Montgomery County, MD

ZIP 20903

In ZIP 20903, 4 of the 12 things we check have at least one part graded D or F.

• Drinking water: Washington Suburban Sanitary Commission meets every EPA legal limit; 4 contaminants are above health goals, led by bromodichloromethane at 96× California’s Public Health Goal.
• Nearest Superfund site: Beltsville Agricultural Research Center (usda), 4.8 miles away (2 within 10 miles).
• Largest share of modeled toxic air from industry: Elite Spice Inc. (53%), mostly ethylene oxide.
• Fine particles (PM2.5) average 8.4 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 20903

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

Based on 12 census tracts · compiled October 25, 2026 · how each grade works and its sources

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