What was found in ZIP 58802
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 | 810 µg/L 20% of the EPA limit 4000 µg/L Main supplier: WILLISTON CITY OF · 26,426 people · 2016 | 1/2 | SYR4 |
| Nitrate-Nitrite | 300 µg/L 3% of the EPA limit 10000 µg/L Main supplier: WILLISTON CITY OF · 26,426 people · 2019 | 1/2 | SYR4 |
| Lithium | 79 µg/L No EPA limit set Main supplier: WILLISTON CITY OF · 26,426 people · 2023 | 2/2 | UCMR-5 |
| Copper | 49.92 µg/L 3.8% of the EPA limit 1300 µg/L Main supplier: WILLISTON CITY OF · 26,426 people · 2017
Highest in the ZIP: 76.48 µg/L — NORTHWEST RURAL WATER DISTRICT · 5,102 people · 2017 | 2/2 | SYR4 |
| TTHM | 36.2665 µg/L 45% of the EPA limit 80 µg/L Main supplier: WILLISTON CITY OF · 26,426 people · 2019 | 2/2 | SYR4 |
| Chloroform | 27.1275 µg/L No EPA limit set Main supplier: WILLISTON CITY OF · 26,426 people · 2019 | 2/2 | SYR4 |
| Total Haloacetic Acids (HAA5) | 17.274 µg/L 29% of the EPA limit 60 µg/L Main supplier: WILLISTON CITY OF · 26,426 people · 2019
Highest in the ZIP: 17.668 µg/L — NORTHWEST RURAL WATER DISTRICT · 5,102 people · 2019 | 2/2 | SYR4 |
| Dichloroacetic Acid | 14.32 µg/L No EPA limit set Main supplier: WILLISTON CITY OF · 26,426 people · 2019
Highest in the ZIP: 14.42 µg/L — NORTHWEST RURAL WATER DISTRICT · 5,102 people · 2019 | 2/2 | SYR4 |
| Barium | 14.3 µg/L 0.7% of the EPA limit 2000 µg/L Main supplier: WILLISTON CITY OF · 26,426 people · 2016 | 1/2 | SYR4 |
| Bromodichloromethane | 8.007 µg/L No EPA limit set Main supplier: WILLISTON CITY OF · 26,426 people · 2019 | 2/2 | SYR4 |
| Lead | 3.037 µg/L 20% of the EPA limit 15 µg/L Main supplier: WILLISTON CITY OF · 26,426 people · 2017
Highest in the ZIP: 4.6725 µg/L — NORTHWEST RURAL WATER DISTRICT · 5,102 people · 2017 | 2/2 | SYR4 |
| Monochloroacetic Acid | 2.444 µg/L No EPA limit set Main supplier: WILLISTON CITY OF · 26,426 people · 2019
Highest in the ZIP: 3.944 µg/L — NORTHWEST RURAL WATER DISTRICT · 5,102 people · 2019 | 2/2 | SYR4 |
| Gross Alpha, Excl. Radon And U | 3.9 pCi/L 26% of the EPA limit 15 pCi/L Main supplier: WILLISTON CITY OF · 26,426 people · 2017 | 1/2 | SYR4 |
| Trichloroacetic Acid | 3.853 µg/L No EPA limit set Main supplier: WILLISTON CITY OF · 26,426 people · 2019 | 2/2 | SYR4 |
| Dibromochloromethane | 2.4855 µg/L No EPA limit set Main supplier: WILLISTON CITY OF · 26,426 people · 2019 | 2/2 | SYR4 |
| Selenium | 1.44 µg/L 2.9% of the EPA limit 50 µg/L Main supplier: WILLISTON CITY OF · 26,426 people · 2016 | 1/2 | SYR4 |
| Chromium | 1.17 µg/L 1.2% of the EPA limit 100 µg/L Main supplier: WILLISTON CITY OF · 26,426 people · 2016 | 1/2 | SYR4 |
| Dibromoacetic Acid | 1.1325 µg/L No EPA limit set Main supplier: WILLISTON CITY OF · 26,426 people · 2019 | 2/2 | SYR4 |
| Combined Radium (-226 And -228) | 0.7800 pCi/L 16% of the EPA limit 5 pCi/L Main supplier: WILLISTON CITY OF · 26,426 people · 2017 | 1/2 | SYR4 |
| Pentachlorophenol | 0.0300 µg/L 3% of the EPA limit 1 µg/L Main supplier: WILLISTON CITY OF · 26,426 people · 2017 | 1/2 | SYR4 |
| Pfba | 0.0063 µg/L No EPA limit set Highest in the ZIP: NORTHWEST RURAL WATER DISTRICT · 5,102 people · 2023 | 1/2 | UCMR-5 |
| Lead | 0.0 mg/L 0% of the EPA limit 0.0150 mg/L Main supplier: WILLISTON CITY OF · 26,426 people · 2023 | 2/2 | LCR |
| Combined Uranium | -0.44 µg/L -1.5% of the EPA limit 30 µg/L Main supplier: WILLISTON CITY OF · 26,426 people · 2017 | 1/2 | SYR4 |
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 58802
| Supplier | State | Population served |
|---|---|---|
| WILLISTON CITY OF | ND | 26,426 |
| NORTHWEST RURAL WATER DISTRICT | ND | 5,102 |
Frequently asked questions about ZIP 58802 tap water
Is the tap water in ZIP 58802 safe to drink?
EPA testing detected 23 contaminants across the water suppliers serving ZIP 58802. 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 58802?
2 public water suppliers report EPA drinking-water monitoring for ZIP 58802. Each is listed above with its population served.
What contaminants are in ZIP 58802's water?
EPA monitoring detected Fluoride, Nitrate-Nitrite, Lithium, Copper, TTHM, and others across this ZIP's suppliers. The full list with levels and sources is above.