We read 17 results from Marina Coast Water District’s 2025 water quality report. No results over a legal limit; 4 above a health goal or guideline.
Serves about 38,377 people · Water system ID CA2710017 · 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 |
|---|---|---|---|---|
| Arsenicaverage · range ND to 8.7 · listed as a violation in the report · Wells · 2025 report, page 7 | 3.8 ppb | 0.004 ppb | 10 ppb | Above the health goal950x the health goal |
| Chromium-6average · range ND to 5.5 · listed as a violation in the report · Wells · 2025 report, page 7 | 3 ppb | 0.02 ppb | 10 ppb | Above the health goal150x the health goal |
| Gross alpha (radioactivity)average · range ND to 7.43 · listed as a violation in the report · Wells · 2025 report, page 7 | 2.8 pCi/L | 0 pCi/L | 15 pCi/L | Above the health goalThe health goal is zero |
| Uraniumaverage · range ND to 8.49 · listed as a violation in the report · printed as 1.6 pCi/L · Wells · 2025 report, page 7 | 2.38 ppb | 0.6 ppb | 30 ppb | Above the health goal4x the health goal |
| Chlorideaverage · range 59 to 180 · Wells · 2025 report, page 7 | 104 ppm | — | 250 ppm guideline | Within the guideline |
| Chlorineaverage · range 0.59 to 1.5 · listed as a violation in the report · Distribution system · 2025 report, page 6 | 0.94 ppm | None set | 4 ppm | Below the legal limit |
| Copper90th percentile of 30 homes tested, 0 over the action level · listed as a violation in the report · Customer taps · 2025 report, page 6 | 0.22 ppm | 0.3 ppm | 1.3 ppm (action level) | Below the health goal |
| Disinfection byproducts (TTHM)highest running annual average · range 3.1 to 9.9 · listed as a violation in the report · Distribution system · 2025 report, page 6 | 9.23 ppb | None set | 80 ppb | Below the legal limit |
| Fluorideaverage · range 0.13 to 0.64 · listed as a violation in the report · Wells · 2025 report, page 7 | 0.2 ppm | 1 ppm | 2 ppm | Below the health goal |
| Lead90th percentile of 30 homes tested, 0 over the action level · listed as a violation in the report · Customer taps · 2025 report, page 6 | Not detected | 0.2 ppb | 15 ppb (action level) | Not detected |
| Nitrate (as N)average · range ND to 5.1 · listed as a violation in the report · Wells · 2025 report, page 7 | 1.9 ppm | 10 ppm | 10 ppm | Below the health goal |
| Sulfateaverage · range 33 to 60 · Wells · 2025 report, page 7 | 50.7 ppm | — | 250 ppm guideline | Within the guideline |
| Total dissolved solidsaverage · range 340 to 720 · Wells · 2025 report, page 7 | 456 ppm | — | 500 ppm guideline | Within the guideline |
| Trichloroethylene (TCE)average · range ND to 1.5 · listed as a violation in the report · Wells · 2025 report, page 7 | 0.4 ppb | 1.7 ppb | 5 ppb | Below the health goal |
| Hardnessaverage · range 4.91 to 19.3 · Wells · 2025 report, page 7 | 10.5 gpg (180 ppm) | — | — | Very hard |
| Lithiumaverage · range 21.8 to 40.9 · sampled 2023 · Wells · 2025 report, page 6 | 28.9 ppb | None set | None | No health limit |
| Sodiumaverage · range 42 to 110 · Wells · 2025 report, page 7 | 69.4 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 Marina Coast Water District’s water between Feb 2023 and Aug 2023. These are EPA lab results, separate from the district’s report. Anything not listed was not detected.
- Lithium40.9 ppbFound in 6 of 6 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.
Radium and uranium
Found: Gross alpha (radioactivity), Uranium
What removes it: Reverse osmosis.
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