We read 17 results from Mount Vernon Pws’s 2025 water quality report. No results over a legal limit; 1 above a health goal or guideline.
Serves about 4,575 people · Water system ID MO5010553 · 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 |
|---|---|---|---|---|
| Lead90th percentile of homes tested, 0 over the action level · sampled 2024 · Customer taps · 2025 report, page 2 | 2.78 ppb | 0.2 ppb | 15 ppb (action level) | Above the health goal14x the health goal |
| Bariumhighest measured · range 0.02 to 0.03 · 2025 report, page 2 | 0.03 ppm | 2 ppm | 2 ppm | Below the health goal |
| Copper90th percentile of homes tested, 0 over the action level · sampled 2024 · Customer taps · 2025 report, page 2 | 0.06 ppm | 0.3 ppm | 1.3 ppm (action level) | Below the health goal |
| Disinfection byproducts (TTHM)highest running annual average · range 1.46 to 1.46 · DBPDUAL-01 · 2025 report, page 2 | 1 ppb | None set | 80 ppb | Below the legal limit |
| Ironhighest measured · range 0.0061 to 0.04 · 2025 report, page 3 | 0.04 ppm | — | 0.3 ppm guideline | Within the guideline |
| Manganesehighest measured · range ND to 0.0019 · 2025 report, page 3 | 0.0019 ppm | — | 0.05 ppm guideline | Within the guideline |
| pHhighest measured · range 7.82 to 8.33 · 2025 report, page 3 | 8.33 | — | — | Normal range |
| Sulfatehighest measured · range 8.99 to 21.7 · 2025 report, page 3 | 21.7 ppm | — | 250 ppm guideline | Within the guideline |
| Total dissolved solidshighest measured · range 224 to 272 · 2025 report, page 3 | 272 ppm | — | 500 ppm guideline | Within the guideline |
| Zinchighest measured · range 0.009 to 0.01 · 2025 report, page 3 | 0.01 ppm | — | 5 ppm guideline | Within the guideline |
| Alkalinityhighest measured · range 226 to 274 · 2025 report, page 3 | 274 ppm | None set | None | No health limit |
| Calciumhighest measured · range 33.8 to 48.4 · 2025 report, page 3 | 48.4 ppm | None set | None | No health limit |
| Hardnesshighest measured · range 8.71 to 11.9 · 2025 report, page 3 | 11.9 gpg (204 ppm) | — | — | Very hard |
| Magnesiumhighest measured · range 15.8 to 20.2 · 2025 report, page 3 | 20.2 ppm | None set | None | No health limit |
| Nickelhighest measured · range 1.51 to 2.2 · printed as 0.0022 MG/L · 2025 report, page 3 | 2.2 ppb | None set | None | No health limit |
| Potassiumhighest measured · range 1.31 to 1.51 · 2025 report, page 3 | 1.51 ppm | None set | None | No health limit |
| Sodiumhighest measured · range 1.67 to 2.88 · 2025 report, page 3 | 2.88 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.
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.
Lead
Found: Lead
What removes it: Certified carbon block or RO.
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