We read 19 results from Sfpuc City Distribution Division’s 2025 water quality report. No results over a legal limit; 4 above a health goal or guideline.
Serves about 848,019 people · Water system ID CA3810011 · 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 |
|---|---|---|---|---|
| Bromatehighest running annual average · range 1.9 to 4.1 · Treatment plants · 2025 report, page 11 | 3.5 ppb | 0.1 ppb | 10 ppb | Above the health goal35x the health goal |
| Chromium-6average · range ND to 0.1 · System-wide · 2025 report, page 11 | 0.1 ppb | 0.02 ppb | 10 ppb | Above the health goal5x the health goal |
| Lead90th percentile of 50 homes tested, 0 over the action level · sampled 2024 · Customer taps (50 homes) · 2025 report, page 11 | 4.9 ppb | 0.2 ppb | 15 ppb (action level) | Above the health goal25x the health goal |
| pHaverage · range 9 to 9.7 · System-wide · 2025 report, page 11 | 9.3 | — | — | Outside the normal rangeAlkaline water can leave scale |
| Chloraminehighest running annual average · range ND to 3.6 · Distribution system · 2025 report, page 11 | 2.6 ppm | None set | 4 ppm | Below the legal limit |
| Chlorideaverage · range ND to 19 · System-wide · 2025 report, page 11 | 10 ppm | — | 250 ppm guideline | Within the guideline |
| Copper90th percentile of 50 homes tested · printed as 72 ppb · sampled 2024 · Customer taps (50 homes) · 2025 report, page 11 | 0.07 ppm | 0.3 ppm | 1.3 ppm (action level) | Below the health goal |
| Disinfection byproducts (HAA5)highest running annual average · range 6 to 50 · Distribution system · 2025 report, page 11 | 50 ppb | None set | 60 ppb | Below the legal limit |
| Disinfection byproducts (TTHM)highest running annual average · range 12 to 65 · Distribution system · 2025 report, page 11 | 65 ppb | None set | 80 ppb | Below the legal limit |
| Fluorideaverage · range 0.5 to 0.8 · System-wide · 2025 report, page 12 | 0.7 ppm | 1 ppm | 2 ppm | Below the health goal |
| Ironaverage · range ND to 0.04 · printed as 17 ppb · System-wide · 2025 report, page 11 | 0.02 ppm | — | 0.3 ppm guideline | Within the guideline |
| Nitrate (as N)average · range ND to 0.4 · System-wide · 2025 report, page 11 | Not detected | 10 ppm | 10 ppm | Not detected |
| Sulfateaverage · range 1 to 45 · System-wide · 2025 report, page 11 | 16 ppm | — | 250 ppm guideline | Within the guideline |
| Total dissolved solidsaverage · range 24 to 197 · System-wide · 2025 report, page 11 | 95 ppm | — | 500 ppm guideline | Within the guideline |
| Turbidity (cloudiness)highest measured · Sunol Valley plant, highest of 2 sources · 2025 report, page 11 | 0.3 NTU | None set | 1 NTU | Below the legal limit |
| Boronaverage · range 0.02 to 0.07 · printed as 43 ppb · System-wide · 2025 report, page 11 | 0.04 ppm | None set | None | No health limit |
| Chlorateaverage · range ND to 281 · System-wide · 2025 report, page 11 | 80 ppb | None set | None | No health limit |
| Hardnessaverage · range 0.47 to 6.55 · System-wide · 2025 report, page 11 | 3.63 gpg (62 ppm) | — | — | Moderately hard |
| Sodiumaverage · range 3.1 to 29 · System-wide · 2025 report, page 11 | 18 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. 1 number we weren’t sure about is held back until a person checks.
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.
Lead
Found: Lead
What removes it: Certified carbon block or RO.
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