We read 12 results from Montgomery’s 2025 water quality report. No results over a legal limit; 2 above a health goal or guideline.
Serves about 28,956 people · Water system ID IL0894690 · 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 |
|---|---|---|---|---|
| Fluoridesingle sample · range 1.18 to 1.18 · listed as a violation in the report · sampled 2024 · Wells · 2025 report, page 9 | 1.18 ppm | 1 ppm | 4 ppm | Above the health goal1.2x the health goal |
| Radium (combined 226 + 228)highest measured · range 0.95 to 4.4 · listed as a violation in the report · Wells · 2025 report, page 9 | 4 pCi/L | 0 pCi/L | 5 pCi/L | Above the health goalThe health goal is zero |
| Bariumsingle sample · range 0.04 to 0.04 · listed as a violation in the report · sampled 2024 · Wells · 2025 report, page 9 | 0.04 ppm | 2 ppm | 2 ppm | Below the health goal |
| Chlorinehighest measured · range 1.5 to 1.8 · listed as a violation in the report · Distribution system · 2025 report, page 9 | 1.8 ppm | None set | 4 ppm | Below the legal limit |
| cis-1,2-Dichloroethylenehighest measured · range ND to 0.54 · listed as a violation in the report · Wells · 2025 report, page 10 | 0.54 ppb | 70 ppb | 70 ppb | Below the health goal |
| Copper90th percentile of homes tested, 1 over the action level · listed as a violation in the report · sampled 2023 · Customer taps · 2025 report, page 7 | 0.22 ppm | 0.3 ppm | 1.3 ppm (action level) | Below the health goal |
| Disinfection byproducts (HAA5)highest running annual average · range 5.4 to 6.67 · listed as a violation in the report · Distribution system · 2025 report, page 9 | 6 ppb | None set | 60 ppb | Below the legal limit |
| Disinfection byproducts (TTHM)highest running annual average · range 14.3 to 35 · listed as a violation in the report · Distribution system · 2025 report, page 9 | 25 ppb | None set | 80 ppb | Below the legal limit |
| Ironsingle sample · listed as a violation in the report · sampled 2024 · Wells · 2025 report, page 9 | 0.04 ppm | — | 0.3 ppm guideline | Within the guideline |
| Manganesesingle sample · listed as a violation in the report · printed as 3.1 ppb · sampled 2024 · Wells · 2025 report, page 9 | 0.0031 ppm | — | 0.05 ppm guideline | Within the guideline |
| Seleniumsingle sample · listed as a violation in the report · sampled 2024 · Wells · 2025 report, page 9 | 2.4 ppb | 30 ppb | 50 ppb | Below the health goal |
| Sodiumsingle sample · listed as a violation in the report · sampled 2024 · Wells · 2025 report, page 9 | 150 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 Montgomery’s water between Apr 2025 and Nov 2025. These are EPA lab results, separate from the district’s report. Anything not listed was not detected.
- Lithium32.7 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.
Fluoride
Found: Fluoride
What removes it: Reverse osmosis.
Radium and uranium
Found: Radium (combined 226 + 228)
What removes it: Reverse osmosis.
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