We read 12 results from South Lincoln Rural Water System’s 2025 water quality report. No results over a legal limit; 6 above a health goal or guideline.
Serves about 4,404 people · Water system ID SD4600870 · 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 1 to 1 · Lewis and Clark Regional Water System · 2025 report, page 3 | 1 ppb | 0.004 ppb | 10 ppb | Above the health goal250x the health goal |
| Copper90th percentile of homes tested, 0 over the action level · Customer taps · 2025 report, page 3 | 0.7 ppm | 0.3 ppm | 1.3 ppm (action level) | Above the health goal2.3x the health goal |
| Fluoridehighest measured · highest of 2 sources · 2025 report, page 3 | 1.63 ppm | 1 ppm | 4 ppm | Above the health goal1.6x the health goal |
| Gross alpha (radioactivity)highest measured · range ND to 7 · sampled 2022 · 2025 report, page 3 | 7 pCi/L | 0 pCi/L | 15 pCi/L | Above the health goalThe health goal is zero |
| Lead90th percentile of homes tested, 0 over the action level · Customer taps · 2025 report, page 3 | 1 ppb | 0.2 ppb | 15 ppb (action level) | Above the health goal5x the health goal |
| Radium (combined 226 + 228)highest measured · range ND to 2 · sampled 2022 · 2025 report, page 3 | 2 pCi/L | 0 pCi/L | 5 pCi/L | Above the health goalThe health goal is zero |
| Bariumhighest measured · range 0.02 to 0.02 · sampled 2022 · highest of 2 sources · 2025 report, page 3 | 0.02 ppm | 2 ppm | 2 ppm | Below the health goal |
| Chromium (total)highest measured · range 1.5 to 1.5 · sampled 2022 · highest of 2 sources · 2025 report, page 3 | 1.5 ppb | None set | 100 ppb | Below the legal limit |
| Mercuryhighest measured · range 0.11 to 0.11 · Lewis and Clark Regional Water System · 2025 report, page 4 | 0.11 ppb | 1.2 ppb | 2 ppb | Below the health goal |
| Nitrate (as N)highest measured · Lewis and Clark Regional Water System · 2025 report, page 4 | 0.3 ppm | 10 ppm | 10 ppm | Below the health goal |
| Seleniumhighest measured · range 1 to 1 · Lewis and Clark Regional Water System · 2025 report, page 4 | 1 ppb | 30 ppb | 50 ppb | Below the health goal |
| Lithiumhighest measured · range 61.1 to 105 · sampled 2024 · 2025 report, page 5 | 105 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 South Lincoln Rural Water System’s water between Jan 2024 and Jul 2024. These are EPA lab results, separate from the district’s report. Anything not listed was not detected.
- Lithium105 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.
Lead
Found: Copper, Lead
What removes it: Reverse osmosis or Certified carbon block or RO.
Fluoride
Found: Fluoride
What removes it: Reverse osmosis.
Radium and uranium
Found: Gross alpha (radioactivity), Radium (combined 226 + 228)
What removes it: Reverse osmosis.
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