Chester County, PA

ZIP 19311

In ZIP 19311, 5 of the 12 things we check have at least one part graded D or F.

• Drinking water: Chester Water Authority meets every EPA legal limit; 12 contaminants are above health goals, led by lead at 48× California’s Public Health Goal.
• Nearest Superfund site: Hockessin Groundwater, 6.5 miles away (3 within 10 miles).
• Largest share of modeled toxic air from industry: Goodhart Sons Inc. (83%), mostly chromium.
• Fine particles (PM2.5) average 6.8 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 156,614 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 19311

• Superfund sites nearbyC to D
• Factories and industrial sitesB to C
• Oil and gas wellsA
• Parks and nature nearbyC to D
• Air qualityB
• Drinking water qualityD to F
• Pesticide useD to F
• Neighborhood health statusB to C
• Past wildfire impactsA
• Past flood impactsC
• Noise levelsA to C
• Radiation signalsD to F

Based on 8 census tracts · compiled September 10, 2026 · how each grade works and its sources

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