Addison Water Quality (Illinois) – 2025 Report Results

We read 14 results from Addison’s 2025 water quality report. No results over a legal limit; 5 above a health goal or guideline.

Serves about 38,017 people · Water system ID IL0430050 · 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 ND to 3 · listed as a violation in the report · Emergency backup wells, highest of 2 sources · 2025 report, page 7	3 ppb	0.004 ppb	10 ppb	Above the health goal750x the health goal
Gross alpha (radioactivity)highest measured · range ND to 4.61 · listed as a violation in the report · sampled 2023 · Emergency backup wells · 2025 report, page 7	4.61 pCi/L	0 pCi/L	15 pCi/L	Above the health goalThe health goal is zero
Lead90th percentile of homes tested, 2 over the action level · listed as a violation in the report · Customer taps · 2025 report, page 6	5.2 ppb	0.2 ppb	15 ppb (action level)	Above the health goal26x the health goal
Manganesehighest measured · range 0.01 to 0.06 · printed as 55 ppb · Emergency backup wells · 2025 report, page 7	0.06 ppm	—	0.05 ppm guideline	Above the guideline1.1x the guideline (taste, odor or stains; not a health limit)
Radium (combined 226 + 228)highest measured · range 0.41 to 2.93 · listed as a violation in the report · sampled 2023 · Emergency backup wells · 2025 report, page 7	2.93 pCi/L	0 pCi/L	5 pCi/L	Above the health goalThe health goal is zero
Bariumhighest measured · range 0.01 to 0.05 · listed as a violation in the report · Emergency backup wells, highest of 2 sources · 2025 report, page 6	0.05 ppm	2 ppm	2 ppm	Below the health goal
Chlorinehighest measured · range 0.8 to 1.3 · listed as a violation in the report · Distribution system · 2025 report, page 6	1.1 ppm	None set	4 ppm	Below the legal limit
Disinfection byproducts (HAA5)highest measured · range 5.25 to 21.1 · listed as a violation in the report · Distribution system · 2025 report, page 6	16 ppb	None set	60 ppb	Below the legal limit
Disinfection byproducts (TTHM)highest measured · range 13.6 to 72 · listed as a violation in the report · Distribution system · 2025 report, page 6	43 ppb	None set	80 ppb	Below the legal limit
Fluoridehighest measured · range 0.65 to 0.75 · Chicago (purchased water), highest of 2 sources · 2025 report, page 8	0.75 ppm	1 ppm	4 ppm	Below the health goal
Nitrate (as N)highest measured · range 0.32 to 0.36 · Chicago (purchased water) · 2025 report, page 8	0.36 ppm	10 ppm	10 ppm	Below the health goal
Seleniumhighest measured · range ND to 2.8 · listed as a violation in the report · sampled 2024 · Emergency backup wells · 2025 report, page 7	2.8 ppb	30 ppb	50 ppb	Below the health goal
Sulfatehighest measured · range 26.8 to 27.2 · Chicago (purchased water) · 2025 report, page 8	27.2 ppm	—	250 ppm guideline	Within the guideline
Sodiumhighest measured · range 54 to 210 · Emergency backup wells, highest of 2 sources · 2025 report, page 7	210 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.

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.