Washington County, MD

ZIP 21740

In ZIP 21740, 9 of the 12 things we check have at least one part graded D or F.

• Drinking water: Mount Aetna has 1 contaminant at or over an EPA legal limit; 7 contaminants are above health goals, led by pfos at 4.9× California’s Public Health Goal.
• Nearest Superfund site: Central Chemical (hagerstown), 2.0 miles away.
• Largest share of modeled toxic air from industry: Engineered Polymer Solutions Inc. (34%), mostly butyl acrylate.
• Fine particles (PM2.5) average 8.0 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 144,043 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 21740

• Superfund sites nearbyC to F
• Factories and industrial sitesA to F
• Oil and gas wellsA
• Parks and nature nearbyB to F
• Air qualityB to D
• Drinking water qualityB to D
• Pesticide useD to F
• Neighborhood health statusB to F
• Past wildfire impactsA
• Past flood impactsB
• Noise levelsA to D
• Radiation signalsF

Based on 21 census tracts · compiled October 25, 2026 · how each grade works and its sources

Loading the full report, with every source…