What was found in ZIP 57764
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 | 2850 µg/L 28% of the EPA limit 10000 µg/L | 1/1 | SYR4 |
| Nitrate-Nitrite | 2400 µg/L 24% of the EPA limit 10000 µg/L | 1/1 | SYR4 |
| Fluoride | 1500 µg/L 38% of the EPA limit 4000 µg/L | 1/1 | SYR4 |
| Copper | 261 µg/L 20% of the EPA limit 1300 µg/L | 1/1 | SYR4 |
| Barium | 67 µg/L 3.4% of the EPA limit 2000 µg/L | 1/1 | SYR4 |
| Lithium | 59 µg/L No EPA limit set | 1/1 | UCMR-5 |
| Total Haloacetic Acids (HAA5) | 15 µg/L 25% of the EPA limit 60 µg/L | 1/1 | SYR4 |
| Selenium | 10 µg/L 20% of the EPA limit 50 µg/L | 1/1 | SYR4 |
| Arsenic | 8 µg/L 80% of the EPA limit 10 µg/L | 1/1 | SYR4 |
| TTHM | 6.65 µg/L 8.3% of the EPA limit 80 µg/L | 1/1 | SYR4 |
| Chromium | 1 µg/L 1% of the EPA limit 100 µg/L | 1/1 | SYR4 |
| Lead | 1 µg/L 6.7% of the EPA limit 15 µg/L | 1/1 | SYR4 |
| Combined Radium (-226 And -228) | 0.8390 pCi/L 17% of the EPA limit 5 pCi/L | 1/1 | SYR4 |
| Methoxychlor | 0.3100 µg/L 0.8% of the EPA limit 40 µg/L | 1/1 | SYR4 |
| Lead | 0.0 mg/L 0% of the EPA limit 0.0150 mg/L | 1/1 | 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 57764
| Supplier | State | Population served |
|---|---|---|
| OGLALA RWS PIPELINE | SD | 3,562 |
Frequently asked questions about ZIP 57764 tap water
Is the tap water in ZIP 57764 safe to drink?
EPA testing detected 15 contaminants across the water suppliers serving ZIP 57764. 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 57764?
1 public water supplier report EPA drinking-water monitoring for ZIP 57764. Each is listed above with its population served.
What contaminants are in ZIP 57764's water?
EPA monitoring detected Nitrate, Nitrate-Nitrite, Fluoride, Copper, Barium, and others across this ZIP's suppliers. The full list with levels and sources is above.