We read 9 results from Dublin San Ramon Services District’s 2025 water quality report. No results over a legal limit; 1 above a health goal or guideline.
Serves about 98,776 people · Water system ID CA0110009 · 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 |
|---|---|---|---|---|
| Copper90th percentile of 31 homes tested, 0 over the action level · Customer taps · 2025 report, page 13 | 0.31 ppm | 0.3 ppm | 1.3 ppm (action level) | Above the health goal1x the health goal |
| Chloraminehighest running annual average · range 1.89 to 2.41 · DSRSD distribution system · 2025 report, page 10 | 2.14 ppm | None set | 4 ppm | Below the legal limit |
| Chlorideaverage · range 24 to 157 · Surface water supply · 2025 report, page 11 | 58 ppm | — | 250 ppm guideline | Within the guideline |
| Disinfection byproducts (HAA5)highest running annual average · range ND to 42 · DSRSD distribution system · 2025 report, page 10 | 31 ppb | None set | 60 ppb | Below the legal limit |
| Disinfection byproducts (TTHM)highest running annual average · range 4 to 78 · DSRSD distribution system · 2025 report, page 10 | 66 ppb | None set | 80 ppb | Below the legal limit |
| Fluorideaverage · range 0.3 to 1.1 · DSRSD distribution system · 2025 report, page 10 | 0.83 ppm | 1 ppm | 2 ppm | Below the health goal |
| Lead90th percentile of 31 homes tested, 0 over the action level · Customer taps · 2025 report, page 13 | Not detected | 0.2 ppb | 15 ppb (action level) | Not detected |
| Total dissolved solidsaverage · range 145 to 375 · Surface water supply · 2025 report, page 11 | 238 ppm | — | 500 ppm guideline | Within the guideline |
| Turbidity (cloudiness)highest measured · Zone 7 surface water · 2025 report, page 10 | 0.1 NTU | None set | 1 NTU | Below the legal 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.
Copper
Found: Copper
What removes it: Reverse osmosis.
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