Howard County, MD

ZIP 20777

In ZIP 20777, 1 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.
• Closer to Superfund sites than 0% of U.S. neighborhoods, with no listed site within 10 miles of its center.
• Largest share of modeled toxic air from industry: Elite Spice Inc. (55%), mostly ethylene oxide.
• Fine particles (PM2.5) average 7.2 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 20777

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

Based on 3 census tracts · compiled October 25, 2026 · how each grade works and its sources

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