We read 26 results from Gswc-South Arcadia’s 2025 water quality report. No results over a legal limit; 4 above a health goal or guideline.
Serves about 27,072 people · Water system ID CA1910212 · 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 0.83 to 8.5 · Wells · 2025 report, page 8 | 4.4 ppb | 0.02 ppb | 10 ppb | Above the health goal220x the health goal |
| PFOA (a PFAS)highest measured · range ND to 9.2 · Wells · 2025 report, page 8 | 9.2 ppt | 0.007 ppt | 4 ppt from 2029 | Above the federal limit that takes effect in 20292.3x 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. |
| PFOS (a PFAS)average · range ND to 20 · Wells · 2025 report, page 8 | 6 ppt | 1 ppt | 4 ppt from 2029 | Above the federal limit that takes effect in 20291.5x 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 4.32 · printed as 1.8 pCi/L · sampled 2024 · Wells · 2025 report, page 8 | 2.68 ppb | 0.6 ppb | 30 ppb | Above the health goal4.5x the health goal |
| Chlorideaverage · range 5.8 to 22 · Wells · 2025 report, page 8 | 13 ppm | — | 250 ppm guideline | Within the guideline |
| Chlorineaverage · range 0.2 to 2.2 · Distribution system · 2025 report, page 9 | 1.4 ppm | None set | 4 ppm | Below the legal limit |
| Copper90th percentile of 31 homes tested, 0 over the action level · sampled 2023 · Customer taps · 2025 report, page 9 | 0.28 ppm | 0.3 ppm | 1.3 ppm (action level) | Below the health goal |
| Disinfection byproducts (HAA5)average · range ND to 1.3 · Distribution system · 2025 report, page 9 | Not detected | None set | 60 ppb | Not detected |
| Disinfection byproducts (TTHM)average · range ND to 13 · Distribution system · 2025 report, page 9 | 7.2 ppb | None set | 80 ppb | Below the legal limit |
| Fluorideaverage · range 0.4 to 0.8 · Wells · 2025 report, page 8 | 0.6 ppm | 1 ppm | 2 ppm | Below the health goal |
| Lead90th percentile of 31 homes tested, 0 over the action level · sampled 2023 · Customer taps · 2025 report, page 9 | Not detected | 0.2 ppb | 15 ppb (action level) | Not detected |
| Nitrate (as N)average · range ND to 4.3 · Wells · 2025 report, page 8 | 1.6 ppm | 10 ppm | 10 ppm | Below the health goal |
| Perchlorateaverage · range ND to 1.2 · Wells · 2025 report, page 8 | Not detected | 1 ppb | 6 ppb | Not detected |
| PFHxS (a PFAS)highest measured · range ND to 6.6 · Wells · 2025 report, page 8 | 6.6 ppt | None set | 10 ppt from 2029 | Below the legal limit |
| pHaverage · range 8 to 8.2 · Wells · 2025 report, page 8 | 8.1 | — | — | Normal range |
| Sulfateaverage · range 15 to 28 · Wells · 2025 report, page 8 | 21 ppm | — | 250 ppm guideline | Within the guideline |
| Tetrachloroethylene (PCE)average · range ND to 1.2 · Wells · 2025 report, page 8 | Not detected | 0.06 ppb | 5 ppb | Not detected |
| Total dissolved solidsaverage · range 210 to 280 · Wells · 2025 report, page 8 | 230 ppm | — | 500 ppm guideline | Within the guideline |
| Turbidity (cloudiness)average · range 0.15 to 0.45 · Wells · 2025 report, page 8 | 0.29 NTU | None set | 1 NTU | Below the legal limit |
| Alkalinityaverage · range 130 to 180 · Wells · 2025 report, page 8 | 170 ppm | None set | None | No health limit |
| Calciumaverage · range 37 to 54 · Wells · 2025 report, page 8 | 47 ppm | None set | None | No health limit |
| Conductivityaverage · range 360 to 470 · Wells · 2025 report, page 8 | 420 µS/cm | None set | None | No health limit |
| Hardnessaverage · range 6.43 to 11.7 · Wells · 2025 report, page 8 | 9.36 gpg (160 ppm) | — | — | Hard |
| Magnesiumaverage · range 5 to 16 · Wells · 2025 report, page 8 | 11 ppm | None set | None | No health limit |
| PFBA (a PFAS)highest measured · range ND to 6.2 · Wells · 2025 report, page 8 | 6.2 ppt | None set | None | No health limit |
| Sodiumaverage · range 15 to 29 · Wells · 2025 report, page 8 | 20 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 Gswc-South Arcadia’s water between Sep 2023 and Jul 2024. These are EPA lab results, separate from the district’s report. Anything not listed was not detected.
- PFOA5.5 pptFound in 4 of 10 samples · highest resultAbove the federal limit that takes effect in 2029 (4 ppt)
- PFOS22 pptFound in 6 of 10 samples · highest resultAbove the federal limit that takes effect in 2029 (4 ppt)
- PFHxS7 pptFound in 6 of 10 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: PFOA (a PFAS), PFOS (a PFAS), PFOA (EPA testing), PFOS (EPA testing)
What removes it: Reverse osmosis.
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