We read 15 results from Buffalo Grove’s 2025 water quality report. No results over a legal limit; 4 above a health goal or guideline.
Serves about 43,212 people · Water system ID IL0314180 · 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 |
|---|---|---|---|---|
| Fluoridehighest measured · range 0.83 to 1.08 · listed as a violation in the report · sampled 2024 · Backup wells, highest of 2 sources · 2025 report, page 9 | 1.08 ppm | 1 ppm | 4 ppm | Above the health goal1.1x the health goal |
| Ironhighest measured · range 0.36 to 0.51 · listed as a violation in the report · sampled 2024 · Backup wells · 2025 report, page 9 | 0.51 ppm | — | 0.3 ppm guideline | Above the guideline1.7x the guideline (taste, odor or stains; not a health limit) |
| PFOA (a PFAS)highest measured · range 1.8 to 2.3 · Evanston water · 2025 report, page 15 | 2.3 ppt | 0.007 ppt | 4 ppt from 2029 | Above the health goal329x the health goal |
| PFOS (a PFAS)highest measured · range 1.8 to 2 · Evanston water · 2025 report, page 14 | 2 ppt | 1 ppt | 4 ppt from 2029 | Above the health goal2x the health goal |
| Bariumhighest measured · range 0.03 to 0.06 · listed as a violation in the report · sampled 2024 · Backup wells, highest of 2 sources · 2025 report, page 8 | 0.06 ppm | 2 ppm | 2 ppm | Below the health goal |
| Chlorineaverage · range 0.8 to 1 · listed as a violation in the report · Distribution system · 2025 report, page 8 | 0.9 ppm | None set | 4 ppm | Below the legal limit |
| Copper90th percentile of homes tested · listed as a violation in the report · sampled 2023 · Customer taps · 2025 report, page 6 | 0.09 ppm | 0.3 ppm | 1.3 ppm (action level) | Below the health goal |
| Disinfection byproducts (HAA5)highest running annual average · range 12 to 23.6 · listed as a violation in the report · Distribution system · 2025 report, page 8 | 22 ppb | None set | 60 ppb | Below the legal limit |
| Disinfection byproducts (TTHM)highest running annual average · range 20.9 to 51.2 · listed as a violation in the report · Distribution system · 2025 report, page 8 | 50 ppb | None set | 80 ppb | Below the legal limit |
| Lead90th percentile of homes tested · listed as a violation in the report · sampled 2023 · Customer taps · 2025 report, page 6 | Not detected | 0.2 ppb | 15 ppb (action level) | Not detected |
| Manganesehighest measured · range 0.0078 to 0.009 · listed as a violation in the report · printed as 9 ppb · sampled 2024 · Backup wells · 2025 report, page 9 | 0.009 ppm | — | 0.05 ppm guideline | Within the guideline |
| Nitrate (as N)single sample · listed as a violation in the report · Evanston water · 2025 report, page 12 | 0.3 ppm | 10 ppm | 10 ppm | Below the health goal |
| PFHxS (a PFAS)highest measured · range 0.6 to 0.8 · Evanston water · 2025 report, page 16 | 0.8 ppt | None set | 10 ppt from 2029 | Below the legal limit |
| PFHpA (a PFAS)highest measured · range 0.9 to 1.1 · Evanston water · 2025 report, page 16 | 1.1 ppt | None set | None | No health limit |
| PFHxA (a PFAS)highest measured · range 1.2 to 1.3 · Evanston water · 2025 report, page 15 | 1.3 ppt | 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.
Fluoride
Found: Fluoride
What removes it: Reverse osmosis.
PFAS ("forever chemicals")
Found: PFOA (a PFAS), PFOS (a PFAS)
What removes it: Reverse osmosis.
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