Fairfax County, VA

ZIP 20171

In ZIP 20171, 3 of the 12 things we check have at least one part graded D or F.

• Drinking water: Fairfax County Water Authority meets every EPA legal limit; 11 contaminants are above health goals, led by pfos at 2.3× California’s Public Health Goal.
• Nearest Superfund site: Hidden Lane Landfill, 7.6 miles away.
• Largest share of modeled toxic air from industry: Micron Technology Inc. (50%), mostly chlorine.
• Fine particles (PM2.5) average 8.0 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 3,774 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 20171

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

Based on 16 census tracts · compiled October 25, 2026 · how each grade works and its sources

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