Winnebago County, IL

ZIP 61088

In ZIP 61088, 5 of the 12 things we check have at least one part graded D or F.

• Drinking water: Byron has 1 contaminant at or over an EPA legal limit; 10 contaminants are above health goals, led by arsenic at 296× California’s Public Health Goal.
• Nearest Superfund site: Interstate Pollution Control, Inc., 6.8 miles away (2 within 10 miles).
• Largest share of modeled toxic air from industry: Quality Metal Finishing Co (46%), mostly 1-bromopropane.
• Fine particles (PM2.5) average 7.1 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 190,217 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 61088

• Superfund sites nearbyA to D
• Factories and industrial sitesC
• Oil and gas wellsA to D
• Parks and nature nearbyC
• Air qualityB
• Drinking water qualityA to D
• Pesticide useF
• Neighborhood health statusC
• Past wildfire impactsA
• Past flood impactsA
• Noise levelsA to C
• Radiation signalsD to F

Based on 4 census tracts · compiled October 25, 2026 · how each grade works and its sources

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