We read 18 results from St Mary Pws’s 2025 water quality report. No results over a legal limit; 1 above a health goal or guideline.
Serves about 350 people · Water system ID MO4010718 · 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 | 3.25 ppb | 0.2 ppb | 15 ppb (action level) | Above the health goal16x the health goal |
| Aluminumhighest measured · range 0.01 to 0.01 · Purchased water (wholesaler) · 2025 report, page 3 | 0.01 ppm | — | 0.2 ppm guideline | Within the guideline |
| Bariumhighest measured · range 0.01 to 0.01 · Purchased water (wholesaler) · 2025 report, page 2 | 0.01 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 | 0.16 ppm | 0.3 ppm | 1.3 ppm (action level) | Below the health goal |
| Fluoridehighest measured · range 0.11 to 0.11 · Purchased water (wholesaler) · 2025 report, page 2 | 0.11 ppm | 1 ppm | 4 ppm | Below the health goal |
| Nitrate (as N)highest measured · range 0.09 to 0.85 · Purchased water (wholesaler) · 2025 report, page 2 | 0.85 ppm | 10 ppm | 10 ppm | Below the health goal |
| pHhighest measured · range 8.13 to 8.13 · Purchased water (wholesaler) · 2025 report, page 3 | 8.13 | — | — | Normal range |
| Sulfatehighest measured · range 27 to 27 · Purchased water (wholesaler) · 2025 report, page 3 | 27 ppm | — | 250 ppm guideline | Within the guideline |
| Total dissolved solidshighest measured · range 340 to 340 · Purchased water (wholesaler) · 2025 report, page 3 | 340 ppm | — | 500 ppm guideline | Within the guideline |
| Zinchighest measured · range 0.18 to 0.18 · Purchased water (wholesaler) · 2025 report, page 3 | 0.18 ppm | — | 5 ppm guideline | Within the guideline |
| Alkalinityhighest measured · range 346 to 346 · Purchased water (wholesaler) · 2025 report, page 3 | 346 ppm | None set | None | No health limit |
| Calciumhighest measured · range 66 to 66 · Purchased water (wholesaler) · 2025 report, page 3 | 66 ppm | None set | None | No health limit |
| Hardnesshighest measured · range 20.8 to 20.8 · Purchased water (wholesaler) · 2025 report, page 3 | 20.8 gpg (356 ppm) | — | — | Very hard |
| Lithiumhighest measured · range ND to 12.4 · sampled 2023 · Purchased water (wholesaler) · 2025 report, page 3 | 12.4 ppb | None set | None | No health limit |
| Magnesiumhighest measured · range 46.6 to 46.6 · Purchased water (wholesaler) · 2025 report, page 3 | 46.6 ppm | None set | None | No health limit |
| Nickelhighest measured · range 1.79 to 1.79 · printed as 0.00179 MG/L · Purchased water (wholesaler) · 2025 report, page 3 | 1.79 ppb | None set | None | No health limit |
| Potassiumhighest measured · range 1.51 to 1.51 · Purchased water (wholesaler) · 2025 report, page 3 | 1.51 ppm | None set | None | No health limit |
| Sodiumhighest measured · range 4.38 to 4.38 · Purchased water (wholesaler) · 2025 report, page 3 | 4.38 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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