What was found in ZIP 57004
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 | 1450 µg/L 36% of the EPA limit 4000 µg/L Main supplier: SOUTH LINCOLN RURAL WATER SYSTEM · 5,250 people · 2019 | 1/4 | SYR4 |
| Copper | 1005 µg/L 77% of the EPA limit 1300 µg/L Main supplier: SOUTH LINCOLN RURAL WATER SYSTEM · 5,250 people · 2019 | 4/4 | SYR4 |
| Lithium | 105 µg/L No EPA limit set Main supplier: SOUTH LINCOLN RURAL WATER SYSTEM · 5,250 people · 2024 | 2/4 | UCMR-5 |
| TTHM | 0.7027 µg/L 0.9% of the EPA limit 80 µg/L Main supplier: SOUTH LINCOLN RURAL WATER SYSTEM · 5,250 people · 2019
Highest in the ZIP: 44.76 µg/L — CLAY RURAL WATER SYSTEM · 4,780 people · 2019 | 3/4 | SYR4 |
| Barium | 24.3 µg/L 1.2% of the EPA limit 2000 µg/L Main supplier: SOUTH LINCOLN RURAL WATER SYSTEM · 5,250 people · 2018 | 2/4 | SYR4 |
| Total Haloacetic Acids (HAA5) | 1.29 µg/L 2.2% of the EPA limit 60 µg/L Main supplier: SOUTH LINCOLN RURAL WATER SYSTEM · 5,250 people · 2019
Highest in the ZIP: 17.56 µg/L — BERESFORD · 2,359 people · 2019 | 3/4 | SYR4 |
| Gross Alpha, Excl. Radon And U | 7.4 pCi/L 49% of the EPA limit 15 pCi/L Main supplier: SOUTH LINCOLN RURAL WATER SYSTEM · 5,250 people · 2019 | 1/4 | SYR4 |
| Lead | 5.41 µg/L 36% of the EPA limit 15 µg/L Main supplier: SOUTH LINCOLN RURAL WATER SYSTEM · 5,250 people · 2019 | 4/4 | SYR4 |
| Arsenic | 2 µg/L 20% of the EPA limit 10 µg/L Highest in the ZIP: CLAY RURAL WATER SYSTEM · 4,780 people · 2012 | 1/4 | SYR4 |
| Chromium | 1.4 µg/L 1.4% of the EPA limit 100 µg/L Highest in the ZIP: CLAY RURAL WATER SYSTEM · 4,780 people · 2012 | 1/4 | SYR4 |
| Selenium | 0.9000 µg/L 1.8% of the EPA limit 50 µg/L Highest in the ZIP: CLAY RURAL WATER SYSTEM · 4,780 people · 2012 | 1/4 | SYR4 |
| Lead | 0.0010 mg/L 6.7% of the EPA limit 0.0150 mg/L Main supplier: SOUTH LINCOLN RURAL WATER SYSTEM · 5,250 people · 2025
Highest in the ZIP: 0.0040 mg/L — BERESFORD · 2,359 people · 2024 | 4/4 | 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 57004
| Supplier | State | Population served |
|---|---|---|
| SOUTH LINCOLN RURAL WATER SYSTEM | SD | 5,250 |
| CLAY RURAL WATER SYSTEM | SD | 4,780 |
| BERESFORD | SD | 2,359 |
| HUTTERVILLE COLONY SOUTH DAKOTA INC | SD | 90 |
Frequently asked questions about ZIP 57004 tap water
Is the tap water in ZIP 57004 safe to drink?
EPA testing detected 12 contaminants across the water suppliers serving ZIP 57004. 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 57004?
4 public water suppliers report EPA drinking-water monitoring for ZIP 57004. Each is listed above with its population served.
What contaminants are in ZIP 57004's water?
EPA monitoring detected Fluoride, Copper, Lithium, TTHM, Barium, and others across this ZIP's suppliers. The full list with levels and sources is above.