Loudoun County, VA

ZIP 20176

In ZIP 20176, 7 of the 12 things we check have at least one part graded D or F.

• Drinking water: Hamilton, Town Of meets every EPA legal limit; 9 contaminants are above health goals, led by pfos at 3.6× California’s Public Health Goal.
• Nearest Superfund site: Hidden Lane Landfill, 1.9 miles away.
• Largest share of modeled toxic air from industry: Trex - Virginia Manufacturing Operations (21%), mostly chromium compounds.
• Fine particles (PM2.5) average 8.3 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 20176

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

Based on 11 census tracts · compiled September 10, 2026 · how each grade works and its sources

Loading the full report, with every source…