Chester County, PA

ZIP 19457

In ZIP 19457, 6 of the 12 things we check have at least one part graded D or F.

• Drinking water: Pa American Royersford has 2 contaminants at or over an EPA legal limit; 20 contaminants are above health goals, led by pfos at 5.9× California’s Public Health Goal.
• Nearest Superfund site: Occidental Chemical Corp./firestone Tire & Rubber Co., 1.6 miles away (3 within 10 miles).
• Largest share of modeled toxic air from industry: Carpenter Technology Corp (52%), mostly chromium compounds.
• Fine particles (PM2.5) average 8.0 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 19457

• Superfund sites nearbyF
• Factories and industrial sitesD
• Oil and gas wellsA
• Parks and nature nearbyC
• Air qualityD
• Drinking water qualityD to F
• Pesticide useF
• Neighborhood health statusC
• Past wildfire impactsA
• Past flood impactsC
• Noise levelsA
• Radiation signalsD

Based on 1 census tract · compiled September 10, 2026 · how each grade works and its sources

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