What was found in ZIP 57201
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 | 3200 µg/L 32% of the EPA limit 10000 µg/L | 1/3 | SYR4 |
| Copper | 1570 µg/L 121% of the EPA limit, in the worst sample — 1300 µg/L | 3/3 | SYR4 |
| TTHM | 142 µg/L 178% of the EPA limit, in the worst sample — 80 µg/L | 3/3 | SYR4 |
| Barium | 105 µg/L 5.3% of the EPA limit 2000 µg/L | 3/3 | SYR4 |
| Total Haloacetic Acids (HAA5) | 95 µg/L 158% of the EPA limit, in the worst sample — 60 µg/L | 3/3 | SYR4 |
| Nitrite | 60 µg/L 6% of the EPA limit 1000 µg/L | 1/3 | SYR4 |
| Lithium | 55.7 µg/L No EPA limit set | 3/3 | UCMR-5 |
| Lead | 19.5 µg/L 130% of the EPA limit, in the worst sample — 15 µg/L | 3/3 | SYR4 |
| Chromium | 9.7 µg/L 9.7% of the EPA limit 100 µg/L | 3/3 | SYR4 |
| Gross Alpha, Excl. Radon And U | 6.8 pCi/L 45% of the EPA limit 15 pCi/L | 1/3 | SYR4 |
| Arsenic | 4 µg/L 40% of the EPA limit 10 µg/L | 2/3 | SYR4 |
| Selenium | 2.8 µg/L 5.6% of the EPA limit 50 µg/L | 3/3 | SYR4 |
| Antimony, Total | 0.4000 µg/L 6.7% of the EPA limit 6 µg/L | 1/3 | SYR4 |
| Lead | 0.0040 mg/L 27% 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 57201
| Supplier | State | Population served |
|---|---|---|
| WATERTOWN MUNICIPAL UTILITIES | SD | 23,230 |
| GRANT-ROBERTS RURAL WATER SYSTEM | SD | 5,050 |
| SIOUX RURAL WATER SYSTEM | SD | 4,280 |
Frequently asked questions about ZIP 57201 tap water
Is the tap water in ZIP 57201 safe to drink?
EPA testing detected 14 contaminants across the water suppliers serving ZIP 57201. 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 57201?
3 public water suppliers report EPA drinking-water monitoring for ZIP 57201. Each is listed above with its population served.
What contaminants are in ZIP 57201's water?
EPA monitoring detected Nitrate, Copper, TTHM, Barium, Total Haloacetic Acids (HAA5), and others across this ZIP's suppliers. The full list with levels and sources is above.