We read 14 results from Golden State Wc - Placentia/Yorba Linda’s 2025 water quality report. No results over a legal limit; 3 above a health goal or guideline.
Serves about 50,196 people · Water system ID CA3010035 · 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 |
|---|---|---|---|---|
| Bromateaverage · range ND to 8.4 · Distribution system · 2025 report, page 9 | 2.4 ppb | 0.1 ppb | 10 ppb | Above the health goal24x the health goal |
| PFOA (a PFAS)average · range ND to 8.1 · Sources · 2025 report, page 8 | 2.8 ppt | 0.007 ppt | 4 ppt from 2029 | Above the health goal400x the health goal |
| PFOS (a PFAS)average · range ND to 7.8 · Sources · 2025 report, page 8 | 2.9 ppt | 1 ppt | 4 ppt from 2029 | Above the health goal2.9x the health goal |
| Chlorideaverage · range 19.2 to 103 · Sources · 2025 report, page 8 | 66.7 ppm | — | 250 ppm guideline | Within the guideline |
| Chlorineaverage · range ND to 3.7 · Distribution system · 2025 report, page 9 | 1.7 ppm | None set | 4 ppm | Below the legal limit |
| Copper90th percentile of 32 homes tested, 0 over the action level · Customer taps · 2025 report, page 9 | 0.12 ppm | 0.3 ppm | 1.3 ppm (action level) | Below the health goal |
| Disinfection byproducts (HAA5)average · range ND to 8 · Distribution system · 2025 report, page 9 | 6 ppb | None set | 60 ppb | Below the legal limit |
| Lead90th percentile of 32 homes tested, 0 over the action level · Customer taps · 2025 report, page 9 | Not detected | 0.2 ppb | 15 ppb (action level) | Not detected |
| Sulfateaverage · range 22.9 to 218 · Sources · 2025 report, page 8 | 97.8 ppm | — | 250 ppm guideline | Within the guideline |
| Total dissolved solidsaverage · range 144 to 780 · Sources · 2025 report, page 8 | 418 ppm | — | 500 ppm guideline | Within the guideline |
| Conductivityaverage · range 259 to 1,090 · Sources · 2025 report, page 8 | 677 µS/cm | None set | None | No health limit |
| Hardnessaverage · range 3.92 to 17.5 · Sources · 2025 report, page 8 | 11 gpg (188 ppm) | — | — | Very hard |
| Lithiumaverage · range ND to 35 · Sources · 2025 report, page 8 | 14 ppb | None set | None | No health limit |
| Sodiumaverage · range 24 to 120 · Sources · 2025 report, page 8 | 69 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. 1 number we weren’t sure about is held back until a person checks.
EPA testing for PFAS and lithium
EPA’s own nationwide testing (UCMR 5) found these in Golden State Wc - Placentia/Yorba Linda’s water between Mar 2023 and Jan 2025. These are EPA lab results, separate from the district’s report. Anything not listed was not detected.
- PFOA6 pptFound in 2 of 10 samples · highest resultAbove the federal limit that takes effect in 2029 (4 ppt)
- PFOS6.5 pptFound in 2 of 10 samples · highest resultAbove the federal limit that takes effect in 2029 (4 ppt)
- PFHxS3.6 pptFound in 1 of 10 samples · highest resultNo federal limit in force for this one
- PFBS5.6 pptFound in 2 of 10 samples · highest resultNo federal limit in force for this one
- Lithium35.3 ppbFound in 6 of 10 samples · highest resultAbove EPA’s health reference level of 10 ppb (a guide, not a legal limit)
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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