We read 9 results from St. John Municipal Water Utility’s 2025 water quality report. No results over a legal limit; 5 above a health goal or guideline.
Serves about 17,000 people · Water system ID IN5245043 · 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 0.32 to 0.69 · sampled 2024 · 2025 report, page 4 | 0.69 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 2023 · 2025 report, page 3 | 2.7 ppb | 0.2 ppb | 15 ppb (action level) | Above the health goal14x the health goal |
| Radium (combined 226 + 228)highest measured · range 0.43 to 0.98 · sampled 2024 · 2025 report, page 4 | 0.98 pCi/L | 0 pCi/L | 5 pCi/L | Above the health goalThe health goal is zero |
| Radium-226highest measured · range ND to 0.38 · sampled 2024 · 2025 report, page 4 | 0.38 pCi/L | 0.05 pCi/L | 5 pCi/L | Above the health goal7.6x the health goal |
| Radium-228highest measured · range 0.43 to 0.61 · sampled 2024 · 2025 report, page 4 | 0.61 pCi/L | 0.02 pCi/L | 5 pCi/L | Above the health goal32x the health goal |
| Bariumhighest measured · range 0.0068 to 0.02 · sampled 2023 · 2025 report, page 4 | 0.02 ppm | 2 ppm | 2 ppm | Below the health goal |
| Chlorinehighest running annual average · range 0.53 to 1.71 · 2025 report, page 3 | 1 ppm | None set | 4 ppm | Below the legal limit |
| Fluoridehighest measured · range 0.64 to 0.67 · sampled 2023 · 2025 report, page 4 | 0.67 ppm | 1 ppm | 4 ppm | Below the health goal |
| Lithiumaverage · 2025 report, page 4 | 57.6 ppb | 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.
EPA testing for PFAS and lithium
EPA’s own nationwide testing (UCMR 5) found these in St. John Municipal Water Utility’s water between Mar 2025 and Oct 2025. These are EPA lab results, separate from the district’s report. Anything not listed was not detected.
- Lithium83.8 ppbFound in 4 of 4 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), 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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