Johnson County, KS

ZIP 66030

In ZIP 66030, 5 of the 12 things we check have at least one part graded D or F.

• Drinking water: Marais Des Cygnes Public Utility Auth meets every EPA legal limit; 9 contaminants are above health goals, led by bromodichloromethane at 142× California’s Public Health Goal.
• Nearest Superfund site: Chemical Commodities, Inc., 6.4 miles away.
• Largest share of modeled toxic air from industry: Harcros Chemicals Inc (76%), 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 49,881 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 66030

• Superfund sites nearbyA to D
• Factories and industrial sitesC to D
• Oil and gas wellsF
• Parks and nature nearbyC
• Air qualityB to C
• Drinking water qualityC
• Pesticide useB to D
• Neighborhood health statusA to C
• Past wildfire impactsA
• Past flood impactsB
• Noise levelsA to C
• Radiation signalsF

Based on 9 census tracts · compiled October 25, 2026 · how each grade works and its sources

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