Washington County, MD

ZIP 21758

In ZIP 21758, 3 of the 12 things we check have at least one part graded D or F.

• Drinking water: Corporation Of Harpers Ferry meets every EPA legal limit; 9 contaminants are above health goals, led by bromodichloromethane at 96× California’s Public Health Goal.
• Nearest Superfund site: Fort Detrick Area B Ground Water, 9.2 miles away.
• Largest share of modeled toxic air from industry: Holcim(Us) Inc. (51%), mostly chromium.
• Fine particles (PM2.5) average 7.2 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 196,170 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 21758

• Superfund sites nearbyA to C
• Factories and industrial sitesA to B
• Oil and gas wellsA
• Parks and nature nearbyB to C
• Air qualityB
• Drinking water qualityA to C
• Pesticide useC to F
• Neighborhood health statusB to D
• Past wildfire impactsA
• Past flood impactsB
• Noise levelsA to C
• Radiation signalsB to F

Based on 5 census tracts · compiled October 25, 2026 · how each grade works and its sources

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