What was found in ZIP 58538
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 |
|---|---|---|---|
| Fluoride | 350 µg/L 8.8% of the EPA limit 4000 µg/L Main supplier: STANDING ROCK RURAL WATER SYSTEM · 6,839 people · 2013 | 1/1 | SYR4 |
| Nitrate-Nitrite | 180 µg/L 1.8% of the EPA limit 10000 µg/L Main supplier: STANDING ROCK RURAL WATER SYSTEM · 6,839 people · 2019 | 1/1 | SYR4 |
| Copper | 76.685 µg/L 5.9% of the EPA limit 1300 µg/L Main supplier: STANDING ROCK RURAL WATER SYSTEM · 6,839 people · 2019 | 1/1 | SYR4 |
| TTHM | 60.179 µg/L 75% of the EPA limit 80 µg/L Main supplier: STANDING ROCK RURAL WATER SYSTEM · 6,839 people · 2019 | 1/1 | SYR4 |
| Lithium | 60 µg/L No EPA limit set Main supplier: STANDING ROCK RURAL WATER SYSTEM · 6,839 people · 2024 | 1/1 | UCMR-5 |
| Total Haloacetic Acids (HAA5) | 28.7775 µg/L 48% of the EPA limit 60 µg/L Main supplier: STANDING ROCK RURAL WATER SYSTEM · 6,839 people · 2019 | 1/1 | SYR4 |
| Cyanide | 14.8 µg/L 7.4% of the EPA limit 200 µg/L Main supplier: STANDING ROCK RURAL WATER SYSTEM · 6,839 people · 2019 | 1/1 | SYR4 |
| Chloroform | 14.8 µg/L No EPA limit set Main supplier: STANDING ROCK RURAL WATER SYSTEM · 6,839 people · 2017 | 1/1 | SYR4 |
| Barium | 12.2 µg/L 0.6% of the EPA limit 2000 µg/L Main supplier: STANDING ROCK RURAL WATER SYSTEM · 6,839 people · 2013 | 1/1 | SYR4 |
| Bromodichloromethane | 5.04 µg/L No EPA limit set Main supplier: STANDING ROCK RURAL WATER SYSTEM · 6,839 people · 2017 | 1/1 | SYR4 |
| Lead | 2.1225 µg/L 14% of the EPA limit 15 µg/L Main supplier: STANDING ROCK RURAL WATER SYSTEM · 6,839 people · 2019 | 1/1 | SYR4 |
| Combined Radium (-226 And -228) | 2.0249 pCi/L 40% of the EPA limit 5 pCi/L Main supplier: STANDING ROCK RURAL WATER SYSTEM · 6,839 people · 2019 | 1/1 | SYR4 |
| Dibromochloromethane | 1.27 µg/L No EPA limit set Main supplier: STANDING ROCK RURAL WATER SYSTEM · 6,839 people · 2017 | 1/1 | SYR4 |
| Selenium | 1 µg/L 2% of the EPA limit 50 µg/L Main supplier: STANDING ROCK RURAL WATER SYSTEM · 6,839 people · 2013 | 1/1 | SYR4 |
| Lead | 0.0063 mg/L 42% of the EPA limit 0.0150 mg/L Main supplier: STANDING ROCK RURAL WATER SYSTEM · 6,839 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 58538
| Supplier | State | Population served |
|---|---|---|
| STANDING ROCK RURAL WATER SYSTEM | ND | 6,839 |
Frequently asked questions about ZIP 58538 tap water
Is the tap water in ZIP 58538 safe to drink?
EPA testing detected 15 contaminants across the water suppliers serving ZIP 58538. 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 58538?
1 public water supplier report EPA drinking-water monitoring for ZIP 58538. Each is listed above with its population served.
What contaminants are in ZIP 58538's water?
EPA monitoring detected Fluoride, Nitrate-Nitrite, Copper, TTHM, Lithium, and others across this ZIP's suppliers. The full list with levels and sources is above.