What was found in ZIP 57718
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 | 823 µg/L 8.2% of the EPA limit 10000 µg/L Main supplier: BLACK HAWK WATER USER DISTRICT · 4,500 people · 2018
Highest in the ZIP: 4150 µg/L — NORRIS PEAK WATER USERS ASSOC · 30 people · 2019 | 30/49 | SYR4 |
| Fluoride | 3900 µg/L 98% of the EPA limit 4000 µg/L Highest in the ZIP: OAK MOUNTAIN COUNTRY ESTATES · 85 people · 2017 | 34/49 | SYR4 |
| Copper | 317.65 µg/L 24% of the EPA limit 1300 µg/L Main supplier: BLACK HAWK WATER USER DISTRICT · 4,500 people · 2017
Highest in the ZIP: 620.1 µg/L — RUSHMORE RANCH ESTATES · 168 people · 2019 | 46/49 | SYR4 |
| Barium | 575 µg/L 29% of the EPA limit 2000 µg/L Highest in the ZIP: D & E WATER COMPANY · 100 people · 2012 | 32/49 | SYR4 |
| Gross Alpha, Excl. Radon And U | 48.875 pCi/L 326% of the EPA limit, at the 95th percentile of samples — 15 pCi/L Highest in the ZIP: VIEWFIELD RURAL WATER SYSTEM · 220 people · 2019 | 31/49 | SYR4 |
| TTHM | 3.32 µg/L 4.1% of the EPA limit 80 µg/L Main supplier: BLACK HAWK WATER USER DISTRICT · 4,500 people · 2019
Highest in the ZIP: 42.27 µg/L — RUSHMORE RANCH ESTATES · 168 people · 2019 | 29/49 | SYR4 |
| Combined Uranium | 23.5 µg/L 78% of the EPA limit 30 µg/L Highest in the ZIP: HEARTLAND COUNTRY RANCHETTES · 95 people · 2019 | 6/49 | SYR4 |
| Total Haloacetic Acids (HAA5) | 20.9 µg/L 35% of the EPA limit 60 µg/L Highest in the ZIP: CANYON SPRINGS WATER AND SEWER DISTR · 163 people · 2019 | 8/49 | SYR4 |
| Lead | 3.905 µg/L 26% of the EPA limit 15 µg/L Main supplier: BLACK HAWK WATER USER DISTRICT · 4,500 people · 2017
Highest in the ZIP: 13.1 µg/L — HEARTLAND COUNTRY RANCHETTES · 95 people · 2019 | 46/49 | SYR4 |
| Arsenic | 9 µg/L 90% of the EPA limit 10 µg/L Highest in the ZIP: RUSHMORE RANCH ESTATES · 168 people · 2019 | 9/49 | SYR4 |
| Selenium | 9 µg/L 18% of the EPA limit 50 µg/L Highest in the ZIP: COUNTRY ROAD ESTATES · 112 people · 2013 | 3/49 | SYR4 |
| Lead | 0.0020 mg/L 13% of the EPA limit 0.0150 mg/L Main supplier: BLACK HAWK WATER USER DISTRICT · 4,500 people · 2023
Highest in the ZIP: 0.0140 mg/L — EDELWEISS MOUNTAIN IMPROVEMENT ASSOC · 70 people · 2024 | 48/49 | 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 57718
Frequently asked questions about ZIP 57718 tap water
Is the tap water in ZIP 57718 safe to drink?
EPA testing detected 12 contaminants across the water suppliers serving ZIP 57718. 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 57718?
49 public water suppliers report EPA drinking-water monitoring for ZIP 57718. Each is listed above with its population served.
What contaminants are in ZIP 57718's water?
EPA monitoring detected Nitrate, Fluoride, Copper, Barium, Gross Alpha, Excl. Radon And U, and others across this ZIP's suppliers. The full list with levels and sources is above.