We read 21 results from Terre Du Lac’s 2025 water quality report. No results over a legal limit; 6 above a health goal or guideline.
Serves about 3,200 people · Water system ID MO4036059 · 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 |
|---|---|---|---|---|
| Cadmiumhighest measured · range ND to 0.29 · sampled 2024 · 2025 report, page 2 | 0.29 ppb | 0.04 ppb | 5 ppb | Above the health goal7.2x the health goal |
| Gross alpha (radioactivity)highest measured · range 3.3 to 5.7 · sampled 2022 · 2025 report, page 2 | 5.7 pCi/L | 0 pCi/L | 15 pCi/L | Above the health goalThe health goal is zero |
| Ironhighest measured · range 0.05 to 0.41 · sampled 2024 · 2025 report, page 3 | 0.41 ppm | — | 0.3 ppm guideline | Above the guideline1.4x the guideline (taste, odor or stains; not a health limit) |
| Lead90th percentile of homes tested, 0 over the action level · Customer taps · 2025 report, page 2 | 3.9 ppb | 0.2 ppb | 15 ppb (action level) | Above the health goal20x the health goal |
| Radium (combined 226 + 228)highest measured · range 1.6 to 2 · sampled 2022 · 2025 report, page 2 | 2 pCi/L | 0 pCi/L | 5 pCi/L | Above the health goalThe health goal is zero |
| Radium-226highest measured · range 1.6 to 2 · sampled 2022 · 2025 report, page 2 | 2 pCi/L | 0.05 pCi/L | 5 pCi/L | Above the health goal40x the health goal |
| Bariumhighest measured · range 0.06 to 0.1 · sampled 2024 · 2025 report, page 2 | 0.1 ppm | 2 ppm | 2 ppm | Below the health goal |
| Copper90th percentile of homes tested, 0 over the action level · Customer taps · 2025 report, page 2 | 0.09 ppm | 0.3 ppm | 1.3 ppm (action level) | Below the health goal |
| Fluoridehighest measured · range ND to 0.12 · sampled 2024 · 2025 report, page 2 | 0.12 ppm | 1 ppm | 4 ppm | Below the health goal |
| Manganesehighest measured · range 0.0013 to 0.0036 · sampled 2024 · 2025 report, page 3 | 0.0036 ppm | — | 0.05 ppm guideline | Within the guideline |
| pHhighest measured · range 8.05 to 8.16 · sampled 2024 · 2025 report, page 3 | 8.16 | — | — | Normal range |
| Sulfatehighest measured · range 31.4 to 35.7 · sampled 2024 · 2025 report, page 3 | 35.7 ppm | — | 250 ppm guideline | Within the guideline |
| Total dissolved solidshighest measured · range 307 to 318 · sampled 2024 · 2025 report, page 3 | 318 ppm | — | 500 ppm guideline | Within the guideline |
| Zinchighest measured · range 0.01 to 0.32 · sampled 2024 · 2025 report, page 3 | 0.32 ppm | — | 5 ppm guideline | Within the guideline |
| Alkalinityhighest measured · range 362 to 393 · sampled 2024 · 2025 report, page 3 | 393 ppm | None set | None | No health limit |
| Calciumhighest measured · range 57.5 to 59.4 · sampled 2024 · 2025 report, page 3 | 59.4 ppm | None set | None | No health limit |
| Hardnesshighest measured · range 17.3 to 18 · sampled 2024 · 2025 report, page 3 | 18 gpg (308 ppm) | — | — | Very hard |
| Magnesiumhighest measured · range 35.9 to 40 · sampled 2024 · 2025 report, page 3 | 40 ppm | None set | None | No health limit |
| Nickelhighest measured · range 1.85 to 2.86 · printed as 0.00286 MG/L · sampled 2024 · 2025 report, page 3 | 2.86 ppb | None set | None | No health limit |
| Potassiumhighest measured · range 1.3 to 1.79 · sampled 2024 · 2025 report, page 3 | 1.79 ppm | None set | None | No health limit |
| Sodiumhighest measured · range 5.71 to 5.9 · sampled 2024 · 2025 report, page 3 | 5.9 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.
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.
Radium and uranium
Found: Gross alpha (radioactivity), Radium (combined 226 + 228), Radium-226
What removes it: Reverse osmosis.
Lead
Found: Lead
What removes it: Certified carbon block or RO.
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