What was found in ZIP 57501
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 | 1100 µg/L 11% of the EPA limit 10000 µg/L Main supplier: PIERRE · 14,091 people · 2019 | 2/4 | SYR4 |
| Copper | 1032 µg/L 79% of the EPA limit 1300 µg/L Main supplier: PIERRE · 14,091 people · 2017 | 4/4 | SYR4 |
| Fluoride | 450 µg/L 11% of the EPA limit 4000 µg/L Highest in the ZIP: MID-DAKOTA RURAL WATER · 11,833 people · 2019 | 1/4 | SYR4 |
| TTHM | 5.959999999999999 µg/L 7.4% of the EPA limit 80 µg/L Main supplier: PIERRE · 14,091 people · 2019
Highest in the ZIP: 78.695 µg/L — TMT, INC. · 250 people · 2019 | 4/4 | SYR4 |
| Lithium | 25.2 µg/L No EPA limit set Main supplier: PIERRE · 14,091 people · 2025
Highest in the ZIP: 74.1 µg/L — TMT, INC. · 250 people · 2023 | 3/4 | UCMR-5 |
| Total Haloacetic Acids (HAA5) | 6.3759999999999994 µg/L 11% of the EPA limit 60 µg/L Main supplier: PIERRE · 14,091 people · 2019
Highest in the ZIP: 48.59999999999999 µg/L — MID-DAKOTA RURAL WATER · 11,833 people · 2019 | 4/4 | SYR4 |
| Barium | 42.4 µg/L 2.1% of the EPA limit 2000 µg/L Highest in the ZIP: MID-DAKOTA RURAL WATER · 11,833 people · 2013 | 1/4 | SYR4 |
| Lead | 6 µg/L 40% of the EPA limit 15 µg/L Main supplier: PIERRE · 14,091 people · 2017 | 4/4 | SYR4 |
| Gross Alpha, Excl. Radon And U | 3.7 pCi/L 25% of the EPA limit 15 pCi/L Main supplier: PIERRE · 14,091 people · 2014
Highest in the ZIP: 3.8 pCi/L — MID-DAKOTA RURAL WATER · 11,833 people · 2016 | 2/4 | SYR4 |
| Arsenic | 3 µg/L 30% of the EPA limit 10 µg/L Highest in the ZIP: MID-DAKOTA RURAL WATER · 11,833 people · 2013 | 1/4 | SYR4 |
| Chromium | 1.6 µg/L 1.6% of the EPA limit 100 µg/L Highest in the ZIP: MID-DAKOTA RURAL WATER · 11,833 people · 2013 | 1/4 | SYR4 |
| Selenium | 1.4 µg/L 2.8% of the EPA limit 50 µg/L Highest in the ZIP: MID-DAKOTA RURAL WATER · 11,833 people · 2013 | 1/4 | SYR4 |
| Antimony, Total | 0.4000 µg/L 6.7% of the EPA limit 6 µg/L Highest in the ZIP: MID-DAKOTA RURAL WATER · 11,833 people · 2013 | 1/4 | SYR4 |
| Lead | 0.0010 mg/L 6.7% of the EPA limit 0.0150 mg/L Main supplier: PIERRE · 14,091 people · 2023
Highest in the ZIP: 0.0020 mg/L — MID-DAKOTA RURAL WATER · 11,833 people · 2025 | 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 57501
| Supplier | State | Population served |
|---|---|---|
| PIERRE | SD | 14,091 |
| MID-DAKOTA RURAL WATER | SD | 11,833 |
| SPRING CREEK SANITARY DISTRICT | SD | 465 |
| TMT, INC. | SD | 250 |
Frequently asked questions about ZIP 57501 tap water
Is the tap water in ZIP 57501 safe to drink?
EPA testing detected 14 contaminants across the water suppliers serving ZIP 57501. 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 57501?
4 public water suppliers report EPA drinking-water monitoring for ZIP 57501. Each is listed above with its population served.
What contaminants are in ZIP 57501's water?
EPA monitoring detected Nitrate, Copper, Fluoride, TTHM, Lithium, and others across this ZIP's suppliers. The full list with levels and sources is above.