We read 6 results from City of San Jose - Nsj/Alviso’s 2025 water quality report. No results over a legal limit; 2 above a health goal or guideline.
Serves about 45,559 people · Water system ID CA4310019 · 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 |
|---|---|---|---|---|
| Bromateaverage · range 1.9 to 4.1 · SFPUC treated water (NSJ/Alviso) · 2025 report, page 15 | 3.5 ppb | 0.1 ppb | 10 ppb | Above the health goal35x the health goal |
| Chromium-6average · range ND to 0.1 · SFPUC treated water (NSJ/Alviso) · 2025 report, page 15 | 0.1 ppb | 0.02 ppb | 10 ppb | Above the health goal5x the health goal |
| Chloramineaverage · range 0.03 to 3.9 · NSJ/Alviso distribution · 2025 report, page 15 | 2.8 ppm | None set | 4 ppm | Below the legal limit |
| Disinfection byproducts (HAA5)average · range 10 to 63 · NSJ/Alviso distribution · 2025 report, page 15 | 42 ppb | None set | 60 ppb | Below the legal limit |
| Disinfection byproducts (TTHM)average · range 13 to 69 · NSJ/Alviso distribution · 2025 report, page 15 | 48 ppb | None set | 80 ppb | Below the legal limit |
| Fluorideaverage · range 0.5 to 0.8 · SFPUC treated water (NSJ/Alviso) · 2025 report, page 15 | 0.7 ppm | 1 ppm | 2 ppm | Below the health goal |
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 City of San Jose - Nsj/Alviso’s water between Mar 2023 and Dec 2023. These are EPA lab results, separate from the district’s report. Anything not listed was not detected.
- Lithium9.3 ppbFound in 3 of 8 samples · highest resultBelow EPA’s health reference level of 10 ppb
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.
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