Loudoun County, VA

ZIP 20158

In ZIP 20158, 2 of the 12 things we check have at least one part graded D or F.

• Drinking water: Oak Hill Mobile Home Community Llc meets every EPA legal limit; 10 contaminants are above health goals, led by arsenic at 419× 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: Trex - Virginia Manufacturing Operations (61%), mostly chromium compounds.
• Fine particles (PM2.5) average 6.9 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 20158

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

Based on 4 census tracts · compiled October 25, 2026 · how each grade works and its sources

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