We read 13 results from Cwsc King City’s 2025 water quality report. No results over a legal limit; 1 above a health goal or guideline.
Serves about 16,334 people · Water system ID CA2710009 · 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 0.7 to 1.7 · 2025 report, page 13 | 1.2 ppb | 0.02 ppb | 10 ppb | Above the health goal60x the health goal |
| Chlorideaverage · range 18 to 22 · 2025 report, page 14 | 20 ppm | — | 250 ppm guideline | Within the guideline |
| Chlorineaverage · range 0.21 to 1.5 · 2025 report, page 14 | 0.73 ppm | None set | 4 ppm | Below the legal limit |
| Copper90th percentile of 32 homes tested, 0 over the action level · sampled 2023 · 2025 report, page 13 | 0.26 ppm | 0.3 ppm | 1.3 ppm (action level) | Below the health goal |
| Disinfection byproducts (TTHM)highest running annual average · range 2.8 to 6.1 · 2025 report, page 14 | 6.1 ppb | None set | 80 ppb | Below the legal limit |
| Fluorideaverage · range 0.12 to 0.32 · 2025 report, page 13 | 0.22 ppm | 1 ppm | 2 ppm | Below the health goal |
| Lead90th percentile of 32 homes tested, 0 over the action level · sampled 2023 · 2025 report, page 13 | Not detected | 0.2 ppb | 15 ppb (action level) | Not detected |
| Nitrate (as N)average · range 1.1 to 5.5 · 2025 report, page 13 | 2.1 ppm | 10 ppm | 10 ppm | Below the health goal |
| Sulfateaverage · range 74 to 89 · 2025 report, page 14 | 81 ppm | — | 250 ppm guideline | Within the guideline |
| Total dissolved solidsaverage · range 280 to 460 · 2025 report, page 14 | 347 ppm | — | 500 ppm guideline | Within the guideline |
| Boronsingle sample · sampled 2020 · 2025 report, page 14 | 0.1 ppm | None set | None | No health limit |
| Conductivityaverage · range 470 to 570 · 2025 report, page 14 | 520 µS/cm | None set | None | No health limit |
| Vanadiumaverage · range 3 to 5.3 · sampled 2020 · 2025 report, page 14 | 4.2 ppb | 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 Cwsc King City’s water between Jan 2025 and Jul 2025. These are EPA lab results, separate from the district’s report. Anything not listed was not detected.
- Lithium16 ppbFound in 12 of 12 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.
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