Prince William County, VA

ZIP 22191

In ZIP 22191, 6 of the 12 things we check have at least one part graded D or F.

• Drinking water: Dale City has 2 contaminants at or over an EPA legal limit; 11 contaminants are above health goals, led by pfos at 5.1× California’s Public Health Goal.
• Nearest Superfund site: Indian Head Naval Surface Warfare Center, 4.7 miles away (2 within 10 miles).
• Largest share of modeled toxic air from industry: Micron Technology Inc. (43%), mostly chlorine.
• Fine particles (PM2.5) average 7.9 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 19,388 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 22191

• Superfund sites nearbyC to F
• Factories and industrial sitesA to B
• Oil and gas wellsA
• Parks and nature nearbyC to D
• Air qualityB to D
• Drinking water qualityF
• Pesticide useC to D
• Neighborhood health statusB to C
• Past wildfire impactsA
• Past flood impactsC
• Noise levelsA to D
• Radiation signalsB

Based on 16 census tracts · compiled September 10, 2026 · how each grade works and its sources

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