Johnson County, KS

ZIP 66021

In ZIP 66021, 3 of the 12 things we check have at least one part graded D or F.

• Drinking water: Miami Co Rwd 2 meets every EPA legal limit; 8 contaminants are above health goals, led by bromodichloromethane at 179× California’s Public Health Goal.
• Nearest Superfund site: Chemical Commodities, Inc., 9.3 miles away.
• Largest share of modeled toxic air from industry: Harcros Chemicals Inc (72%), mostly ethylene oxide.
• Fine particles (PM2.5) average 7.2 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 84,462 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 66021

• Superfund sites nearbyA to C
• Factories and industrial sitesA to C
• Oil and gas wellsF
• Parks and nature nearbyB to C
• Air qualityB to C
• Drinking water qualityC
• Pesticide useD to F
• Neighborhood health statusB to C
• Past wildfire impactsA
• Past flood impactsB
• Noise levelsA to C
• Radiation signalsD to F

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

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