We read 18 results from Tarkio Board of Public Works Pws’s 2025 water quality report. No results over a legal limit or above a health goal.
Serves about 1,494 people · Water system ID MO1010786 · 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 |
|---|---|---|---|---|
| Bariumhighest measured · range 0.08 to 0.08 · sampled 2023 · Purchased water (wholesaler) · 2025 report, page 2 | 0.08 ppm | 2 ppm | 2 ppm | Below the health goal |
| Chloridehighest measured · range 21 to 21 · sampled 2023 · Purchased water (wholesaler) · 2025 report, page 3 | 21 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 | 0.03 ppm | 0.3 ppm | 1.3 ppm (action level) | Below the health goal |
| Disinfection byproducts (HAA5)highest running annual average · range 5.61 to 5.61 · DBPDUAL-01 · 2025 report, page 2 | 6 ppb | None set | 60 ppb | Below the legal limit |
| Disinfection byproducts (TTHM)highest running annual average · range 51.2 to 51.2 · DBPDUAL-01 · 2025 report, page 2 | 51 ppb | None set | 80 ppb | Below the legal limit |
| Fluoridehighest measured · range 0.13 to 0.13 · sampled 2023 · Purchased water (wholesaler) · 2025 report, page 2 | 0.13 ppm | 1 ppm | 4 ppm | Below the health goal |
| 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 |
| Nitrate (as N)highest measured · range 0.03 to 0.03 · Purchased water (wholesaler) · 2025 report, page 2 | 0.03 ppm | 10 ppm | 10 ppm | Below the health goal |
| pHhighest measured · range 8.17 to 8.17 · sampled 2023 · Purchased water (wholesaler) · 2025 report, page 3 | 8.17 | — | — | Normal range |
| Sulfatehighest measured · range 46.2 to 46.2 · sampled 2023 · Purchased water (wholesaler) · 2025 report, page 3 | 46.2 ppm | — | 250 ppm guideline | Within the guideline |
| Total dissolved solidshighest measured · range 203 to 203 · sampled 2023 · Purchased water (wholesaler) · 2025 report, page 3 | 203 ppm | — | 500 ppm guideline | Within the guideline |
| Alkalinityhighest measured · range 165 to 165 · sampled 2023 · Purchased water (wholesaler) · 2025 report, page 3 | 165 ppm | None set | None | No health limit |
| Calciumhighest measured · range 30.7 to 30.7 · sampled 2023 · Purchased water (wholesaler) · 2025 report, page 3 | 30.7 ppm | None set | None | No health limit |
| Hardnesshighest measured · range 7.72 to 7.72 · sampled 2023 · Purchased water (wholesaler) · 2025 report, page 3 | 7.72 gpg (132 ppm) | — | — | Hard |
| Magnesiumhighest measured · range 13.4 to 13.4 · sampled 2023 · Purchased water (wholesaler) · 2025 report, page 3 | 13.4 ppm | None set | None | No health limit |
| Nickelhighest measured · range 1.1 to 1.1 · printed as 0.0011 MG/L · sampled 2023 · Purchased water (wholesaler) · 2025 report, page 3 | 1.1 ppb | None set | None | No health limit |
| Potassiumhighest measured · range 3.87 to 3.87 · sampled 2023 · Purchased water (wholesaler) · 2025 report, page 3 | 3.87 ppm | None set | None | No health limit |
| Sodiumhighest measured · range 18.7 to 18.7 · sampled 2023 · Purchased water (wholesaler) · 2025 report, page 3 | 18.7 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. 2 numbers we weren’t sure about are held back until a person checks.
What you can do
Nothing in this report is above a health goal or legal limit. If you’re bothered by taste, smell, hardness or spots, or your home has older pipes, the filter catalog and buyer questions can help you pick, and a test of your own tap shows what your plumbing adds.
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