What was found in ZIP 57702
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 | 1443.5 µg/L 14% of the EPA limit 10000 µg/L Main supplier: RAPID CITY · 72,009 people · 2019
Highest in the ZIP: 10600 µg/L — SIPHON HILL WATER ASSOCIATION · 68 people · 2019 | 33/44 | SYR4 |
| Fluoride | 1600 µg/L 40% of the EPA limit 4000 µg/L Highest in the ZIP: RIMROCK HIGHLAND ESTATES COMM ASSOC · 66 people · 2017 | 33/44 | SYR4 |
| Copper | 311.7 µg/L 24% of the EPA limit 1300 µg/L Main supplier: RAPID CITY · 72,009 people · 2018
Highest in the ZIP: 541.55 µg/L — HIGHLAND HILLS · 38 people · 2017 | 43/44 | SYR4 |
| Barium | 134.5 µg/L 6.7% of the EPA limit 2000 µg/L Main supplier: RAPID CITY · 72,009 people · 2019
Highest in the ZIP: 533.7 µg/L — WESTBERRY TRAILS WATER USERS ASSOC · 155 people · 2018 | 34/44 | SYR4 |
| Nitrite | 200 µg/L 20% of the EPA limit 1000 µg/L Main supplier: RAPID CITY · 72,009 people · 2018 | 1/44 | SYR4 |
| TTHM | 28.85 µg/L 36% of the EPA limit 80 µg/L Main supplier: RAPID CITY · 72,009 people · 2019
Highest in the ZIP: 82.3 µg/L — SHERIDAN LAKE HIGHLANDS, INC. · 85 people · 2019 | 27/44 | SYR4 |
| Total Haloacetic Acids (HAA5) | 18.45 µg/L 31% of the EPA limit 60 µg/L Main supplier: RAPID CITY · 72,009 people · 2019
Highest in the ZIP: 67.06 µg/L — SHERIDAN LAKE HIGHLANDS, INC. · 85 people · 2019 | 11/44 | SYR4 |
| Selenium | 17 µg/L 34% of the EPA limit 50 µg/L Highest in the ZIP: RIMROCK HIGHLAND ESTATES COMM ASSOC · 66 people · 2017 | 1/44 | SYR4 |
| Gross Alpha, Excl. Radon And U | 6.594 pCi/L 44% of the EPA limit 15 pCi/L Main supplier: RAPID CITY · 72,009 people · 2018
Highest in the ZIP: 14.1 pCi/L — THE RANCH AT BLACK GAP · 375 people · 2019 | 27/44 | SYR4 |
| Lead | 4 µg/L 27% of the EPA limit 15 µg/L Main supplier: RAPID CITY · 72,009 people · 2018
Highest in the ZIP: 11.3 µg/L — RAPID CITY MOBILE HOME PARK · 170 people · 2018 | 43/44 | SYR4 |
| Combined Uranium | 11 µg/L 37% of the EPA limit 30 µg/L Highest in the ZIP: TIMBERWOOD PARK ESTATES · 283 people · 2019 | 2/44 | SYR4 |
| Arsenic | 6 µg/L 60% of the EPA limit 10 µg/L Main supplier: RAPID CITY · 72,009 people · 2019 | 6/44 | SYR4 |
| Gross Beta Particle Activity | 3.5 pCi/L No EPA limit set Main supplier: RAPID CITY · 72,009 people · 2018 | 1/44 | SYR4 |
| Chromium | 2.2 µg/L 2.2% of the EPA limit 100 µg/L Highest in the ZIP: PONDEROSA PARK · 50 people · 2012 | 3/44 | SYR4 |
| Mercury | 0.2000 µg/L 10% of the EPA limit 2 µg/L Highest in the ZIP: CARRIAGE HILLS · 267 people · 2012 | 1/44 | SYR4 |
| Lead | 0.0060 mg/L 40% of the EPA limit 0.0150 mg/L Main supplier: RAPID CITY · 72,009 people · 2024
Highest in the ZIP: 0.0140 mg/L — EDELWEISS MOUNTAIN IMPROVEMENT ASSOC · 70 people · 2024 | 44/44 | LCR |
| PFHXS | 0.0056 µg/L No EPA limit set Main supplier: RAPID CITY · 72,009 people · 2025 | 1/44 | UCMR-5 |
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 57702
Frequently asked questions about ZIP 57702 tap water
Is the tap water in ZIP 57702 safe to drink?
EPA testing detected 17 contaminants across the water suppliers serving ZIP 57702. 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 57702?
44 public water suppliers report EPA drinking-water monitoring for ZIP 57702. Each is listed above with its population served.
What contaminants are in ZIP 57702's water?
EPA monitoring detected Nitrate, Fluoride, Copper, Barium, Nitrite, and others across this ZIP's suppliers. The full list with levels and sources is above.