Allegany County, MD

ZIP 21540

In ZIP 21540, 4 of the 12 things we check have at least one part graded D or F.

• Drinking water: Piedmont Municipal Wtr Wks meets every EPA legal limit; 10 contaminants are above health goals, led by lead at 35× California’s Public Health Goal.
• Nearest Superfund site: Allegany Ballistics Laboratory (usnavy), 8.9 miles away.
• Largest share of modeled toxic air from industry: Aes Warrior Run Inc (74%), mostly arsenic compounds.
• Fine particles (PM2.5) average 7.3 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 16,147 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 21540

• Superfund sites nearbyC
• Factories and industrial sitesA
• Oil and gas wellsA
• Parks and nature nearbyC
• Air qualityC
• Drinking water qualityC to F
• Pesticide useD
• Neighborhood health statusF
• Past wildfire impactsA
• Past flood impactsC
• Noise levelsA
• Radiation signalsD

Based on 1 census tract · compiled September 10, 2026 · how each grade works and its sources

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