We read 21 results from Callaway County Pwsd 1’s 2025 water quality report. No results over a legal limit; 2 above a health goal or guideline.
Serves about 9,840 people · Water system ID MO3024084 · 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 |
|---|---|---|---|---|
| Fluoridehighest measured · range 0.57 to 1.02 · sampled 2024 · 2025 report, page 2 | 1.02 ppm | 1 ppm | 4 ppm | Above the health goal1x the health goal |
| Lead90th percentile of homes tested, 2 over the action level · sampled 2024 · Customer taps · 2025 report, page 2 | 4.06 ppb | 0.2 ppb | 15 ppb (action level) | Above the health goal20x the health goal |
| Bariumhighest measured · range 0.01 to 0.1 · sampled 2024 · 2025 report, page 2 | 0.1 ppm | 2 ppm | 2 ppm | Below the health goal |
| Chloridehighest measured · range ND to 12.9 · sampled 2024 · 2025 report, page 3 | 12.9 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 | 0.19 ppm | 0.3 ppm | 1.3 ppm (action level) | Below the health goal |
| Disinfection byproducts (TTHM)highest running annual average · range 0.66 to 0.66 · DBPDUAL-01 · 2025 report, page 2 | 1 ppb | None set | 80 ppb | Below the legal limit |
| Ironhighest measured · range ND to 0.24 · sampled 2024 · 2025 report, page 3 | 0.24 ppm | — | 0.3 ppm guideline | Within the guideline |
| Manganesehighest measured · range 0.0019 to 0.0055 · sampled 2024 · 2025 report, page 3 | 0.0055 ppm | — | 0.05 ppm guideline | Within the guideline |
| Nitrate (as N)highest measured · range ND to 0.02 · 2025 report, page 2 | 0.02 ppm | 10 ppm | 10 ppm | Below the health goal |
| pHhighest measured · range 7.38 to 7.84 · sampled 2024 · 2025 report, page 3 | 7.84 | — | — | Normal range |
| Sulfatehighest measured · range 25.1 to 29.3 · sampled 2024 · 2025 report, page 3 | 29.3 ppm | — | 250 ppm guideline | Within the guideline |
| Total dissolved solidshighest measured · range 273 to 387 · sampled 2024 · 2025 report, page 3 | 387 ppm | — | 500 ppm guideline | Within the guideline |
| Zinchighest measured · range 0.0029 to 0.33 · sampled 2024 · 2025 report, page 3 | 0.33 ppm | — | 5 ppm guideline | Within the guideline |
| Alkalinityhighest measured · range 264 to 346 · sampled 2024 · 2025 report, page 3 | 346 ppm | None set | None | No health limit |
| Calciumhighest measured · range 58.2 to 72.8 · sampled 2024 · 2025 report, page 3 | 72.8 ppm | None set | None | No health limit |
| Hardnesshighest measured · range 14.3 to 18.3 · sampled 2024 · 2025 report, page 3 | 18.3 gpg (312 ppm) | — | — | Very hard |
| Lithiumhighest measured · range 15.6 to 40.1 · sampled 2023 · 2025 report, page 3 | 40.1 ppb | None set | None | No health limit |
| Magnesiumhighest measured · range 24.2 to 31.7 · sampled 2024 · 2025 report, page 3 | 31.7 ppm | None set | None | No health limit |
| Nickelhighest measured · range 1.75 to 3.4 · printed as 0.0034 MG/L · sampled 2024 · 2025 report, page 3 | 3.4 ppb | None set | None | No health limit |
| Potassiumhighest measured · range 2.93 to 6.35 · sampled 2024 · 2025 report, page 3 | 6.35 ppm | None set | None | No health limit |
| Sodiumhighest measured · range 12.4 to 31.2 · sampled 2024 · 2025 report, page 3 | 31.2 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. 4 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 Callaway County Pwsd 1’s water between Mar 2023 and Sep 2023. These are EPA lab results, separate from the district’s report. Anything not listed was not detected.
- Lithium40.1 ppbFound in 14 of 14 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.
Lead
Found: Lead
What removes it: Certified carbon block or RO.
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