We read 9 results from California Water Service - Livermore’s 2025 water quality report. No results over a legal limit; 1 above a health goal or guideline.
Serves about 60,414 people · Water system ID CA0110003 · 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 |
|---|---|---|---|---|
| Chromium-6average · range 1.6 to 7.2 · Local groundwater · 2025 report, page 13 | 4.5 ppb | 0.02 ppb | 10 ppb | Above the health goal225x the health goal |
| Arsenicaverage · range ND to 5.3 · Local groundwater · 2025 report, page 13 | Not detected | 0.004 ppb | 10 ppb | Not detected |
| Bariumaverage · range 0.13 to 0.36 · Local groundwater · 2025 report, page 13 | 0.26 ppm | 2 ppm | 2 ppm | Below the health goal |
| Chloramineaverage · range 0.21 to 3.4 · Distribution system · 2025 report, page 14 | 2 ppm | None set | 4 ppm | Below the legal limit |
| Copper90th percentile of 32 homes tested, 0 over the action level · sampled 2024 · Customer taps · 2025 report, page 13 | 0.05 ppm | 0.3 ppm | 1.3 ppm (action level) | Below the health goal |
| Disinfection byproducts (HAA5)highest running annual average · range ND to 34 · Distribution system · 2025 report, page 14 | 26 ppb | None set | 60 ppb | Below the legal limit |
| Disinfection byproducts (TTHM)highest running annual average · range ND to 68 · Distribution system · 2025 report, page 14 | 44 ppb | None set | 80 ppb | Below the legal limit |
| Lead90th percentile of 32 homes tested, 1 over the action level · sampled 2024 · Customer taps · 2025 report, page 13 | Not detected | 0.2 ppb | 15 ppb (action level) | Not detected |
| Nitrate (as N)average · range 2.5 to 7.4 · Local groundwater · 2025 report, page 13 | 4.3 ppm | 10 ppm | 10 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 California Water Service - Livermore’s water between Jul 2023 and Jul 2024. These are EPA lab results, separate from the district’s report. Anything not listed was not detected.
- PFOA4.8 pptFound in 3 of 24 samples · highest resultAbove the federal limit that takes effect in 2029 (4 ppt)
- PFOS12 pptFound in 9 of 24 samples · highest resultAbove the federal limit that takes effect in 2029 (4 ppt)
- PFHxS9.8 pptFound in 11 of 24 samples · highest resultNo federal limit in force for this one
- PFBS4.2 pptFound in 8 of 24 samples · highest resultNo federal limit in force for this one
- Lithium25.1 ppbFound in 11 of 24 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.
PFAS ("forever chemicals")
Found: PFOA (EPA testing), PFOS (EPA testing)
What removes it: Reverse osmosis.
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