New Castle County, DE

ZIP 19806

In ZIP 19806, 6 of the 12 things we check have at least one part graded D or F.

• Drinking water: Wilmington Water Department has 1 contaminant at or over an EPA legal limit; 12 contaminants are above health goals, led by pfos at 2.3× California’s Public Health Goal.
• Nearest Superfund site: Halby Chemical Co., 2.0 miles away (3 within 10 miles).
• Largest share of modeled toxic air from industry: Croda Inc (64%), mostly ethylene oxide.
• Fine particles (PM2.5) average 8.1 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 19806

• Superfund sites nearbyD to F
• Factories and industrial sitesD
• Oil and gas wellsA
• Parks and nature nearbyB to C
• Air qualityB to D
• Drinking water qualityD
• Pesticide useB to C
• Neighborhood health statusA to F
• Past wildfire impactsA
• Past flood impactsC
• Noise levelsA to D
• Radiation signalsA to B

Based on 8 census tracts · compiled October 25, 2026 · how each grade works and its sources

Loading the full report, with every source…