Harford County, MD

ZIP 21040

In ZIP 21040, 5 of the 12 things we check have at least one part graded D or F.

• Drinking water: City Of Aberdeen has 2 contaminants at or over an EPA legal limit; 11 contaminants are above health goals, led by pfoa at 786× California’s Public Health Goal.
• Nearest Superfund site: Aberdeen Proving Ground (michaelsville Landfill), 0.4 miles away (3 within 10 miles).
• Largest share of modeled toxic air from industry: Elite Spice Inc. (55%), mostly ethylene oxide.
• Fine particles (PM2.5) average 8.0 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 93,693 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 21040

• Superfund sites nearbyF
• Factories and industrial sitesB to C
• Oil and gas wellsA
• Parks and nature nearbyB to C
• Air qualityB to D
• Drinking water qualityA to F
• Pesticide useC to D
• Neighborhood health statusA to D
• Past wildfire impactsA
• Past flood impactsB to C
• Noise levelsA to C

Based on 7 census tracts · compiled October 25, 2026 · how each grade works and its sources

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