We read 7 results from Jefferson County Pwsd 5’s 2025 water quality report. No results over a legal limit; 3 above a health goal or guideline.
Serves about 8,000 people · Water system ID MO6024296 · 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 |
|---|---|---|---|---|
| Copper90th percentile of homes tested, 1 over the action level · sampled 2024 · Customer taps · 2025 report, page 2 | 0.69 ppm | 0.3 ppm | 1.3 ppm (action level) | Above the health goal2.3x the health goal |
| Gross alpha (radioactivity)highest measured · range 3.1 to 3.1 · sampled 2024 · 2025 report, page 2 | 3.1 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 | 1.13 ppb | 0.2 ppb | 15 ppb (action level) | Above the health goal5.6x the health goal |
| Bariumhighest measured · range 0.08 to 0.13 · 2025 report, page 2 | 0.13 ppm | 2 ppm | 2 ppm | Below the health goal |
| Disinfection byproducts (TTHM)highest running annual average · range 1.64 to 1.64 · DBPDUAL-01 · 2025 report, page 2 | 2 ppb | None set | 80 ppb | Below the legal limit |
| Fluoridehighest measured · range 0.77 to 0.96 · 2025 report, page 2 | 0.96 ppm | 1 ppm | 4 ppm | Below the health goal |
| Nitrate (as N)highest measured · range ND to 0.04 · 2025 report, page 2 | 0.04 ppm | 10 ppm | 10 ppm | Below the health goal |
Utility results describe the whole system, measured where water enters the pipes, not your tap. Your home’s plumbing can add lead or copper. 16 numbers we weren’t sure about are held back until a person checks.
EPA testing for PFAS and lithium
EPA’s own nationwide testing (UCMR 5) found these in Jefferson County Pwsd 5’s water between Feb 2024 and Aug 2024. These are EPA lab results, separate from the district’s report. Anything not listed was not detected.
- Lithium27 ppbFound in 2 of 10 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.
Lead
Found: Copper, Lead
What removes it: Reverse osmosis or Certified carbon block or RO.
Radium and uranium
Found: Gross alpha (radioactivity)
What removes it: Reverse osmosis.
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