We read 12 results from Prior Lake’s 2025 water quality report. No results over a legal limit; 1 above a health goal or guideline.
Serves about 25,282 people · Water system ID MN1700007 · 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 |
|---|---|---|---|---|
| Gross alpha (radioactivity)as reported · Drinking water · 2025 report, page 3 | 3.8 pCi/L | 0 pCi/L | 15 pCi/L | Above the health goalThe health goal is zero |
| Bariumas reported · sampled 2024 · Drinking water · 2025 report, page 3 | 0.06 ppm | 2 ppm | 2 ppm | Below the health goal |
| Chlorineas reported · range 0.61 to 1 · Drinking water · 2025 report, page 4 | 0.69 ppm | None set | 4 ppm | Below the legal limit |
| Disinfection byproducts (HAA5)as reported · range 1.4 to 2.8 · Drinking water · 2025 report, page 4 | 2.8 ppb | None set | 60 ppb | Below the legal limit |
| Disinfection byproducts (TTHM)as reported · range 11.3 to 22.9 · Drinking water · 2025 report, page 4 | 22.9 ppb | None set | 80 ppb | Below the legal limit |
| Fluorideas reported · range 0.47 to 0.57 · Drinking water · 2025 report, page 4 | 0.59 ppm | 1 ppm | 4 ppm | Below the health goal |
| Lead90th percentile of homes tested, 0 over the action level · Customer taps · 2025 report, page 3 | Not detected | 0.2 ppb | 15 ppb (action level) | Not detected |
| Sulfateas reported · sampled 2024 · Drinking water · 2025 report, page 6 | 19.3 ppm | — | 250 ppm guideline | Within the guideline |
| Lithiumas reported · Drinking water · 2025 report, page 6 | 18.6 ppb | None set | None | No health limit |
| PFBA (a PFAS)as reported · range ND to 1.2 · Drinking water · 2025 report, page 6 | 0.6 ppt | None set | None | No health limit |
| PFHpA (a PFAS)as reported · range ND to 1.7 · Drinking water · 2025 report, page 6 | 0.9 ppt | None set | None | No health limit |
| Sodiumas reported · sampled 2024 · Drinking water · 2025 report, page 6 | 10.2 ppm | 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. 1 number we weren’t sure about is held back until a person checks.
EPA testing for PFAS and lithium
EPA’s own nationwide testing (UCMR 5) found these in Prior Lake’s water between Oct 2024 and Jul 2025. These are EPA lab results, separate from the district’s report. Anything not listed was not detected.
- Lithium18.6 ppbFound in 2 of 2 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.
Radium and uranium
Found: Gross alpha (radioactivity)
What removes it: Reverse osmosis.
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