Garrett County, MD

ZIP 21521

In ZIP 21521, 5 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 (78%), 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 46,972 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 21521

• Superfund sites nearbyA to C
• Factories and industrial sitesA
• Oil and gas wellsA
• Parks and nature nearbyB to C
• Air qualityB to C
• Drinking water qualityC to F
• Pesticide useD to F
• Neighborhood health statusD to F
• Past wildfire impactsA
• Past flood impactsC to F
• Noise levelsA
• Radiation signalsC to D

Based on 3 census tracts · compiled September 10, 2026 · how each grade works and its sources

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