We read 19 results from City of Oakdale’s 2025 water quality report. No results over a legal limit; 3 above a health goal or guideline.
Serves about 23,235 people · Water system ID CA5010014 · 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 |
|---|---|---|---|---|
| Arsenicaverage · range ND to 3.5 · sampled 2024 · Wells · 2025 report, page 4 | 2.2 ppb | 0.004 ppb | 10 ppb | Above the health goal550x the health goal |
| Chromium-6average · range 0.97 to 3.37 · Wells · 2025 report, page 4 | 2.5 ppb | 0.02 ppb | 10 ppb | Above the health goal125x the health goal |
| Gross alpha (radioactivity)average · range ND to 3.16 · Wells · 2025 report, page 4 | 1.2 pCi/L | 0 pCi/L | 15 pCi/L | Above the health goalThe health goal is zero |
| Bariumaverage · range ND to 0.13 · sampled 2024 · Wells · 2025 report, page 4 | 0.04 ppm | 2 ppm | 2 ppm | Below the health goal |
| Chlorideaverage · range 3.2 to 16 · sampled 2024 · Wells · 2025 report, page 4 | 8.2 ppm | — | 250 ppm guideline | Within the guideline |
| Chlorineaverage · range 0.29 to 0.46 · Distribution system · 2025 report, page 4 | 0.38 ppm | None set | 4 ppm | Below the legal limit |
| Copper90th percentile of 32 homes tested, 0 over the action level · Customer taps · 2025 report, page 4 | Not detected | 0.3 ppm | 1.3 ppm (action level) | Not detected |
| Disinfection byproducts (TTHM)average · range ND to 2.05 · Distribution system · 2025 report, page 4 | 0.51 ppb | None set | 80 ppb | Below the legal limit |
| Lead90th percentile of 32 homes tested, 0 over the action level · Customer taps · 2025 report, page 4 | Not detected | 0.2 ppb | 15 ppb (action level) | Not detected |
| Nitrate (as N)average · range 0.84 to 3.9 · Wells · 2025 report, page 4 | 2.58 ppm | 10 ppm | 10 ppm | Below the health goal |
| PFHxS (a PFAS)average · range ND to 2.9 · Wells · 2025 report, page 5 | 0.2 ppt | None set | 10 ppt from 2029 | Below the legal limit |
| PFOS (a PFAS)average · range ND to 2.5 · Wells · 2025 report, page 5 | 0.3 ppt | 1 ppt | 4 ppt from 2029 | Below the health goal |
| Sulfateaverage · range 2.4 to 8.5 · sampled 2024 · Wells · 2025 report, page 4 | 5.4 ppm | — | 250 ppm guideline | Within the guideline |
| Total dissolved solidsaverage · range 130 to 220 · sampled 2024 · Wells · 2025 report, page 4 | 170 ppm | — | 500 ppm guideline | Within the guideline |
| Conductivityaverage · range 150 to 320 · sampled 2024 · Wells · 2025 report, page 4 | 234 µS/cm | None set | None | No health limit |
| Hardnessaverage · range 3.16 to 7.19 · sampled 2024 · Wells · 2025 report, page 5 | 5.21 gpg (89 ppm) | — | — | Moderately hard |
| PFHxA (a PFAS)average · range ND to 2 · Wells · 2025 report, page 5 | 0.1 ppt | None set | None | No health limit |
| Sodiumaverage · range 9.6 to 17 · sampled 2024 · Wells · 2025 report, page 5 | 12.4 ppm | None set | None | No health limit |
| Vanadiumaverage · range 6.1 to 12 · sampled 2024 · Wells · 2025 report, page 5 | 9.4 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.
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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