What was found in ZIP 57703
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 | 593 µg/L 5.9% of the EPA limit 10000 µg/L Main supplier: BOX ELDER · 14,000 people · 2019
Highest in the ZIP: 892 µg/L — RAPID VALLEY SANITARY DISTRICT · 11,408 people · 2019 | 2/4 | SYR4 |
| Fluoride | 400 µg/L 10% of the EPA limit 4000 µg/L Main supplier: BOX ELDER · 14,000 people · 2017 | 2/4 | SYR4 |
| Copper | 293.15 µg/L 23% of the EPA limit 1300 µg/L Main supplier: BOX ELDER · 14,000 people · 2017
Highest in the ZIP: 339.6 µg/L — RAPID VALLEY SANITARY DISTRICT · 11,408 people · 2018 | 3/4 | SYR4 |
| Barium | 99.9 µg/L 5% of the EPA limit 2000 µg/L Main supplier: BOX ELDER · 14,000 people · 2017 | 2/4 | SYR4 |
| TTHM | 7.379 µg/L 9.2% of the EPA limit 80 µg/L Main supplier: BOX ELDER · 14,000 people · 2019
Highest in the ZIP: 73.75 µg/L — RAPID VALLEY SANITARY DISTRICT · 11,408 people · 2019 | 2/4 | SYR4 |
| Total Haloacetic Acids (HAA5) | 52.28 µg/L 87% of the EPA limit 60 µg/L Highest in the ZIP: RAPID VALLEY SANITARY DISTRICT · 11,408 people · 2019 | 1/4 | SYR4 |
| Lithium | 14 µg/L No EPA limit set Main supplier: BOX ELDER · 14,000 people · 2023
Highest in the ZIP: 23.4 µg/L — RAPID VALLEY SANITARY DISTRICT · 11,408 people · 2024 | 2/4 | UCMR-5 |
| Selenium | 18.25 µg/L 37% of the EPA limit 50 µg/L Main supplier: BOX ELDER · 14,000 people · 2017 | 1/4 | SYR4 |
| Gross Alpha, Excl. Radon And U | 15.36 pCi/L 102% of the EPA limit, at the 95th percentile of samples — 15 pCi/L Main supplier: BOX ELDER · 14,000 people · 2017 | 3/4 | SYR4 |
| Combined Uranium | 8.8735 µg/L 30% of the EPA limit 30 µg/L Main supplier: BOX ELDER · 14,000 people · 2017 | 1/4 | SYR4 |
| Lead | 4 µg/L 27% of the EPA limit 15 µg/L Main supplier: BOX ELDER · 14,000 people · 2017
Highest in the ZIP: 6.05 µg/L — RAPID VALLEY SANITARY DISTRICT · 11,408 people · 2018 | 3/4 | SYR4 |
| Chromium | 4.4 µg/L 4.4% of the EPA limit 100 µg/L Main supplier: BOX ELDER · 14,000 people · 2017 | 1/4 | SYR4 |
| PFHXS | 0.0058 µg/L No EPA limit set Highest in the ZIP: RAPID VALLEY SANITARY DISTRICT · 11,408 people · 2024 | 1/4 | UCMR-5 |
| PFOS | 0.0057 µg/L No EPA limit set Highest in the ZIP: RAPID VALLEY SANITARY DISTRICT · 11,408 people · 2024 | 1/4 | UCMR-5 |
| Lead | 0.0020 mg/L 13% of the EPA limit 0.0150 mg/L Main supplier: BOX ELDER · 14,000 people · 2023
Highest in the ZIP: 0.0030 mg/L — RAPID VALLEY SANITARY DISTRICT · 11,408 people · 2024 | 3/4 | 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 57703
| Supplier | State | Population served |
|---|---|---|
| BOX ELDER | SD | 14,000 |
| RAPID VALLEY SANITARY DISTRICT | SD | 11,408 |
| CEDAR GULCH 1 | SD | 45 |
| DARLINGTON ESTATES | SD | 25 |
Frequently asked questions about ZIP 57703 tap water
Is the tap water in ZIP 57703 safe to drink?
EPA testing detected 15 contaminants across the water suppliers serving ZIP 57703. 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 57703?
4 public water suppliers report EPA drinking-water monitoring for ZIP 57703. Each is listed above with its population served.
What contaminants are in ZIP 57703's water?
EPA monitoring detected Nitrate, Fluoride, Copper, Barium, TTHM, and others across this ZIP's suppliers. The full list with levels and sources is above.