Sussex County, DE

ZIP 19966

In ZIP 19966, 6 of the 12 things we check have at least one part graded D or F.

• Drinking water: Town Of Delmar meets every EPA legal limit; 11 contaminants are above health goals, led by pfos at 3.1× California’s Public Health Goal.
• Nearest Superfund site: Ncr Corp. (millsboro Plant), 1.2 miles away (3 within 10 miles).
• Largest share of modeled toxic air from industry: Trinity Sterile (82%), mostly ethylene oxide.
• Fine particles (PM2.5) average 6.2 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 538,410 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 19966

• Superfund sites nearbyA to F
• Factories and industrial sitesA to C
• Oil and gas wellsA
• Parks and nature nearbyC to D
• Air qualityA
• Drinking water qualityC to F
• Pesticide useF
• Neighborhood health statusC to F
• Past wildfire impactsA
• Past flood impactsB to F
• Noise levelsA to C
• Radiation signalsB

Based on 15 census tracts · compiled September 10, 2026 · how each grade works and its sources

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