We read 14 results from Azusa Light and Water’s 2025 water quality report. No results over a legal limit; 2 above a health goal or guideline.
Serves about 110,044 people · Water system ID CA1910007 · 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 |
|---|---|---|---|---|
| Copper90th percentile of 50 homes tested, 0 over the action level · printed as 480 ug/L · sampled 2023 · Customer taps · 2025 report, page 7 | 0.48 ppm | 0.3 ppm | 1.3 ppm (action level) | Above the health goal1.6x the health goal |
| Tetrachloroethylene (PCE)average · range ND to 0.7 · Groundwater · 2025 report, page 6 | 0.18 ppb | 0.06 ppb | 5 ppb | Above the health goal3x the health goal |
| Chlorideaverage · range 24 to 35 · Groundwater · 2025 report, page 6 | 28.3 ppm | — | 250 ppm guideline | Within the guideline |
| Chlorineaverage · range 0.2 to 1.31 · Distribution system · 2025 report, page 6 | 0.81 ppm | None set | 4 ppm | Below the legal limit |
| Disinfection byproducts (HAA5)highest running annual average · range 1.2 to 22 · Distribution system · 2025 report, page 6 | 15.7 ppb | None set | 60 ppb | Below the legal limit |
| Disinfection byproducts (TTHM)highest running annual average · range 10 to 42 · Distribution system · 2025 report, page 6 | 53.5 ppb | None set | 80 ppb | Below the legal limit |
| Lead90th percentile of 50 homes tested, 0 over the action level · sampled 2023 · Customer taps · 2025 report, page 7 | Not detected | 0.2 ppb | 15 ppb (action level) | Not detected |
| Sulfateaverage · range 20 to 63 · Groundwater · 2025 report, page 6 | 29.7 ppm | — | 250 ppm guideline | Within the guideline |
| Total coliform bacteriahighest month · Distribution system · 2025 report, page 6 | Not detected | 0 % positive | 5 % positive | Not detected |
| Total dissolved solidsaverage · range 210 to 460 · Groundwater · 2025 report, page 6 | 267 ppm | — | 500 ppm guideline | Within the guideline |
| Turbidity (cloudiness)highest measured · range 0.01 to 0.03 · Surface water plant · 2025 report, page 6 | 0.03 NTU | None set | 1 NTU | Below the legal limit |
| Conductivityaverage · range 390 to 770 · Groundwater · 2025 report, page 6 | 476 µS/cm | None set | None | No health limit |
| Hardnessaverage · range 5.79 to 15.2 · Groundwater · 2025 report, page 6 | 8.25 gpg (141 ppm) | — | — | Hard |
| Sodiumaverage · range 23 to 31 · Groundwater · 2025 report, page 6 | 27 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.
EPA testing for PFAS and lithium
EPA’s own nationwide testing (UCMR 5) found these in Azusa Light and Water’s water between Dec 2023 and Dec 2024. These are EPA lab results, separate from the district’s report. Anything not listed was not detected.
- PFOA7.7 pptFound in 2 of 12 samples · highest resultAbove the federal limit that takes effect in 2029 (4 ppt)
- PFOS5.8 pptFound in 3 of 12 samples · highest resultAbove the federal limit that takes effect in 2029 (4 ppt)
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.
Copper
Found: Copper
What removes it: Reverse osmosis.
Industrial chemicals and pesticides
Found: Tetrachloroethylene (PCE)
What removes it: Carbon block or RO.
PFAS ("forever chemicals")
Found: PFOA (EPA testing), PFOS (EPA testing)
What removes it: Reverse osmosis.
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