We read 7 results from Suburban Water Systems-San Jose’s 2025 water quality report. No results over a legal limit; 1 above a health goal or guideline.
Serves about 168,843 people · Water system ID CA1910205 · 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 |
|---|---|---|---|---|
| Total coliform bacteriahighest month · Distribution system · 2025 report, page 6 | 0.6 % positive | 0 % positive | 5 % positive | Above the health goalThe health goal is zero |
| Chlorineaverage · range 0.2 to 2.8 · Distribution system · 2025 report, page 6 | 1.4 ppm | None set | 4 ppm | Below the legal limit |
| Copper90th percentile of 51 homes tested, 0 over the action level · Customer taps (51 samples) · 2025 report, page 6 | 0.25 ppm | 0.3 ppm | 1.3 ppm (action level) | Below the health goal |
| Disinfection byproducts (HAA5)highest running annual average · range 1.2 to 23 · Distribution system (8 sites) · 2025 report, page 6 | 11 ppb | None set | 60 ppb | Below the legal limit |
| Disinfection byproducts (TTHM)highest running annual average · range 9 to 47 · Distribution system (8 sites) · 2025 report, page 6 | 31 ppb | None set | 80 ppb | Below the legal limit |
| Lead90th percentile of 51 homes tested, 0 over the action level · Customer taps (51 samples) · 2025 report, page 6 | Not detected | 0.2 ppb | 15 ppb (action level) | Not detected |
| Turbidity (cloudiness)highest measured · Covina Valley Water Company - Temple, highest of 3 sources · 2025 report, page 5 | 0.2 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.
EPA testing for PFAS and lithium
EPA’s own nationwide testing (UCMR 5) found these in Suburban Water Systems-San Jose’s water between Jul 2024 and Apr 2025. These are EPA lab results, separate from the district’s report. Anything not listed was not detected.
- PFBS3.6 pptFound in 1 of 20 samples · highest resultNo federal limit in force for this one
- Lithium56 ppbFound in 8 of 20 samples · highest resultAbove EPA’s health reference level of 10 ppb (a guide, not a legal limit)
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.
Bacteria and viruses
Found: Total coliform bacteria
What removes it: UV purification (and tell your utility).
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