We read 6 results from City of Roseville’s 2025 water quality report. No results over a legal limit; 1 above a health goal or guideline.
Serves about 155,612 people · Water system ID CA3110008 · 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 |
|---|---|---|---|---|
| Chromium-6average · range 1.2 to 4.8 · Groundwater wells, highest of 2 sources · 2025 report, page 6 | 3.56 ppb | 0.02 ppb | 10 ppb | Above the health goal178x the health goal |
| Chlorineaverage · range 0.14 to 1.68 · Distribution system · 2025 report, page 6 | 0.78 ppm | None set | 4 ppm | Below the legal limit |
| Copper90th percentile of 52 homes tested, 0 over the action level · printed as 64 ppb · sampled 2024 · Customer taps (52 sites) · 2025 report, page 7 | 0.06 ppm | 0.3 ppm | 1.3 ppm (action level) | Below the health goal |
| Fluorideaverage · range 0.5 to 0.89 · Distribution system · 2025 report, page 6 | 0.67 ppm | 1 ppm | 2 ppm | Below the health goal |
| Lead90th percentile of 52 homes tested, 0 over the action level · sampled 2024 · Customer taps (52 sites) · 2025 report, page 7 | Not detected | 0.2 ppb | 15 ppb (action level) | Not detected |
| Lithiumaverage · range ND to 62.6 · sampled 2024 · Entry points · 2025 report, page 7 | 7.3 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. 2 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 City of Roseville’s water between Aug 2023 and May 2024. These are EPA lab results, separate from the district’s report. Anything not listed was not detected.
- Lithium62.6 ppbFound in 2 of 17 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.
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