We read 21 results from Marshall Pws’s 2025 water quality report. No results over a legal limit; 1 above a health goal or guideline.
Serves about 12,934 people · Water system ID MO2010502 · 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 |
|---|---|---|---|---|
| Lead90th percentile of homes tested, 0 over the action level · Customer taps · 2025 report, page 2 | 3.76 ppb | 0.2 ppb | 15 ppb (action level) | Above the health goal19x the health goal |
| Aluminumhighest measured · range 0.12 to 0.12 · sampled 2023 · 2025 report, page 3 | 0.12 ppm | — | 0.2 ppm guideline | Within the guideline |
| Bariumhighest measured · range 0.04 to 0.04 · sampled 2023 · 2025 report, page 2 | 0.04 ppm | 2 ppm | 2 ppm | Below the health goal |
| Chloridehighest measured · range 68.9 to 68.9 · sampled 2023 · 2025 report, page 3 | 68.9 ppm | — | 250 ppm guideline | Within the guideline |
| Copper90th percentile of homes tested, 0 over the action level · Customer taps · 2025 report, page 2 | 0.04 ppm | 0.3 ppm | 1.3 ppm (action level) | Below the health goal |
| Disinfection byproducts (HAA5)highest running annual average · range 7.96 to 13.9 · DBPDUAL-02, highest of 4 sources · 2025 report, page 2 | 11 ppb | None set | 60 ppb | Below the legal limit |
| Disinfection byproducts (TTHM)highest running annual average · range 24.9 to 32.6 · DBPDUAL-02, highest of 4 sources · 2025 report, page 2 | 31 ppb | None set | 80 ppb | Below the legal limit |
| Fluoridehighest measured · range 0.27 to 0.27 · sampled 2023 · 2025 report, page 2 | 0.27 ppm | 1 ppm | 4 ppm | Below the health goal |
| Ironhighest measured · range 0.01 to 0.01 · sampled 2023 · 2025 report, page 3 | 0.01 ppm | — | 0.3 ppm guideline | Within the guideline |
| Nitrate (as N)highest measured · range 0.14 to 0.14 · 2025 report, page 2 | 0.14 ppm | 10 ppm | 10 ppm | Below the health goal |
| pHhighest measured · range 8.47 to 8.47 · sampled 2023 · 2025 report, page 3 | 8.47 | — | — | Normal range |
| Sulfatehighest measured · range 8.16 to 8.16 · sampled 2023 · 2025 report, page 3 | 8.16 ppm | — | 250 ppm guideline | Within the guideline |
| Total dissolved solidshighest measured · range 260 to 260 · sampled 2023 · 2025 report, page 3 | 260 ppm | — | 500 ppm guideline | Within the guideline |
| Zinchighest measured · range 0.0016 to 0.0016 · sampled 2023 · 2025 report, page 3 | 0.0016 ppm | — | 5 ppm guideline | Within the guideline |
| Alkalinityhighest measured · range 109 to 109 · sampled 2023 · 2025 report, page 3 | 109 ppm | None set | None | No health limit |
| Calciumhighest measured · range 19.2 to 19.2 · sampled 2023 · 2025 report, page 3 | 19.2 ppm | None set | None | No health limit |
| Hardnesshighest measured · range 7.37 to 7.37 · sampled 2023 · 2025 report, page 3 | 7.37 gpg (126 ppm) | — | — | Hard |
| Lithiumhighest measured · range 10.6 to 13.8 · sampled 2024 · highest of 2 sources · 2025 report, page 3 | 13.8 ppb | None set | None | No health limit |
| Magnesiumhighest measured · range 18.9 to 18.9 · sampled 2023 · 2025 report, page 3 | 18.9 ppm | None set | None | No health limit |
| Potassiumhighest measured · range 3.06 to 3.06 · sampled 2023 · 2025 report, page 3 | 3.06 ppm | None set | None | No health limit |
| Sodiumhighest measured · range 43.4 to 43.4 · sampled 2023 · 2025 report, page 3 | 43.4 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 Marshall Pws’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.
- Lithium13.8 ppbFound in 2 of 2 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: Lead
What removes it: Certified carbon block or RO.
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