Winnebago County, IL

ZIP 61104

In ZIP 61104, 9 of the 12 things we check have at least one part graded D or F.

• Drinking water: Rockford has 1 contaminant at or over an EPA legal limit; 21 contaminants are above health goals, led by lead at 45× California’s Public Health Goal.
• Nearest Superfund site: Interstate Pollution Control, Inc., 0.4 miles away (3 within 10 miles).
• Largest share of modeled toxic air from industry: Swenson Spreader LLC (27%), mostly chromium.
• Fine particles (PM2.5) average 8.3 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 61104

• Superfund sites nearbyF
• Factories and industrial sitesD to F
• Oil and gas wellsA to C
• Parks and nature nearbyD to F
• Air qualityB to D
• Drinking water qualityF
• Pesticide useD
• Neighborhood health statusC to F
• Past wildfire impactsA
• Past flood impactsA
• Noise levelsA to D
• Radiation signalsD

Based on 13 census tracts · compiled September 10, 2026 · how each grade works and its sources

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