We read 22 results from Johnson County Pwsd 3’s 2025 water quality report. No results over a legal limit; 3 above a health goal or guideline.
Serves about 4,700 people · Water system ID MO1024311 · 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 4.2 · 2025 report, page 2 | 4.2 pCi/L | 0 pCi/L | 15 pCi/L | Above the health goalThe health goal is zero |
| Radium (combined 226 + 228)highest measured · range 1.6 to 2 · 2025 report, page 2 | 2 pCi/L | 0 pCi/L | 5 pCi/L | Above the health goalThe health goal is zero |
| Radium-226highest measured · range 1.6 to 2 · 2025 report, page 2 | 2 pCi/L | 0.05 pCi/L | 5 pCi/L | Above the health goal40x the health goal |
| Bariumhighest measured · range 0.07 to 0.12 · sampled 2023 · 2025 report, page 2 | 0.12 ppm | 2 ppm | 2 ppm | Below the health goal |
| Chloridehighest measured · range 45 to 45.8 · sampled 2023 · 2025 report, page 3 | 45.8 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 | 0.16 ppm | 0.3 ppm | 1.3 ppm (action level) | Below the health goal |
| Fluoridehighest measured · range 0.59 to 0.63 · sampled 2023 · 2025 report, page 2 | 0.63 ppm | 1 ppm | 4 ppm | Below the health goal |
| Ironhighest measured · range 0.02 to 0.02 · sampled 2023 · 2025 report, page 3 | 0.02 ppm | — | 0.3 ppm guideline | Within the guideline |
| Lead90th percentile of homes tested, 0 over the action level · sampled 2024 · Customer taps · 2025 report, page 2 | Not detected | 0.2 ppb | 15 ppb (action level) | Not detected |
| Manganesehighest measured · range 0.0014 to 0.0021 · sampled 2023 · 2025 report, page 3 | 0.0021 ppm | — | 0.05 ppm guideline | Within the guideline |
| Nitrate (as N)highest measured · range ND to 0.01 · 2025 report, page 2 | 0.01 ppm | 10 ppm | 10 ppm | Below the health goal |
| pHhighest measured · range 7.45 to 7.6 · sampled 2023 · 2025 report, page 3 | 7.6 | — | — | Normal range |
| Sulfatehighest measured · range 27.3 to 36.4 · sampled 2023 · 2025 report, page 3 | 36.4 ppm | — | 250 ppm guideline | Within the guideline |
| Total dissolved solidshighest measured · range 320 to 322 · sampled 2023 · 2025 report, page 3 | 322 ppm | — | 500 ppm guideline | Within the guideline |
| Zinchighest measured · range 0.0099 to 0.02 · sampled 2023 · 2025 report, page 3 | 0.02 ppm | — | 5 ppm guideline | Within the guideline |
| Alkalinityhighest measured · range 254 to 269 · sampled 2023 · 2025 report, page 3 | 269 ppm | None set | None | No health limit |
| Calciumhighest measured · range 48.3 to 53.6 · sampled 2023 · 2025 report, page 3 | 53.6 ppm | None set | None | No health limit |
| Hardnesshighest measured · range 12.5 to 13.7 · sampled 2023 · 2025 report, page 3 | 13.7 gpg (235 ppm) | — | — | Very hard |
| Lithiumhighest measured · range 23.9 to 25 · sampled 2024 · highest of 2 sources · 2025 report, page 3 | 25 ppb | None set | None | No health limit |
| Magnesiumhighest measured · range 22.5 to 24.7 · sampled 2023 · 2025 report, page 3 | 24.7 ppm | None set | None | No health limit |
| Potassiumhighest measured · range 3.57 to 4.11 · sampled 2023 · 2025 report, page 3 | 4.11 ppm | None set | None | No health limit |
| Sodiumhighest measured · range 38.7 to 39.7 · sampled 2023 · 2025 report, page 3 | 39.7 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.
EPA testing for PFAS and lithium
EPA’s own nationwide testing (UCMR 5) found these in Johnson County Pwsd 3’s water between May 2024 and Nov 2024. These are EPA lab results, separate from the district’s report. Anything not listed was not detected.
- Lithium25 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
What removes it: Reverse osmosis.
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