We read 3 results from Rapid City’s 2025 water quality report. No results over a legal limit; 1 above a health goal or guideline.
Serves about 72,009 people · Water system ID SD4600406 · 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 |
|---|---|---|---|---|
| Lead90th percentile of homes tested, 0 over the action level · sampled 2024 · Customer taps · 2025 report, page 4 | 6 ppb | 0.2 ppb | 15 ppb (action level) | Above the health goal30x the health goal |
| Copper90th percentile of homes tested, 1 over the action level · sampled 2024 · Customer taps · 2025 report, page 4 | 0.2 ppm | 0.3 ppm | 1.3 ppm (action level) | Below the health goal |
| PFHxS (a PFAS)highest measured · printed as 0.0056 ug/l · 2025 report, page 5 | 5.6 ppt | None set | 10 ppt from 2029 | Below the legal 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. 7 numbers we weren’t sure about are held back until a person checks.
EPA testing for PFAS and lithium
EPA’s own nationwide testing (UCMR 5) found these in Rapid City’s water between Aug 2024 and Sep 2025. These are EPA lab results, separate from the district’s report. Anything not listed was not detected.
- PFHxS5.6 pptFound in 2 of 20 samples · highest resultNo federal limit in force for this one
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: Lead
What removes it: Certified carbon block or RO.
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