We read 26 results from City of Riverbank’s 2025 water quality report. No results over a legal limit; 6 above a health goal or guideline.
Serves about 24,834 people · Water system ID CA5010018 · 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 2 to 3 · Wells · 2025 report, page 3 | 3 ppb | 0.004 ppb | 10 ppb | Above the health goal750x the health goal |
| Chromium-6average · range 2.1 to 4.8 · Wells · 2025 report, page 3 | 3.7 ppb | 0.02 ppb | 10 ppb | Above the health goal185x the health goal |
| Gross alpha (radioactivity)average · range ND to 5.64 · Wells · 2025 report, page 3 | 2.79 pCi/L | 0 pCi/L | 15 pCi/L | Above the health goalThe health goal is zero |
| Lead90th percentile of 30 homes tested, 0 over the action level · sampled 2023 · Customer taps · 2025 report, page 2 | 3 ppb | 0.2 ppb | 15 ppb (action level) | Above the health goal15x the health goal |
| PFOA (a PFAS)average · range ND to 2.3 · Wells · 2025 report, page 3 | 0.1 ppt | 0.007 ppt | 4 ppt from 2029 | Above the health goal14x the health goal |
| Uraniumaverage · range 5.66 to 7.06 · printed as 4.3 pCi/L · Wells · 2025 report, page 3 | 6.41 ppb | 0.6 ppb | 30 ppb | Above the health goal11x the health goal |
| Chlorideaverage · range 5 to 22 · Wells · 2025 report, page 3 | 12 ppm | — | 250 ppm guideline | Within the guideline |
| Chlorineaverage · range 0.14 to 0.95 · Distribution system · 2025 report, page 3 | 0.55 ppm | None set | 4 ppm | Below the legal limit |
| Copper90th percentile of 30 homes tested, 0 over the action level · sampled 2023 · Customer taps · 2025 report, page 2 | 0.15 ppm | 0.3 ppm | 1.3 ppm (action level) | Below the health goal |
| Ironaverage · range ND to 0.07 · printed as 12 ug/L · Wells · 2025 report, page 3 | 0.01 ppm | — | 0.3 ppm guideline | Within the guideline |
| Manganeseaverage · range ND to 0.0041 · printed as 0.9 ug/L · Wells · 2025 report, page 3 | 0.0009 ppm | — | 0.05 ppm guideline | Within the guideline |
| Nitrate (as N)average · range 1.5 to 6.4 · Wells · 2025 report, page 3 | 4.1 ppm | 10 ppm | 10 ppm | Below the health goal |
| PFHxS (a PFAS)average · range ND to 2.6 · Wells · 2025 report, page 3 | 0.1 ppt | None set | 10 ppt from 2029 | Below the legal limit |
| PFOS (a PFAS)average · range ND to 3.4 · Wells · 2025 report, page 3 | 0.4 ppt | 1 ppt | 4 ppt from 2029 | Below the health goal |
| pHaverage · range 7.2 to 8.1 · Wells · 2025 report, page 3 | 7.8 | — | — | Normal range |
| Sulfateaverage · range 2.2 to 14.8 · Wells · 2025 report, page 3 | 8.7 ppm | — | 250 ppm guideline | Within the guideline |
| Total dissolved solidsaverage · range 170 to 430 · Wells · 2025 report, page 3 | 282 ppm | — | 500 ppm guideline | Within the guideline |
| Turbidity (cloudiness)average · range ND to 0.95 · Wells · 2025 report, page 3 | 0.18 NTU | None set | 1 NTU | Below the legal limit |
| Alkalinityaverage · range 80 to 220 · Wells · 2025 report, page 3 | 150 ppm | None set | None | No health limit |
| Calciumaverage · range 13 to 55 · Wells · 2025 report, page 3 | 35 ppm | None set | None | No health limit |
| Conductivityaverage · range 185 to 515 · Wells · 2025 report, page 3 | 369 µS/cm | None set | None | No health limit |
| Hardnessaverage · range 3.34 to 12.1 · Wells · 2025 report, page 2 | 8.25 gpg (141 ppm) | — | — | Hard |
| Magnesiumaverage · range 6 to 19 · Wells · 2025 report, page 3 | 13 ppm | None set | None | No health limit |
| PFBS (a PFAS)average · range ND to 2.6 · Wells · 2025 report, page 3 | 0.1 ppt | None set | None | No health limit |
| PFHxA (a PFAS)average · range ND to 2.1 · Wells · 2025 report, page 3 | 0.1 ppt | None set | None | No health limit |
| Sodiumaverage · range 14 to 26 · Wells · 2025 report, page 2 | 19 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.
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), Uranium
What removes it: Reverse osmosis.
Lead
Found: Lead
What removes it: Certified carbon block or RO.
PFAS ("forever chemicals")
Found: PFOA (a PFAS)
What removes it: Reverse osmosis.
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