We read 9 results from Hoffman Estates’s 2025 water quality report. No results over a legal limit; 1 above a health goal or guideline.
Serves about 50,179 people · Water system ID IL0311290 · 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 |
|---|---|---|---|---|
| Arsenichighest measured · range ND to 0.54 · listed as a violation in the report · Chicago treatment plant · 2025 report, page 4 | 0.54 ppb | 0.004 ppb | 10 ppb | Above the health goal135x the health goal |
| Bariumhighest measured · range 0.02 to 0.02 · listed as a violation in the report · Chicago treatment plant · 2025 report, page 4 | 0.02 ppm | 2 ppm | 2 ppm | Below the health goal |
| Chlorineaverage · range 1 to 1.5 · listed as a violation in the report · Distribution system · 2025 report, page 3 | 1.2 ppm | None set | 4 ppm | Below the legal limit |
| Disinfection byproducts (HAA5)highest running annual average · range 11.3 to 23.7 · listed as a violation in the report · Distribution system · 2025 report, page 3 | 22 ppb | None set | 60 ppb | Below the legal limit |
| Disinfection byproducts (TTHM)highest running annual average · range 14.2 to 55 · listed as a violation in the report · Distribution system · 2025 report, page 3 | 45 ppb | None set | 80 ppb | Below the legal limit |
| Fluoridehighest measured · range 0.65 to 0.75 · listed as a violation in the report · Chicago treatment plant · 2025 report, page 4 | 0.75 ppm | 1 ppm | 4 ppm | Below the health goal |
| Nitrate (as N)highest measured · range 0.32 to 0.36 · listed as a violation in the report · Chicago treatment plant · 2025 report, page 4 | 0.36 ppm | 10 ppm | 10 ppm | Below the health goal |
| Sulfatehighest measured · range 26.8 to 27.2 · listed as a violation in the report · Chicago treatment plant · 2025 report, page 4 | 27.2 ppm | — | 250 ppm guideline | Within the guideline |
| Sodiumhighest measured · range 8.67 to 9.1 · listed as a violation in the report · Chicago treatment plant · 2025 report, page 4 | 9.1 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 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.
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