We read 16 results from Yorkville’s 2025 water quality report. No results over a legal limit; 4 above a health goal or guideline.
Serves about 23,000 people · Water system ID IL0930250 · 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 0.09 to 0.21 · Wells · 2025 report, page 3 | 0.21 ppb | 0.004 ppb | 10 ppb | Above the health goal53x the health goal |
| Gross alpha (radioactivity)highest measured · Wells · 2025 report, page 3 | 12 pCi/L | 0 pCi/L | 15 pCi/L | Above the health goalThe health goal is zero |
| Lead90th percentile of homes tested, 0 over the action level · sampled 2023 · Customer taps · 2025 report, page 2 | 1.2 ppb | 0.2 ppb | 15 ppb (action level) | Above the health goal6x the health goal |
| Radium (combined 226 + 228)highest measured · range 2.57 to 4.38 · Wells · 2025 report, page 3 | 4 pCi/L | 0 pCi/L | 5 pCi/L | Above the health goalThe health goal is zero |
| Bariumhighest measured · range 0.02 to 0.07 · Wells · 2025 report, page 3 | 0.07 ppm | 2 ppm | 2 ppm | Below the health goal |
| Chlorineas reported · range 1 to 1 · Distribution system · 2025 report, page 3 | 1 ppm | None set | 4 ppm | Below the legal limit |
| Chromium (total)highest measured · range 0.94 to 2.28 · Wells · 2025 report, page 3 | 2.28 ppb | None set | 100 ppb | Below the legal limit |
| Copper90th percentile of homes tested, 0 over the action level · sampled 2023 · Customer taps · 2025 report, page 2 | 0.26 ppm | 0.3 ppm | 1.3 ppm (action level) | Below the health goal |
| Disinfection byproducts (HAA5)highest measured · range 0.94 to 2.4 · Distribution system · 2025 report, page 3 | 2 ppb | None set | 60 ppb | Below the legal limit |
| Disinfection byproducts (TTHM)highest measured · range 4.7 to 18 · Distribution system · 2025 report, page 3 | 18 ppb | None set | 80 ppb | Below the legal limit |
| Fluoridehighest measured · range 0.7 to 0.8 · Wells · 2025 report, page 3 | 0.8 ppm | 1 ppm | 4 ppm | Below the health goal |
| Ironhighest measured · range 0.04 to 0.07 · Wells · 2025 report, page 3 | 0.07 ppm | — | 0.3 ppm guideline | Within the guideline |
| Manganesehighest measured · range ND to 0.0032 · printed as 3.23 ppb · Wells · 2025 report, page 3 | 0.0032 ppm | — | 0.05 ppm guideline | Within the guideline |
| Seleniumhighest measured · range 0.27 to 0.73 · Wells · 2025 report, page 3 | 0.73 ppb | 30 ppb | 50 ppb | Below the health goal |
| Zinchighest measured · range ND to 0.0046 · Wells · 2025 report, page 3 | 0.0046 ppm | — | 5 ppm guideline | Within the guideline |
| Sodiumhighest measured · range 23 to 121 · Wells · 2025 report, page 3 | 121 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.
EPA testing for PFAS and lithium
EPA’s own nationwide testing (UCMR 5) found these in Yorkville’s water between Nov 2024 and May 2025. These are EPA lab results, separate from the district’s report. Anything not listed was not detected.
- Lithium49.5 ppbFound in 6 of 6 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 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)
What removes it: Reverse osmosis.
Lead
Found: Lead
What removes it: Certified carbon block or RO.
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