Allegany County, MD

ZIP 21543

In ZIP 21543, 4 of the 12 things we check have at least one part graded D or F.

• Drinking water: Midland-Lonaconing meets every EPA legal limit; 9 contaminants are above health goals, led by di(2-ethylhexyl) phthalate at 4.7× California’s Public Health Goal.
• Nearest Superfund site: Allegany Ballistics Laboratory (usnavy), 6.2 miles away.
• Largest share of modeled toxic air from industry: Aes Warrior Run Inc (82%), mostly arsenic compounds.
• Fine particles (PM2.5) average 7.0 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 21543

• Superfund sites nearbyD
• Factories and industrial sitesA
• Oil and gas wellsA
• Parks and nature nearbyC
• Air qualityB
• Drinking water qualityA to C
• Pesticide useD
• Neighborhood health statusF
• Past wildfire impactsA
• Past flood impactsF
• Noise levelsC
• Radiation signalsC

Based on 1 census tract · compiled October 25, 2026 · how each grade works and its sources

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