was found in ZIP 63109
The highest level seen across the suppliers serving this ZIP, the EPA limit for each, and where the figure comes from.
| Contaminant | Level vs EPA limit | Suppliers | Source |
|---|---|---|---|
| Nitrate-Nitrite | 7900 µg/L 79% of the EPA limit 10000 µg/L | 2/3 | SYR4 |
| Nitrate | 4120 µg/L 41% of the EPA limit 10000 µg/L | 1/3 | SYR4 |
| Copper | 1120 µg/L 86% of the EPA limit 1300 µg/L | 3/3 | SYR4 |
| Fluoride | 650 µg/L 16% of the EPA limit 4000 µg/L | 2/3 | SYR4 |
| TTHM | 82 µg/L 102% of the EPA limit, in the worst sample — 80 µg/L | 3/3 | SYR4 |
| Chloroform | 68.3 µg/L No EPA limit set | 3/3 | SYR4 |
| Total Haloacetic Acids (HAA5) | 57.4 µg/L 96% of the EPA limit 60 µg/L | 2/3 | SYR4 |
| Barium | 54.2 µg/L 2.7% of the EPA limit 2000 µg/L | 2/3 | SYR4 |
| Lithium | 45.3 µg/L No EPA limit set | 1/3 | UCMR-5 |
| Nitrite | 39.5 µg/L 4% of the EPA limit 1000 µg/L | 1/3 | SYR4 |
| Dichloroacetic Acid | 37.1 µg/L No EPA limit set | 3/3 | SYR4 |
| Lead | 31.5 µg/L 210% of the EPA limit, in the worst sample — 15 µg/L | 3/3 | SYR4 |
| Trichloroacetic Acid | 24.3 µg/L No EPA limit set | 3/3 | SYR4 |
| Bromodichloromethane | 13.5 µg/L No EPA limit set | 3/3 | SYR4 |
| Monobromoacetic Acid | 9.2 µg/L No EPA limit set | 3/3 | SYR4 |
| Monochloroacetic Acid | 7.009 µg/L No EPA limit set | 1/3 | SYR4 |
| Dibromochloromethane | 3.69 µg/L No EPA limit set | 3/3 | SYR4 |
| Chromium | 3.01 µg/L 3% of the EPA limit 100 µg/L | 2/3 | SYR4 |
| Dibromoacetic Acid | 2.972 µg/L No EPA limit set | 3/3 | SYR4 |
| Selenium | 2.588 µg/L 5.2% of the EPA limit 50 µg/L | 1/3 | SYR4 |
| Atrazine | 1.56 µg/L 52% of the EPA limit 3 µg/L | 1/3 | SYR4 |
| Arsenic | 1.12 µg/L 11% of the EPA limit 10 µg/L | 1/3 | SYR4 |
| Simazine | 1.08 µg/L 27% of the EPA limit 4 µg/L | 1/3 | SYR4 |
| Bromoform | 0.7800 µg/L No EPA limit set | 1/3 | SYR4 |
| Antimony, Total | 0.3900 µg/L 6.5% of the EPA limit 6 µg/L | 1/3 | SYR4 |
| Pfba | 0.0093 µg/L No EPA limit set | 1/3 | UCMR-5 |
| Lead | 0.0031 mg/L 21% of the EPA limit 0.0150 mg/L | 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 single worst sample on
record — over 100% is worth reading, but is not by itself a violation.
Formal violations are listed separately.
Water suppliers serving ZIP 63109
| Supplier | State | Population served |
|---|---|---|
| ST LOUIS CITY PWS | MO | 304,709 |
| THOMAS HILL PWSD 1 | MO | 11,250 |
| CLARK COUNTY CONS PWSD 1 | MO | 7,140 |
Frequently asked questions about ZIP 63109 tap water
Is the tap water in ZIP 63109 safe to drink?
EPA testing detected 27 contaminants across the water suppliers serving ZIP 63109. 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 63109?
3 public water suppliers report EPA drinking-water monitoring for ZIP 63109. Each is listed above with its population served.
What contaminants are in ZIP 63109's water?
EPA monitoring detected Nitrate-Nitrite, Nitrate, Copper, Fluoride, TTHM, and others across this ZIP's suppliers. The full list with levels and sources is above.