We read 19 results from Glendora-City, Water Dept.’s 2025 water quality report. No results over a legal limit; 3 above a health goal or guideline.
Serves about 49,934 people · Water system ID CA1910044 · 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 ND to 1.7 · listed as a violation in the report · Wells · 2025 report, page 10 | 0.51 ppb | 0.02 ppb | 10 ppb | Above the health goal26x the health goal |
| Copper90th percentile of 32 homes tested, 0 over the action level · Customer taps · 2025 report, page 10 | 0.36 ppm | 0.3 ppm | 1.3 ppm (action level) | Above the health goal1.2x the health goal |
| Uraniumaverage · range ND to 3.13 · listed as a violation in the report · printed as 1.1 pCi/L · Wells · 2025 report, page 10 | 1.64 ppb | 0.6 ppb | 30 ppb | Above the health goal2.7x the health goal |
| Arsenicaverage · range ND to 3.1 · listed as a violation in the report · Wells · 2025 report, page 10 | Not detected | 0.004 ppb | 10 ppb | Not detected |
| Bariumaverage · range ND to 0.31 · listed as a violation in the report · Wells · 2025 report, page 10 | 0.11 ppm | 2 ppm | 2 ppm | Below the health goal |
| Chlorideaverage · range 23 to 61 · listed as a violation in the report · Wells · 2025 report, page 10 | 36 ppm | — | 250 ppm guideline | Within the guideline |
| Chlorinehighest running annual average · range 0.06 to 1.9 · listed as a violation in the report · Distribution system · 2025 report, page 10 | 0.78 ppm | None set | 4 ppm | Below the legal limit |
| Disinfection byproducts (HAA5)highest running annual average · range ND to 9.6 · listed as a violation in the report · Distribution system · 2025 report, page 10 | 6.2 ppb | None set | 60 ppb | Below the legal limit |
| Disinfection byproducts (TTHM)highest running annual average · range 1.6 to 53 · listed as a violation in the report · Distribution system · 2025 report, page 10 | 42 ppb | None set | 80 ppb | Below the legal limit |
| Fluorideaverage · range 0.2 to 0.37 · listed as a violation in the report · Wells · 2025 report, page 10 | 0.25 ppm | 1 ppm | 2 ppm | Below the health goal |
| Gross alpha (radioactivity)average · range ND to 3.8 · listed as a violation in the report · Wells · 2025 report, page 10 | Not detected | 0 pCi/L | 15 pCi/L | Not detected |
| Lead90th percentile of 32 homes tested, 0 over the action level · Customer taps · 2025 report, page 10 | Not detected | 0.2 ppb | 15 ppb (action level) | Not detected |
| Nitrate (as N)average · range ND to 1.6 · listed as a violation in the report · Wells · 2025 report, page 10 | Not detected | 10 ppm | 10 ppm | Not detected |
| Perchlorateaverage · range ND to 2 · listed as a violation in the report · Wells · 2025 report, page 10 | Not detected | 1 ppb | 6 ppb | Not detected |
| Sulfateaverage · range 19 to 77 · listed as a violation in the report · Wells · 2025 report, page 10 | 36 ppm | — | 250 ppm guideline | Within the guideline |
| Total dissolved solidsaverage · range 160 to 560 · listed as a violation in the report · Wells · 2025 report, page 10 | 300 ppm | — | 500 ppm guideline | Within the guideline |
| Conductivityaverage · range 370 to 850 · listed as a violation in the report · Wells · 2025 report, page 10 | 520 µS/cm | None set | None | No health limit |
| Hardnessaverage · range 7.02 to 21.6 · Wells · 2025 report, page 10 | 11.1 gpg (190 ppm) | — | — | Very hard |
| Sodiumaverage · range 23 to 34 · Wells · 2025 report, page 10 | 28 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.
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.
Copper
Found: Copper
What removes it: Reverse osmosis.
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