What was found in ZIP 57028
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 |
|---|---|---|---|
| Nitrate | 6000 µg/L 60% of the EPA limit 10000 µg/L Main supplier: BIG SIOUX COMMUNITY WATER SYSTEM · 5,800 people · 2019 | 1/3 | SYR4 |
| Copper | 30.5 µg/L 2.3% of the EPA limit 1300 µg/L Main supplier: BIG SIOUX COMMUNITY WATER SYSTEM · 5,800 people · 2018
Highest in the ZIP: 2120 µg/L — PLEASANT VALLEY COLONY · 107 people · 2019 | 3/3 | SYR4 |
| Fluoride | 300 µg/L 7.5% of the EPA limit 4000 µg/L Highest in the ZIP: PLEASANT VALLEY COLONY · 107 people · 2012 | 1/3 | SYR4 |
| Barium | 21.745 µg/L 1.1% of the EPA limit 2000 µg/L Main supplier: BIG SIOUX COMMUNITY WATER SYSTEM · 5,800 people · 2017
Highest in the ZIP: 72 µg/L — PLEASANT VALLEY COLONY · 107 people · 2012 | 2/3 | SYR4 |
| TTHM | 45.775 µg/L 57% of the EPA limit 80 µg/L Main supplier: BIG SIOUX COMMUNITY WATER SYSTEM · 5,800 people · 2019 | 2/3 | SYR4 |
| Lithium | 36.1 µg/L No EPA limit set Main supplier: BIG SIOUX COMMUNITY WATER SYSTEM · 5,800 people · 2024 | 1/3 | UCMR-5 |
| Total Haloacetic Acids (HAA5) | 12.24 µg/L 20% of the EPA limit 60 µg/L Main supplier: BIG SIOUX COMMUNITY WATER SYSTEM · 5,800 people · 2019 | 2/3 | SYR4 |
| Gross Alpha, Excl. Radon And U | 1.6 pCi/L 11% of the EPA limit 15 pCi/L Main supplier: BIG SIOUX COMMUNITY WATER SYSTEM · 5,800 people · 2018
Highest in the ZIP: 5.21 pCi/L — PLEASANT VALLEY COLONY · 107 people · 2019 | 2/3 | SYR4 |
| Selenium | 3.359 µg/L 6.7% of the EPA limit 50 µg/L Main supplier: BIG SIOUX COMMUNITY WATER SYSTEM · 5,800 people · 2017 | 1/3 | SYR4 |
| Lead | 3.175 µg/L 21% of the EPA limit 15 µg/L Main supplier: BIG SIOUX COMMUNITY WATER SYSTEM · 5,800 people · 2018 | 3/3 | SYR4 |
| Chromium | 0.7380 µg/L 0.7% of the EPA limit 100 µg/L Main supplier: BIG SIOUX COMMUNITY WATER SYSTEM · 5,800 people · 2017 | 1/3 | SYR4 |
| Antimony, Total | 0.5000 µg/L 8.3% of the EPA limit 6 µg/L Main supplier: BIG SIOUX COMMUNITY WATER SYSTEM · 5,800 people · 2017 | 1/3 | SYR4 |
| Lead | 0.0010 mg/L 6.7% of the EPA limit 0.0150 mg/L Main supplier: BIG SIOUX COMMUNITY WATER SYSTEM · 5,800 people · 2024 | 3/3 | 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 57028
| Supplier | State | Population served |
|---|---|---|
| BIG SIOUX COMMUNITY WATER SYSTEM | SD | 5,800 |
| FLANDREAU | SD | 2,372 |
| PLEASANT VALLEY COLONY | SD | 107 |
Frequently asked questions about ZIP 57028 tap water
Is the tap water in ZIP 57028 safe to drink?
EPA testing detected 13 contaminants across the water suppliers serving ZIP 57028. 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 57028?
3 public water suppliers report EPA drinking-water monitoring for ZIP 57028. Each is listed above with its population served.
What contaminants are in ZIP 57028's water?
EPA monitoring detected Nitrate, Copper, Fluoride, Barium, TTHM, and others across this ZIP's suppliers. The full list with levels and sources is above.