What was found in ZIP 57642
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 |
|---|---|---|---|
| Fluoride | 350 µg/L 8.8% of the EPA limit 4000 µg/L | 1/2 | SYR4 |
| Copper | 240 µg/L 18% of the EPA limit 1300 µg/L | 2/2 | SYR4 |
| Nitrate-Nitrite | 180 µg/L 1.8% of the EPA limit 10000 µg/L | 1/2 | SYR4 |
| TTHM | 113.5 µg/L 142% of the EPA limit, in the worst sample — 80 µg/L | 2/2 | SYR4 |
| Lithium | 60 µg/L No EPA limit set | 1/2 | UCMR-5 |
| Total Haloacetic Acids (HAA5) | 38.47 µg/L 64% of the EPA limit 60 µg/L | 2/2 | SYR4 |
| Cyanide | 15 µg/L 7.5% of the EPA limit 200 µg/L | 1/2 | SYR4 |
| Chloroform | 14.8 µg/L No EPA limit set | 1/2 | SYR4 |
| Barium | 12.2 µg/L 0.6% of the EPA limit 2000 µg/L | 1/2 | SYR4 |
| Lead | 11.6 µg/L 77% of the EPA limit 15 µg/L | 2/2 | SYR4 |
| Bromodichloromethane | 5.04 µg/L No EPA limit set | 1/2 | SYR4 |
| Combined Radium (-226 And -228) | 2.1 pCi/L 42% of the EPA limit 5 pCi/L | 1/2 | SYR4 |
| Dibromochloromethane | 1.27 µg/L No EPA limit set | 1/2 | SYR4 |
| Selenium | 1 µg/L 2% of the EPA limit 50 µg/L | 1/2 | SYR4 |
| Lead | 0.0063 mg/L 42% of the EPA limit 0.0150 mg/L | 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 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 57642
| Supplier | State | Population served |
|---|---|---|
| STANDING ROCK RURAL WATER SYSTEM | ND | 6,839 |
| MCLAUGHLIN | SD | 569 |
Frequently asked questions about ZIP 57642 tap water
Is the tap water in ZIP 57642 safe to drink?
EPA testing detected 15 contaminants across the water suppliers serving ZIP 57642. 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 57642?
2 public water suppliers report EPA drinking-water monitoring for ZIP 57642. Each is listed above with its population served.
What contaminants are in ZIP 57642's water?
EPA monitoring detected Fluoride, Copper, Nitrate-Nitrite, TTHM, Lithium, and others across this ZIP's suppliers. The full list with levels and sources is above.