We read 8 results from Mattoon’s 2025 water quality report. No results over a legal limit or above a health goal.
Serves about 19,500 people · Water system ID IL0290250 · 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 0.01 to 0.01 · 2025 report, page 3 | 0.01 ppm | 2 ppm | 2 ppm | Below the health goal |
| Chloraminehighest running annual average · range 2 to 3 · 2025 report, page 3 | 2.5 ppm | None set | 4 ppm | Below the legal limit |
| Copper90th percentile of homes tested, 0 over the action level · Customer taps · 2025 report, page 3 | 0.06 ppm | 0.3 ppm | 1.3 ppm (action level) | Below the health goal |
| Disinfection byproducts (HAA5)highest running annual average · range 6.29 to 39.1 · 2025 report, page 3 | 25 ppb | None set | 60 ppb | Below the legal limit |
| Disinfection byproducts (TTHM)highest running annual average · range 2.65 to 55.8 · 2025 report, page 3 | 34 ppb | None set | 80 ppb | Below the legal limit |
| Fluorideas reported · range 0.57 to 0.57 · 2025 report, page 3 | 0.6 ppm | 1 ppm | 4 ppm | Below the health goal |
| Nitrate (as N)as reported · range ND to 6.4 · 2025 report, page 3 | 6 ppm | 10 ppm | 10 ppm | Below the health goal |
| Sodiumhighest measured · range 12 to 12 · 2025 report, page 4 | 12 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. 1 number we weren’t sure about is 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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