Montgomery County, MD

ZIP 20904

In ZIP 20904, 7 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.
• Nearest Superfund site: Beltsville Agricultural Research Center (usda), 4.0 miles away.
• Largest share of modeled toxic air from industry: Elite Spice Inc. (55%), mostly ethylene oxide.
• Fine particles (PM2.5) average 8.8 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 70,837 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 20904

• Superfund sites nearbyD to F
• Factories and industrial sitesB to C
• Oil and gas wellsA
• Parks and nature nearbyD
• Air qualityC to F
• Drinking water qualityD
• Pesticide useB to D
• Neighborhood health statusB to D
• Past wildfire impactsA
• Past flood impactsC
• Noise levelsA to D

Based on 16 census tracts · compiled September 10, 2026 · how each grade works and its sources

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