We read 21 results from Warrenton Pws’s 2025 water quality report. No results over a legal limit; 3 above a health goal or guideline.
Serves about 8,208 people · Water system ID MO6010834 · 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 0.95 to 1.49 · sampled 2023 · 2025 report, page 2 | 1.49 ppm | 1 ppm | 4 ppm | Above the health goal1.5x the health goal |
| Lead90th percentile of homes tested, 0 over the action level · Customer taps · 2025 report, page 2 | 1.68 ppb | 0.2 ppb | 15 ppb (action level) | Above the health goal8.4x the health goal |
| Total dissolved solidshighest measured · range 406 to 502 · sampled 2023 · 2025 report, page 3 | 502 ppm | — | 500 ppm guideline | Above the guideline1x the guideline (taste, odor or stains; not a health limit) |
| Bariumhighest measured · range 0.05 to 0.11 · sampled 2023 · 2025 report, page 2 | 0.11 ppm | 2 ppm | 2 ppm | Below the health goal |
| Chloridehighest measured · range 37.1 to 76.1 · sampled 2023 · 2025 report, page 3 | 76.1 ppm | — | 250 ppm guideline | Within the guideline |
| Copper90th percentile of homes tested, 0 over the action level · Customer taps · 2025 report, page 2 | 0.15 ppm | 0.3 ppm | 1.3 ppm (action level) | Below the health goal |
| Disinfection byproducts (HAA5)highest running annual average · range 1.99 to 1.99 · DBPDUAL-01 · 2025 report, page 2 | 2 ppb | None set | 60 ppb | Below the legal limit |
| Disinfection byproducts (TTHM)highest running annual average · range 14.8 to 14.8 · DBPDUAL-01 · 2025 report, page 2 | 15 ppb | None set | 80 ppb | Below the legal limit |
| Ironhighest measured · range 0.0066 to 0.07 · sampled 2023 · 2025 report, page 3 | 0.07 ppm | — | 0.3 ppm guideline | Within the guideline |
| Manganesehighest measured · range 0.0013 to 0.0037 · sampled 2023 · 2025 report, page 3 | 0.0037 ppm | — | 0.05 ppm guideline | Within the guideline |
| Nitrate (as N)highest measured · range ND to 0.07 · 2025 report, page 2 | 0.07 ppm | 10 ppm | 10 ppm | Below the health goal |
| pHhighest measured · range 7.63 to 8.08 · sampled 2023 · 2025 report, page 3 | 8.08 | — | — | Normal range |
| Sulfatehighest measured · range 49.8 to 74.7 · sampled 2023 · 2025 report, page 3 | 74.7 ppm | — | 250 ppm guideline | Within the guideline |
| Zinchighest measured · range 0.01 to 0.07 · sampled 2023 · 2025 report, page 3 | 0.07 ppm | — | 5 ppm guideline | Within the guideline |
| Alkalinityhighest measured · range 286 to 309 · sampled 2023 · 2025 report, page 3 | 309 ppm | None set | None | No health limit |
| Calciumhighest measured · range 51.4 to 61.2 · sampled 2023 · 2025 report, page 3 | 61.2 ppm | None set | None | No health limit |
| Hardnesshighest measured · range 13.8 to 16 · sampled 2023 · 2025 report, page 3 | 16 gpg (274 ppm) | — | — | Very hard |
| Lithiumhighest measured · range 57.4 to 77.6 · sampled 2023 · 2025 report, page 3 | 77.6 ppb | None set | None | No health limit |
| Magnesiumhighest measured · range 26 to 29.4 · sampled 2023 · 2025 report, page 3 | 29.4 ppm | None set | None | No health limit |
| Potassiumhighest measured · range 5.65 to 7.07 · sampled 2023 · 2025 report, page 3 | 7.07 ppm | None set | None | No health limit |
| Sodiumhighest measured · range 49.2 to 73.5 · sampled 2023 · 2025 report, page 3 | 73.5 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 Warrenton Pws’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.
- Lithium77.6 ppbFound in 10 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.
Fluoride
Found: Fluoride
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.
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