We read 24 results from Boone County Pwsd 4’s 2025 water quality report. No results over a legal limit; 7 above a health goal or guideline.
Serves about 6,455 people · Water system ID MO3024052 · Read the district’s 2025 report (opens in a new tab)
Open this district in the water lookupCompare with your own test results, see the district map and get matched filters.
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 |
|---|---|---|---|---|
| Fluoridehighest measured · range 0.67 to 1.5 · sampled 2024 · 2025 report, page 2 | 1.5 ppm | 1 ppm | 4 ppm | Above the health goal1.5x the health goal |
| Gross alpha (radioactivity)highest measured · range 9.8 to 9.8 · highest of 2 sources · 2025 report, page 2 | 9.8 pCi/L | 0 pCi/L | 15 pCi/L | Above the health goalThe health goal is zero |
| Lead90th percentile of homes tested, 2 over the action level · Customer taps · 2025 report, page 2 | 9.27 ppb | 0.2 ppb | 15 ppb (action level) | Above the health goal46x the health goal |
| Radium (combined 226 + 228)highest measured · range 3 to 3 · 2025 report, page 2 | 3 pCi/L | 0 pCi/L | 5 pCi/L | Above the health goalThe health goal is zero |
| Radium-226highest measured · range 3 to 3 · 2025 report, page 2 | 3 pCi/L | 0.05 pCi/L | 5 pCi/L | Above the health goal60x the health goal |
| Total dissolved solidshighest measured · range 361 to 596 · sampled 2024 · 2025 report, page 3 | 596 ppm | — | 500 ppm guideline | Above the guideline1.2x the guideline (taste, odor or stains; not a health limit) |
| Uraniumhighest measured · range ND to 0.75 · sampled 2022 · 2025 report, page 2 | 0.75 ppb | 0.6 ppb | 30 ppb | Above the health goal1.3x the health goal |
| Bariumhighest measured · range 0.03 to 0.07 · sampled 2024 · 2025 report, page 2 | 0.07 ppm | 2 ppm | 2 ppm | Below the health goal |
| Chloridehighest measured · range 16.2 to 62.2 · sampled 2024 · 2025 report, page 3 | 62.2 ppm | — | 250 ppm guideline | Within the guideline |
| Copper90th percentile of homes tested, 0 over the action level · Customer taps · 2025 report, page 2 | 0.13 ppm | 0.3 ppm | 1.3 ppm (action level) | Below the health goal |
| Ironhighest measured · range 0.0092 to 0.1 · sampled 2024 · 2025 report, page 3 | 0.1 ppm | — | 0.3 ppm guideline | Within the guideline |
| Manganesehighest measured · range 0.002 to 0.0046 · sampled 2024 · 2025 report, page 3 | 0.0046 ppm | — | 0.05 ppm guideline | Within the guideline |
| Nitrate (as N)highest measured · range ND to 0.03 · 2025 report, page 2 | 0.03 ppm | 10 ppm | 10 ppm | Below the health goal |
| pHhighest measured · range 7.56 to 8.05 · sampled 2024 · 2025 report, page 3 | 8.05 | — | — | Normal range |
| Sulfatehighest measured · range 34.6 to 124 · sampled 2024 · 2025 report, page 3 | 124 ppm | — | 250 ppm guideline | Within the guideline |
| Zinchighest measured · range 0.004 to 0.07 · sampled 2024 · 2025 report, page 3 | 0.07 ppm | — | 5 ppm guideline | Within the guideline |
| Alkalinityhighest measured · range 321 to 409 · sampled 2024 · 2025 report, page 3 | 409 ppm | None set | None | No health limit |
| Calciumhighest measured · range 69 to 101 · sampled 2024 · 2025 report, page 3 | 101 ppm | None set | None | No health limit |
| Hardnesshighest measured · range 18.4 to 24.6 · sampled 2024 · 2025 report, page 3 | 24.6 gpg (421 ppm) | — | — | Very hard |
| Lithiumhighest measured · range 28 to 110 · sampled 2024 · highest of 2 sources · 2025 report, page 3 | 110 ppb | None set | None | No health limit |
| Magnesiumhighest measured · range 32.4 to 41 · sampled 2024 · 2025 report, page 3 | 41 ppm | None set | None | No health limit |
| Nickelhighest measured · range 2.25 to 3.79 · printed as 0.00379 MG/L · sampled 2024 · 2025 report, page 3 | 3.79 ppb | None set | None | No health limit |
| Potassiumhighest measured · range 4.1 to 12.3 · sampled 2024 · 2025 report, page 3 | 12.3 ppm | None set | None | No health limit |
| Sodiumhighest measured · range 35.4 to 74.2 · sampled 2024 · 2025 report, page 3 | 74.2 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 Boone County Pwsd 4’s water between Jan 2024 and Jul 2024. These are EPA lab results, separate from the district’s report. Anything not listed was not detected.
- Lithium110 ppbFound in 12 of 12 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.
Fluoride
Found: Fluoride
What removes it: Reverse osmosis.
Radium and uranium
Found: Gross alpha (radioactivity), Radium (combined 226 + 228), Radium-226, Uranium
What removes it: Reverse osmosis.
Lead
Found: Lead
What removes it: Certified carbon block or RO.
Salty taste / high TDS
Found: Total dissolved solids
What removes it: Reverse osmosis.
More districts: Missouri water quality · All states · Something look wrong? Tell us