We read 13 results from Pierre’s 2025 water quality report. No results over a legal limit; 3 above a health goal or guideline.
Serves about 14,091 people · Water system ID SD4600242 · Read the district’s 2025 report (opens in a new tab)
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Results from the 2025 report
Each number is copied from the district’s report and links to the page it’s printed on. Where the report lists several plants, wells or purchased water, the highest is shown.
| Contaminant | Result | Health goal | Legal limit | What it means |
|---|---|---|---|---|
| Arsenichighest measured · range 2 to 2 · 2025 report, page 3 | 2 ppb | 0.004 ppb | 10 ppb | Above the health goal500x the health goal |
| Atrazinehighest measured · range ND to 0.23 · sampled 2023 · 2025 report, page 3 | 0.23 ppb | 0.15 ppb | 3 ppb | Above the health goal1.5x the health goal |
| Copper90th percentile of homes tested, 0 over the action level · sampled 2023 · Customer taps · 2025 report, page 3 | 0.4 ppm | 0.3 ppm | 1.3 ppm (action level) | Above the health goal1.3x the health goal |
| Antimonyhighest measured · range 0.3 to 0.3 · 2025 report, page 3 | 0.3 ppb | 1 ppb | 6 ppb | Below the health goal |
| Bariumhighest measured · range 0.03 to 0.03 · 2025 report, page 3 | 0.03 ppm | 2 ppm | 2 ppm | Below the health goal |
| Chromium (total)highest measured · range 0.41 to 0.41 · 2025 report, page 3 | 0.41 ppb | None set | 100 ppb | Below the legal limit |
| Disinfection byproducts (HAA5)highest running annual average · range 17.3 to 20.1 · 2025 report, page 3 | 20.1 ppb | None set | 60 ppb | Below the legal limit |
| Disinfection byproducts (TTHM)highest running annual average · range 29.4 to 32.2 · 2025 report, page 3 | 32.2 ppb | None set | 80 ppb | Below the legal limit |
| Fluoridehighest measured · 2025 report, page 3 | 0.48 ppm | 1 ppm | 4 ppm | Below the health goal |
| Lead90th percentile of homes tested, 0 over the action level · sampled 2023 · Customer taps · 2025 report, page 3 | Not detected | 0.2 ppb | 15 ppb (action level) | Not detected |
| Seleniumhighest measured · range 1.5 to 1.5 · 2025 report, page 3 | 1.5 ppb | 30 ppb | 50 ppb | Below the health goal |
| Turbidity (cloudiness)highest measured · Treatment plant · 2025 report, page 4 | 0.08 NTU | None set | 1 NTU | Below the legal limit |
| Lithiumhighest measured · range 21.9 to 21.9 · sampled 2024 · 2025 report, page 5 | 21.9 ppb | None set | None | No health limit |
Utility results describe the whole system, measured where water enters the pipes, not your tap. Your home’s plumbing can add lead or copper.
EPA testing for PFAS and lithium
EPA’s own nationwide testing (UCMR 5) found these in Pierre’s water between Jul 2024 and Apr 2025. These are EPA lab results, separate from the district’s report. Anything not listed was not detected.
- Lithium25.2 ppbFound in 4 of 4 samples · highest resultAbove EPA’s health reference level of 10 ppb (a guide, not a legal limit)
Source: EPA UCMR 5 occurrence data. The highest single result is shown; one high sample doesn’t mean every glass is that high.
What you can do
Nothing here is an emergency notice: if the district has a violation, it must tell customers directly. If you’d like to lower these at your tap, these are the treatments that remove them, and the catalog shows the models certified for each. Ranking is by certified removal; commissions never change the order.
Industrial chemicals and pesticides
Found: Atrazine
What removes it: Carbon block or RO.
Copper
Found: Copper
What removes it: Reverse osmosis.
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