We read 18 results from Romeoville’s 2024 water quality report. No results over a legal limit; 5 above a health goal or guideline.
Serves about 50,458 people · Water system ID IL1970900 · Read the district’s 2024 report (opens in a new tab)
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Results from the 2024 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 0.36 to 0.49 · listed as a violation in the report · sampled 2023 · Wells · 2024 report, page 7 | 0.49 ppb | 0.004 ppb | 10 ppb | Above the health goal122x the health goal |
| Fluoridehighest measured · range 0.61 to 1.24 · listed as a violation in the report · sampled 2023 · Wells · 2024 report, page 7 | 1.24 ppm | 1 ppm | 4 ppm | Above the health goal1.2x the health goal |
| Gross alpha (radioactivity)highest measured · range 0.4 to 3.2 · listed as a violation in the report · Wells · 2024 report, page 7 | 3 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 · listed as a violation in the report · Customer taps · 2024 report, page 5 | 1.44 ppb | 0.2 ppb | 15 ppb (action level) | Above the health goal7.2x the health goal |
| Radium (combined 226 + 228)highest measured · range 1.1 to 3.3 · listed as a violation in the report · Wells · 2024 report, page 7 | 3 pCi/L | 0 pCi/L | 5 pCi/L | Above the health goalThe health goal is zero |
| Bariumhighest measured · range 0.0036 to 0.17 · listed as a violation in the report · sampled 2023 · Wells · 2024 report, page 7 | 0.17 ppm | 2 ppm | 2 ppm | Below the health goal |
| Chromium (total)highest measured · range 4.38 to 5.42 · listed as a violation in the report · sampled 2023 · Wells · 2024 report, page 7 | 5.42 ppb | None set | 100 ppb | Below the legal limit |
| Copper90th percentile of homes tested, 0 over the action level · listed as a violation in the report · Customer taps · 2024 report, page 5 | 0.14 ppm | 0.3 ppm | 1.3 ppm (action level) | Below the health goal |
| DEHP (a phthalate)highest measured · range ND to 1.91 · listed as a violation in the report · Wells · 2024 report, page 6 | 1.91 ppb | 12 ppb | 6 ppb | Below the health goal |
| Disinfection byproducts (TTHM)highest measured · range 20.7 to 48 · listed as a violation in the report · Distribution system · 2024 report, page 6 | 48 ppb | None set | 80 ppb | Below the legal limit |
| Manganesehighest measured · range ND to 0.0061 · listed as a violation in the report · printed as 6.07 ppb · sampled 2023 · Wells · 2024 report, page 8 | 0.0061 ppm | — | 0.05 ppm guideline | Within the guideline |
| Mercuryhighest measured · range ND to 0.1 · listed as a violation in the report · sampled 2023 · Wells · 2024 report, page 7 | 0.1 ppb | 1.2 ppb | 2 ppb | Below the health goal |
| Nitrate (as N)highest measured · range ND to 0.54 · listed as a violation in the report · Wells · 2024 report, page 7 | 0.54 ppm | 10 ppm | 10 ppm | Below the health goal |
| Seleniumhighest measured · range 0.86 to 1.33 · listed as a violation in the report · sampled 2023 · Wells · 2024 report, page 7 | 1.33 ppb | 30 ppb | 50 ppb | Below the health goal |
| Lithiumhighest measured · range 18.1 to 54.6 · Wells · 2024 report, page 9 | 54.6 ppb | None set | None | No health limit |
| PFHxA (a PFAS)highest measured · range 3 to 11.8 · printed as .0118 ppb · Wells · 2024 report, page 9 | 11.8 ppt | None set | None | No health limit |
| PFPeA (a PFAS)highest measured · range 5 to 21.2 · printed as .0212 ppb · Wells · 2024 report, page 9 | 21.2 ppt | None set | None | No health limit |
| Sodiumhighest measured · range 134 to 164 · listed as a violation in the report · sampled 2023 · Wells · 2024 report, page 8 | 164 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.
EPA testing for PFAS and lithium
EPA’s own nationwide testing (UCMR 5) found these in Romeoville’s water between Jun 2024 and Jun 2025. These are EPA lab results, separate from the district’s report. Anything not listed was not detected.
- Lithium54.6 ppbFound in 15 of 15 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.
Fluoride
Found: Fluoride
What removes it: Reverse osmosis.
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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