What was found in ZIP 56257
The level at this ZIP's main supplier, the highest level anywhere in it, the EPA limit for each, and where the figure comes from.
| Contaminant | Level vs EPA limit | Suppliers | Source |
|---|---|---|---|
| Copper | 970 µg/L 75% of the EPA limit 1300 µg/L Main supplier: GRANT-ROBERTS RURAL WATER SYSTEM · 5,050 people · 2019 | 1/1 | SYR4 |
| Barium | 65.5 µg/L 3.3% of the EPA limit 2000 µg/L Main supplier: GRANT-ROBERTS RURAL WATER SYSTEM · 5,050 people · 2013 | 1/1 | SYR4 |
| Nitrite | 60 µg/L 6% of the EPA limit 1000 µg/L Main supplier: GRANT-ROBERTS RURAL WATER SYSTEM · 5,050 people · 2017 | 1/1 | SYR4 |
| Lithium | 55.7 µg/L No EPA limit set Main supplier: GRANT-ROBERTS RURAL WATER SYSTEM · 5,050 people · 2023 | 1/1 | UCMR-5 |
| TTHM | 21.6895 µg/L 27% of the EPA limit 80 µg/L Main supplier: GRANT-ROBERTS RURAL WATER SYSTEM · 5,050 people · 2019 | 1/1 | SYR4 |
| Total Haloacetic Acids (HAA5) | 11.382 µg/L 19% of the EPA limit 60 µg/L Main supplier: GRANT-ROBERTS RURAL WATER SYSTEM · 5,050 people · 2019 | 1/1 | SYR4 |
| Lead | 8.785 µg/L 59% of the EPA limit 15 µg/L Main supplier: GRANT-ROBERTS RURAL WATER SYSTEM · 5,050 people · 2019 | 1/1 | SYR4 |
| Chromium | 8.2 µg/L 8.2% of the EPA limit 100 µg/L Main supplier: GRANT-ROBERTS RURAL WATER SYSTEM · 5,050 people · 2013 | 1/1 | SYR4 |
| Arsenic | 4 µg/L 40% of the EPA limit 10 µg/L Main supplier: GRANT-ROBERTS RURAL WATER SYSTEM · 5,050 people · 2013 | 1/1 | SYR4 |
| Selenium | 0.9000 µg/L 1.8% of the EPA limit 50 µg/L Main supplier: GRANT-ROBERTS RURAL WATER SYSTEM · 5,050 people · 2013 | 1/1 | SYR4 |
| Lead | 0.0030 mg/L 20% of the EPA limit 0.0150 mg/L Main supplier: GRANT-ROBERTS RURAL WATER SYSTEM · 5,050 people · 2025 | 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 95th percentile of the
system's samples — over 100% is worth reading, but is not by itself a
violation.
Formal violations are listed separately.
Water suppliers serving ZIP 56257
| Supplier | State | Population served |
|---|---|---|
| GRANT-ROBERTS RURAL WATER SYSTEM | SD | 5,050 |
Frequently asked questions about ZIP 56257 tap water
Is the tap water in ZIP 56257 safe to drink?
EPA testing detected 11 contaminants across the water suppliers serving ZIP 56257. 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 56257?
1 public water supplier report EPA drinking-water monitoring for ZIP 56257. Each is listed above with its population served.
What contaminants are in ZIP 56257's water?
EPA monitoring detected Copper, Barium, Nitrite, Lithium, TTHM, and others across this ZIP's suppliers. The full list with levels and sources is above.