We read 7 results from Treasure Island’s 2025 water quality report. No results over a legal limit or above a health goal.
Serves about 3,864 people · Water system ID CA3810702 · 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 |
|---|---|---|---|---|
| Chlorideaverage · range ND to 19 · 2025 report, page 10 | 7.9 ppm | — | 250 ppm guideline | Within the guideline |
| Fluorideas reported · range ND to 0.9 · 2025 report, page 10 | 0.3 ppm | 1 ppm | 2 ppm | Below the health goal |
| Ironaverage · range ND to 0.04 · printed as 19 ppb · 2025 report, page 10 | 0.02 ppm | — | 0.3 ppm guideline | Within the guideline |
| Manganeseaverage · range ND to 0.0027 · printed as <2 ppb · 2025 report, page 10 | Not detected | — | 0.05 ppm guideline | Not detected |
| Nitrate (as N)as reported · range ND to 0.4 · 2025 report, page 10 | Not detected | 10 ppm | 10 ppm | Not detected |
| Sulfateaverage · range 1 to 45 · 2025 report, page 10 | 13 ppm | — | 250 ppm guideline | Within the guideline |
| Total dissolved solidsaverage · range 24 to 197 · 2025 report, page 10 | 82 ppm | — | 500 ppm guideline | Within the guideline |
Utility results describe the whole system, measured where water enters the pipes, not your tap. Your home’s plumbing can add lead or copper.
What you can do
Nothing in this report is above a health goal or legal limit. If you’re bothered by taste, smell, hardness or spots, or your home has older pipes, the filter catalog and buyer questions can help you pick, and a test of your own tap shows what your plumbing adds.
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