We read 16 results from San Gabriel County WD’s 2025 water quality report. No results over a legal limit; 5 above a health goal or guideline.
Serves about 39,345 people · Water system ID CA1910144 · 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 0.77 to 8.1 · Wells · 2025 report, page 3 | 3.5 ppb | 0.004 ppb | 10 ppb | Above the health goal875x the health goal |
| Chromium-6average · range 2.2 to 6.8 · Wells · 2025 report, page 3 | 4.2 ppb | 0.02 ppb | 10 ppb | Above the health goal210x the health goal |
| Gross alpha (radioactivity)average · range ND to 4.62 · Wells · 2025 report, page 3 | 1.82 pCi/L | 0 pCi/L | 15 pCi/L | Above the health goalThe health goal is zero |
| Tetrachloroethylene (PCE)average · range ND to 3.1 · Wells · 2025 report, page 3 | 0.94 ppb | 0.06 ppb | 5 ppb | Above the health goal16x the health goal |
| Uraniumaverage · range 0.73 to 3.87 · printed as 1.64 pCi/L · Wells · 2025 report, page 3 | 2.44 ppb | 0.6 ppb | 30 ppb | Above the health goal4.1x the health goal |
| Chlorideaverage · range 5.4 to 31 · Wells · 2025 report, page 4 | 14.2 ppm | — | 250 ppm guideline | Within the guideline |
| Chlorineaverage · range 0.65 to 1.52 · Distribution system · 2025 report, page 3 | 1.01 ppm | None set | 4 ppm | Below the legal limit |
| Copper90th percentile of 30 homes tested, 0 over the action level · Customer taps · 2025 report, page 3 | 0.13 ppm | 0.3 ppm | 1.3 ppm (action level) | Below the health goal |
| Disinfection byproducts (TTHM)average · range ND to 6.5 · Distribution system · 2025 report, page 3 | 3.96 ppb | None set | 80 ppb | Below the legal limit |
| Fluorideaverage · range 0.7 to 1.5 · Wells · 2025 report, page 3 | 0.91 ppm | 1 ppm | 2 ppm | Below the health goal |
| Lead90th percentile of 30 homes tested, 0 over the action level · printed as ND ppm · Customer taps · 2025 report, page 3 | Not detected | 0.2 ppb | 15 ppb (action level) | Not detected |
| Nitrate (as N)average · range ND to 7.7 · Wells · 2025 report, page 3 | 3.4 ppm | 10 ppm | 10 ppm | Below the health goal |
| Perchlorateaverage · range ND to 1.3 · Wells · 2025 report, page 3 | 0.11 ppb | 1 ppb | 6 ppb | Below the health goal |
| Sulfateaverage · range 15 to 65 · Wells · 2025 report, page 4 | 30.8 ppm | — | 250 ppm guideline | Within the guideline |
| Total dissolved solidsaverage · range 160 to 300 · Wells · 2025 report, page 4 | 230 ppm | — | 500 ppm guideline | Within the guideline |
| Trichloroethylene (TCE)average · range ND to 0.91 · Wells · 2025 report, page 3 | 0.22 ppb | 1.7 ppb | 5 ppb | 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.
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.
Radium and uranium
Found: Gross alpha (radioactivity), Uranium
What removes it: Reverse osmosis.
Industrial chemicals and pesticides
Found: Tetrachloroethylene (PCE)
What removes it: Carbon block or RO.
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