What was found in ZIP 57031
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 |
|---|---|---|---|
| TTHM | 44.76 µg/L 56% of the EPA limit 80 µg/L Main supplier: CLAY RURAL WATER SYSTEM · 4,780 people · 2019
Highest in the ZIP: 56.06 µg/L — MISSION HILL · 190 people · 2019 | 4/4 | SYR4 |
| Copper | 20.5 µg/L 1.6% of the EPA limit 1300 µg/L Main supplier: CLAY RURAL WATER SYSTEM · 4,780 people · 2018
Highest in the ZIP: 53 µg/L — UTICA · 65 people · 2018 | 4/4 | SYR4 |
| Lithium | 52.5 µg/L No EPA limit set Main supplier: CLAY RURAL WATER SYSTEM · 4,780 people · 2025 | 1/4 | UCMR-5 |
| Total Haloacetic Acids (HAA5) | 8.834 µg/L 15% of the EPA limit 60 µg/L Main supplier: CLAY RURAL WATER SYSTEM · 4,780 people · 2019
Highest in the ZIP: 33.68 µg/L — UTICA · 65 people · 2019 | 4/4 | SYR4 |
| Barium | 3.7 µg/L 0.2% of the EPA limit 2000 µg/L Main supplier: CLAY RURAL WATER SYSTEM · 4,780 people · 2012 | 1/4 | SYR4 |
| Arsenic | 2 µg/L 20% of the EPA limit 10 µg/L Main supplier: CLAY RURAL WATER SYSTEM · 4,780 people · 2012 | 1/4 | SYR4 |
| Lead | 0.8250 µg/L 5.5% of the EPA limit 15 µg/L Main supplier: CLAY RURAL WATER SYSTEM · 4,780 people · 2018
Highest in the ZIP: 1.865 µg/L — MISSION HILL · 190 people · 2017 | 4/4 | SYR4 |
| Chromium | 1.4 µg/L 1.4% of the EPA limit 100 µg/L Main supplier: CLAY RURAL WATER SYSTEM · 4,780 people · 2012 | 1/4 | SYR4 |
| Selenium | 0.9000 µg/L 1.8% of the EPA limit 50 µg/L Main supplier: CLAY RURAL WATER SYSTEM · 4,780 people · 2012 | 1/4 | SYR4 |
| Lead | 0.0010 mg/L 6.7% of the EPA limit 0.0150 mg/L Main supplier: CLAY RURAL WATER SYSTEM · 4,780 people · 2024
Highest in the ZIP: 0.0050 mg/L — UTICA · 65 people · 2024 | 4/4 | 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 57031
| Supplier | State | Population served |
|---|---|---|
| CLAY RURAL WATER SYSTEM | SD | 4,780 |
| GAYVILLE | SD | 392 |
| MISSION HILL | SD | 190 |
| UTICA | SD | 65 |
Frequently asked questions about ZIP 57031 tap water
Is the tap water in ZIP 57031 safe to drink?
EPA testing detected 10 contaminants across the water suppliers serving ZIP 57031. 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 57031?
4 public water suppliers report EPA drinking-water monitoring for ZIP 57031. Each is listed above with its population served.
What contaminants are in ZIP 57031's water?
EPA monitoring detected TTHM, Copper, Lithium, Total Haloacetic Acids (HAA5), Barium, and others across this ZIP's suppliers. The full list with levels and sources is above.