Fairfax County, VA

ZIP 22066

In ZIP 22066, 4 of the 12 things we check have at least one part graded D or F.

• Drinking water: Fairfax County Water Authority has 2 contaminants at or over an EPA legal limit; 12 contaminants are above health goals, led by pfos at 5.2× California’s Public Health Goal.
• Nearest Superfund site: Hidden Lane Landfill, 3.9 miles away.
• Largest share of modeled toxic air from industry: Micron Technology Inc. (49%), mostly chlorine.
• Fine particles (PM2.5) average 7.5 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 22066

• Superfund sites nearbyA to D
• Factories and industrial sitesB
• Oil and gas wellsA
• Parks and nature nearbyC to D
• Air qualityB to C
• Drinking water qualityD to F
• Pesticide useB to C
• Neighborhood health statusB
• Past wildfire impactsA
• Past flood impactsB to C
• Noise levelsA
• Radiation signalsD

Based on 5 census tracts · compiled September 10, 2026 · how each grade works and its sources

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