Montgomery County, MD

ZIP 20871

In ZIP 20871, 6 of the 12 things we check have at least one part graded D or F.

• Drinking water: Washington Suburban Sanitary Commission has 2 contaminants at or over an EPA legal limit; 20 contaminants are above health goals, led by arsenic at 274× California’s Public Health Goal.
• Closer to Superfund sites than 55% of U.S. neighborhoods, with no listed site within 10 miles of its center.
• Largest share of modeled toxic air from industry: Menzies Aviation Fueling Operations Wash Dulles Internationa (44%), mostly ethylene oxide.
• Fine particles (PM2.5) average 7.9 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 20871

• Superfund sites nearbyA to C
• Factories and industrial sitesB
• Oil and gas wellsA
• Parks and nature nearbyC to D
• Air qualityB to D
• Drinking water qualityC to D
• Pesticide useC to F
• Neighborhood health statusA to B
• Past wildfire impactsA
• Past flood impactsB
• Noise levelsA to D
• Radiation signalsD to F

Based on 8 census tracts · compiled September 10, 2026 · how each grade works and its sources

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