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: El Rancho Mobile Home Park meets every EPA legal limit; 4 contaminants are above health goals, led by pfos at 3.8× California’s Public Health Goal.
• Nearest Superfund site: Central Chemical (hagerstown), 2.0 miles away.
• Largest share of modeled toxic air from industry: Holcim(Us) Inc. (97%), mostly chromium.
• 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 sitesB to D
• Oil and gas wellsA
• Parks and nature nearbyC to F
• Air qualityB to D
• Drinking water qualityC to F
• Pesticide useD to F
• Neighborhood health statusB to F
• Past wildfire impactsA
• Past flood impactsB
• Noise levelsA to D
• Radiation signalsD to F

Based on 21 census tracts · compiled September 10, 2026 · how each grade works and its sources

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