We read 11 results from West Chicago’s 2025 water quality report. No results over a legal limit or above a health goal.
Serves about 25,166 people · Water system ID IL0430900 · 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 · sampled 2024 · Treated water · 2025 report, page 4 | 0.04 ppm | 2 ppm | 2 ppm | Below the health goal |
| Chlorineas reported · range 1 to 1.2 · Distribution system · 2025 report, page 4 | 1 ppm | None set | 4 ppm | Below the legal limit |
| Chromium (total)highest measured · sampled 2024 · Treated water · 2025 report, page 4 | 3.04 ppb | None set | 100 ppb | Below the legal limit |
| Copper90th percentile of homes tested, 0 over the action level · printed as 103 ppb · Customer taps · 2025 report, page 3 | 0.1 ppm | 0.3 ppm | 1.3 ppm (action level) | Below the health goal |
| Cyanidehighest measured · sampled 2024 · Treated water · 2025 report, page 4 | 3 ppb | 150 ppb | 200 ppb | Below the health goal |
| Disinfection byproducts (HAA5)highest measured · range 4.2 to 6.6 · Distribution system · 2025 report, page 4 | 6.6 ppb | None set | 60 ppb | Below the legal limit |
| Disinfection byproducts (TTHM)highest measured · range 22.4 to 45 · Distribution system · 2025 report, page 4 | 45 ppb | None set | 80 ppb | Below the legal limit |
| Fluoridehighest measured · sampled 2024 · Treated water · 2025 report, page 4 | 0.51 ppm | 1 ppm | 4 ppm | Below the health goal |
| Ironhighest measured · range ND to 0.07 · Treated water · 2025 report, page 4 | 0.07 ppm | — | 0.3 ppm guideline | Within the guideline |
| Seleniumhighest measured · sampled 2024 · Treated water · 2025 report, page 4 | 0.24 ppb | 30 ppb | 50 ppb | Below the health goal |
| Sodiumhighest measured · sampled 2024 · Treated water · 2025 report, page 4 | 36.4 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. 1 number we weren’t sure about is held back until a person checks.
EPA testing for PFAS and lithium
EPA’s own nationwide testing (UCMR 5) found these in West Chicago’s water between May 2024 and Oct 2024. These are EPA lab results, separate from the district’s report. Anything not listed was not detected.
- Lithium36.8 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 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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