New Castle County, DE

ZIP 19730

In ZIP 19730, 1 of the 12 things we check have at least one part graded D or F.

• Drinking water: South East Pump District meets every EPA legal limit; 4 contaminants are above health goals, led by dibromochloromethane at 8× California’s Public Health Goal.
• Nearest Superfund site: Sealand Limited, 4.6 miles away (2 within 10 miles).
• Largest share of modeled toxic air from industry: Croda Inc (82%), mostly ethylene oxide.
• Fine particles (PM2.5) average 7.1 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 97,688 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 19730

• Superfund sites nearbyA
• Factories and industrial sitesB
• Oil and gas wellsA
• Parks and nature nearbyB
• Air qualityB
• Drinking water qualityB
• Pesticide useD
• Neighborhood health statusA
• Past wildfire impactsA
• Past flood impactsC
• Noise levelsA
• Radiation signalsB

Based on 1 census tract · compiled October 25, 2026 · how each grade works and its sources

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