We read 14 results from Uc - Davis’s 2025 water quality report. No results over a legal limit; 1 above a health goal or guideline.
Serves about 49,616 people · Water system ID CA5710009 · 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 |
|---|---|---|---|---|
| Arsenicaverage · range 2.4 to 7 · sampled 2024 · UC Davis wells · 2025 report, page 7 | 4.1 ppb | 0.004 ppb | 10 ppb | Above the health goal1,025x the health goal |
| Chlorideaverage · range 14 to 23 · sampled 2023 · UC Davis wells · 2025 report, page 8 | 20 ppm | — | 250 ppm guideline | Within the guideline |
| Chlorineaverage · range 0.05 to 1.47 · Distribution system · 2025 report, page 8 | 0.82 ppm | None set | 4 ppm | Below the legal limit |
| Copper90th percentile of 61 homes tested, 0 over the action level · sampled 2023 · Customer taps · 2025 report, page 9 | 0.15 ppm | 0.3 ppm | 1.3 ppm (action level) | Below the health goal |
| Disinfection byproducts (HAA5)average · range ND to 17 · Distribution system · 2025 report, page 8 | 14 ppb | None set | 60 ppb | Below the legal limit |
| Disinfection byproducts (TTHM)average · range 3.6 to 39 · Distribution system · 2025 report, page 8 | 29 ppb | None set | 80 ppb | Below the legal limit |
| Fluorideaverage · range 0.11 to 0.16 · sampled 2023 · UC Davis wells · 2025 report, page 7 | 0.13 ppm | 1 ppm | 2 ppm | Below the health goal |
| Lead90th percentile of 61 homes tested, 1 over the action level · sampled 2023 · Customer taps · 2025 report, page 9 | Not detected | 0.2 ppb | 15 ppb (action level) | Not detected |
| Sulfateaverage · range 28 to 37 · sampled 2023 · UC Davis wells · 2025 report, page 8 | 33 ppm | — | 250 ppm guideline | Within the guideline |
| Total dissolved solidsaverage · range 310 to 330 · sampled 2023 · UC Davis wells · 2025 report, page 8 | 320 ppm | — | 500 ppm guideline | Within the guideline |
| Conductivityaverage · range 510 to 570 · sampled 2023 · UC Davis wells · 2025 report, page 8 | 546 µS/cm | None set | None | No health limit |
| Hardnessaverage · range 4.5 to 8.77 · sampled 2023 · UC Davis wells · 2025 report, page 9 | 6.96 gpg (119 ppm) | — | — | Moderately hard |
| Lithiumaverage · range ND to 30 · sampled 2023 · UC Davis wells · 2025 report, page 9 | 22.6 ppb | None set | None | No health limit |
| Sodiumaverage · range 68 to 95 · sampled 2023 · UC Davis wells · 2025 report, page 9 | 76 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.
EPA testing for PFAS and lithium
EPA’s own nationwide testing (UCMR 5) found these in Uc - Davis’s water between Apr 2023 and Apr 2024. These are EPA lab results, separate from the district’s report. Anything not listed was not detected.
- Lithium30 ppbFound in 9 of 15 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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