We read 11 results from City of Pittsburg’s 2025 water quality report. No results over a legal limit; 1 above a health goal or guideline.
Serves about 62,500 people · Water system ID CA0710008 · 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 |
|---|---|---|---|---|
| Chloritehighest running annual average · range 0.2 to 0.4 · Distribution system · 2025 report, page 6 | 0.3 ppm | 0.05 ppm | 1 ppm | Above the health goal6x the health goal |
| Aluminumaverage · range ND to 0.06 · Treatment plant · 2025 report, page 6 | Not detected | — | 0.2 ppm guideline | Not detected |
| Chloraminehighest running annual average · range 0.2 to 2.2 · Distribution system · 2025 report, page 6 | 1.5 ppm | None set | 4 ppm | Below the legal limit |
| Copper90th percentile of 45 homes tested, 0 over the action level · sampled 2024 · Customer taps · 2025 report, page 6 | Not detected | 0.3 ppm | 1.3 ppm (action level) | Not detected |
| Disinfection byproducts (HAA5)highest running annual average · range 5.2 to 15 · Distribution system · 2025 report, page 6 | 11 ppb | None set | 60 ppb | Below the legal limit |
| Disinfection byproducts (TTHM)highest running annual average · range 37 to 57 · Distribution system · 2025 report, page 6 | 52 ppb | None set | 80 ppb | Below the legal limit |
| Fluorideaverage · range 0.6 to 0.8 · Treatment plant · 2025 report, page 6 | 0.7 ppm | 1 ppm | 2 ppm | Below the health goal |
| Lead90th percentile of 45 homes tested, 1 over the action level · sampled 2024 · Customer taps · 2025 report, page 6 | Not detected | 0.2 ppb | 15 ppb (action level) | Not detected |
| Nitrate (as N)average · range ND to 0.4 · Treatment plant · 2025 report, page 6 | Not detected | 10 ppm | 10 ppm | Not detected |
| Turbidity (cloudiness)highest measured · Treatment plant · 2025 report, page 6 | 0.2 NTU | None set | 1 NTU | Below the legal limit |
| Lithiumaverage · range ND to 23 · Treatment plant (UCMR5) · 2025 report, page 7 | 11.5 ppb | 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.
EPA testing for PFAS and lithium
EPA’s own nationwide testing (UCMR 5) found these in City of Pittsburg’s water between Jul 2023 and Apr 2024. These are EPA lab results, separate from the district’s report. Anything not listed was not detected.
- Lithium22.9 ppbFound in 3 of 4 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.
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