Fairfield County, CT

ZIP 06820

In ZIP 06820, 2 of the 12 things we check have at least one part graded D or F.

• Drinking water: South Norwalk Electric & Water meets every EPA legal limit; 8 contaminants are above health goals, led by bromodichloromethane at 164× California’s Public Health Goal.
• Nearest Superfund site: Kellogg-Deering Well Field, 5.2 miles away.
• Largest share of modeled toxic air from industry: Colors & Effects USA LLC - Peekskill Facility (66%), mostly chromium compounds.
• Fine particles (PM2.5) average 7.6 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 7,578 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 06820

• Superfund sites nearbyD
• Factories and industrial sitesC
• Oil and gas wellsA
• Parks and nature nearbyC
• Air qualityB to C
• Drinking water qualityC
• Pesticide useB
• Neighborhood health statusA
• Past wildfire impactsA
• Past flood impactsC
• Noise levelsA to D

Based on 5 census tracts · compiled October 25, 2026 · how each grade works and its sources

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