We read 18 results from City of Arcadia’s 2025 water quality report. No results over a legal limit; 3 above a health goal or guideline.
Serves about 51,361 people · Water system ID CA1910003 · 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 0.56 to 9 · Wells · 2025 report, page 4 | 3 ppb | 0.02 ppb | 10 ppb | Above the health goal150x the health goal |
| PFOS (a PFAS)average · range ND to 8.4 · Wells · 2025 report, page 4 | 7.6 ppt | 1 ppt | 4 ppt from 2029 | Above the federal limit that takes effect in 20291.9x the 4 ppt federal limit that takes effect in 2029Not a violation yet: EPA's 4 ppt limit is final, but water systems don't have to meet it until 2029. |
| Uraniumaverage · range ND to 7.75 · printed as 2.5 pCi/L · Wells · 2025 report, page 4 | 3.73 ppb | 0.6 ppb | 30 ppb | Above the health goal6.2x the health goal |
| Arsenicaverage · range ND to 6.4 · Wells · 2025 report, page 4 | Not detected | 0.004 ppb | 10 ppb | Not detected |
| Chlorideaverage · range 8.9 to 55 · Wells · 2025 report, page 4 | 31 ppm | — | 250 ppm guideline | Within the guideline |
| Chlorineaverage · range 0.19 to 1.6 · Distribution system · 2025 report, page 4 | 0.96 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 4 | 0.29 ppm | 0.3 ppm | 1.3 ppm (action level) | Below the health goal |
| Disinfection byproducts (HAA5)highest running annual average · range ND to 3 · Distribution system · 2025 report, page 4 | 2 ppb | None set | 60 ppb | Below the legal limit |
| Disinfection byproducts (TTHM)highest running annual average · range 3.6 to 14 · Distribution system · 2025 report, page 4 | 11 ppb | None set | 80 ppb | Below the legal limit |
| Fluorideaverage · range 0.28 to 1.2 · Wells · 2025 report, page 4 | 0.56 ppm | 1 ppm | 2 ppm | Below the health goal |
| Ironaverage · range ND to 0.04 · printed as 8.6 ug/L · Wells · 2025 report, page 4 | 0.0086 ppm | — | 0.3 ppm guideline | Within the guideline |
| Lead90th percentile of 30 homes tested, 0 over the action level · Customer taps · 2025 report, page 4 | Not detected | 0.2 ppb | 15 ppb (action level) | Not detected |
| Nitrate (as N)average · range 0.83 to 4.4 · Wells · 2025 report, page 4 | 1.9 ppm | 10 ppm | 10 ppm | Below the health goal |
| Perchlorateaverage · range ND to 2.2 · Wells · 2025 report, page 4 | Not detected | 1 ppb | 6 ppb | Not detected |
| Sulfateaverage · range 18 to 100 · Wells · 2025 report, page 4 | 54 ppm | — | 250 ppm guideline | Within the guideline |
| Total dissolved solidsaverage · range 180 to 490 · Wells · 2025 report, page 4 | 330 ppm | — | 500 ppm guideline | Within the guideline |
| Hardnessaverage · range 1.35 to 19.9 · Wells · 2025 report, page 4 | 12.3 gpg (210 ppm) | — | — | Very hard |
| Sodiumaverage · range 17 to 53 · Wells · 2025 report, page 4 | 29 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 City of Arcadia’s water between Aug 2023 and Aug 2024. These are EPA lab results, separate from the district’s report. Anything not listed was not detected.
- PFOS10 pptFound in 3 of 18 samples · highest resultAbove the federal limit that takes effect in 2029 (4 ppt)
- PFHxS4.8 pptFound in 1 of 18 samples · highest resultNo federal limit in force for this one
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: PFOS (a PFAS), PFOS (EPA testing)
What removes it: Reverse osmosis.
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