We read 5 results from San Joaquin County-Mokelumne Acres’s 2023 water quality report. No results over a legal limit or above a health goal.
Serves about 3,802 people · Water system ID CA3910017 · Read the district’s 2023 report (opens in a new tab)
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Results from the 2023 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 |
|---|---|---|---|---|
| Alkalinityas reported · range 70 to 270 · 2023 report, page 6 | 170 ppm | None set | None | No health limit |
| Calciumas reported · range 13 to 64 · 2023 report, page 6 | 38.5 ppm | None set | None | No health limit |
| Magnesiumas reported · range 8 to 31 · 2023 report, page 6 | 19.5 ppm | None set | None | No health limit |
| Potassiumas reported · range 2 to 3 · 2023 report, page 6 | 2.5 ppm | None set | None | No health limit |
| Sodiumas reported · range 6 to 35 · 2023 report, page 6 | 15.7 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.
EPA testing for PFAS and lithium
EPA’s own nationwide testing (UCMR 5) found these in San Joaquin County-Mokelumne Acres’s water between Jan 2025 and Jul 2025. These are EPA lab results, separate from the district’s report. Anything not listed was not detected.
- PFOA8.3 pptFound in 3 of 10 samples · highest resultAbove the federal limit that takes effect in 2029 (4 ppt)
- PFOS13.5 pptFound in 2 of 10 samples · highest resultAbove the federal limit that takes effect in 2029 (4 ppt)
- PFHxS4.7 pptFound in 6 of 10 samples · highest resultNo federal limit in force for this one
- PFBS8.5 pptFound in 2 of 10 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.
PFAS ("forever chemicals")
Found: PFOA (EPA testing), PFOS (EPA testing)
What removes it: Reverse osmosis.
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