We read 22 results from Union Pws’s 2025 water quality report. No results over a legal limit; 6 above a health goal or guideline.
Serves about 12,348 people · Water system ID MO6010801 · 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 |
|---|---|---|---|---|
| Gross alpha (radioactivity)highest measured · range ND to 4.6 · sampled 2022 · 2025 report, page 2 | 4.6 pCi/L | 0 pCi/L | 15 pCi/L | Above the health goalThe health goal is zero |
| Lead90th percentile of homes tested, 0 over the action level · sampled 2024 · Customer taps · 2025 report, page 2 | 2.48 ppb | 0.2 ppb | 15 ppb (action level) | Above the health goal12x the health goal |
| pHhighest measured · range 7.45 to 8.72 · sampled 2023 · 2025 report, page 3 | 8.72 | — | — | Outside the normal rangeAlkaline water can leave scale |
| Radium (combined 226 + 228)highest measured · range ND to 2.4 · sampled 2022 · 2025 report, page 2 | 2.4 pCi/L | 0 pCi/L | 5 pCi/L | Above the health goalThe health goal is zero |
| Radium-226highest measured · range ND to 1.2 · sampled 2022 · 2025 report, page 2 | 1.2 pCi/L | 0.05 pCi/L | 5 pCi/L | Above the health goal24x the health goal |
| Radium-228highest measured · range ND to 1.2 · sampled 2022 · 2025 report, page 2 | 1.2 pCi/L | 0.02 pCi/L | 5 pCi/L | Above the health goal63x the health goal |
| Bariumhighest measured · range 0.15 to 0.39 · sampled 2023 · 2025 report, page 2 | 0.39 ppm | 2 ppm | 2 ppm | Below the health goal |
| Chloridehighest measured · range ND to 7.87 · sampled 2023 · 2025 report, page 3 | 7.87 ppm | — | 250 ppm guideline | Within the guideline |
| Copper90th percentile of homes tested, 0 over the action level · sampled 2024 · Customer taps · 2025 report, page 2 | 0.12 ppm | 0.3 ppm | 1.3 ppm (action level) | Below the health goal |
| Ironhighest measured · range ND to 0.11 · sampled 2023 · 2025 report, page 3 | 0.11 ppm | — | 0.3 ppm guideline | Within the guideline |
| Manganesehighest measured · range ND to 0.0062 · sampled 2023 · 2025 report, page 3 | 0.0062 ppm | — | 0.05 ppm guideline | Within the guideline |
| Nitrate (as N)highest measured · range 0.03 to 0.66 · 2025 report, page 2 | 0.66 ppm | 10 ppm | 10 ppm | Below the health goal |
| Sulfatehighest measured · range 7.28 to 24.7 · sampled 2023 · 2025 report, page 3 | 24.7 ppm | — | 250 ppm guideline | Within the guideline |
| Total dissolved solidshighest measured · range 202 to 334 · sampled 2023 · 2025 report, page 3 | 334 ppm | — | 500 ppm guideline | Within the guideline |
| Zinchighest measured · range 0.0035 to 0.11 · sampled 2023 · 2025 report, page 3 | 0.11 ppm | — | 5 ppm guideline | Within the guideline |
| Alkalinityhighest measured · range 174 to 316 · sampled 2023 · 2025 report, page 3 | 316 ppm | None set | None | No health limit |
| Calciumhighest measured · range 36.3 to 60 · sampled 2023 · 2025 report, page 3 | 60 ppm | None set | None | No health limit |
| Hardnesshighest measured · range 11.1 to 17.5 · sampled 2023 · 2025 report, page 3 | 17.5 gpg (300 ppm) | — | — | Very hard |
| Magnesiumhighest measured · range 23.5 to 36.4 · sampled 2023 · 2025 report, page 3 | 36.4 ppm | None set | None | No health limit |
| Nickelhighest measured · range ND to 6.21 · printed as 0.00621 MG/L · sampled 2023 · 2025 report, page 3 | 6.21 ppb | None set | None | No health limit |
| Potassiumhighest measured · range ND to 2.13 · sampled 2023 · 2025 report, page 3 | 2.13 ppm | None set | None | No health limit |
| Sodiumhighest measured · range 2.32 to 10.1 · sampled 2023 · 2025 report, page 3 | 10.1 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. 1 number we weren’t sure about is held back until a person checks.
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), Radium (combined 226 + 228), Radium-226, Radium-228
What removes it: Reverse osmosis.
Lead
Found: Lead
What removes it: Certified carbon block or RO.
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