What was found in ZIP 57078
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 | 740 µg/L 19% of the EPA limit 4000 µg/L | 1/5 | SYR4 |
| Copper | 350 µg/L 27% of the EPA limit 1300 µg/L | 5/5 | SYR4 |
| Nitrate | 300 µg/L 3% of the EPA limit 10000 µg/L | 1/5 | SYR4 |
| TTHM | 154 µg/L 193% of the EPA limit, in the worst sample — 80 µg/L | 5/5 | SYR4 |
| Total Haloacetic Acids (HAA5) | 81 µg/L 135% of the EPA limit, in the worst sample — 60 µg/L | 5/5 | SYR4 |
| Lithium | 69 µg/L No EPA limit set | 3/5 | UCMR-5 |
| Barium | 13.5 µg/L 0.7% of the EPA limit 2000 µg/L | 3/5 | SYR4 |
| Lead | 10.4 µg/L 69% of the EPA limit 15 µg/L | 5/5 | SYR4 |
| Arsenic | 3 µg/L 30% of the EPA limit 10 µg/L | 2/5 | SYR4 |
| Selenium | 1.9 µg/L 3.8% of the EPA limit 50 µg/L | 3/5 | SYR4 |
| Chromium | 1.7 µg/L 1.7% of the EPA limit 100 µg/L | 3/5 | SYR4 |
| Gross Alpha, Excl. Radon And U | 0.7000 pCi/L 4.7% of the EPA limit 15 pCi/L | 1/5 | SYR4 |
| Antimony, Total | 0.3000 µg/L 5% of the EPA limit 6 µg/L | 2/5 | SYR4 |
| Lead | 0.0010 mg/L 6.7% of the EPA limit 0.0150 mg/L | 5/5 | 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 57078
| Supplier | State | Population served |
|---|---|---|
| YANKTON | SD | 15,411 |
| BY WATER DISTRICT | SD | 13,320 |
| CLAY RURAL WATER SYSTEM | SD | 4,780 |
| EAST WINDS COURT, INC. | SD | 180 |
| TIMBERLAND PARK | SD | 95 |
Frequently asked questions about ZIP 57078 tap water
Is the tap water in ZIP 57078 safe to drink?
EPA testing detected 14 contaminants across the water suppliers serving ZIP 57078. 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 57078?
5 public water suppliers report EPA drinking-water monitoring for ZIP 57078. Each is listed above with its population served.
What contaminants are in ZIP 57078's water?
EPA monitoring detected Fluoride, Copper, Nitrate, TTHM, Total Haloacetic Acids (HAA5), and others across this ZIP's suppliers. The full list with levels and sources is above.