Loudoun County, VA

ZIP 20175

In ZIP 20175, 6 of the 12 things we check have at least one part graded D or F.

• Drinking water: Round Hill, Town Of has 1 contaminant at or over an EPA legal limit; 11 contaminants are above health goals, led by lead at 38× California’s Public Health Goal.
• Nearest Superfund site: Hidden Lane Landfill, 5.5 miles away.
• Largest share of modeled toxic air from industry: Micron Technology Inc. (71%), mostly chlorine.
• Fine particles (PM2.5) average 7.7 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 97,008 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 20175

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

Based on 13 census tracts · compiled September 10, 2026 · how each grade works and its sources

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