Johnson County, KS

ZIP 66251

In ZIP 66251, 5 of the 12 things we check have at least one part graded D or F.

• Drinking water: Water District 1 Of Johnson Co meets every EPA legal limit; 10 contaminants are above health goals, led by lithium at 3.4× the USGS health-based screening level.
• Nearest Superfund site: Chemical Commodities, Inc., 8.8 miles away.
• Largest share of modeled toxic air from industry: Harcros Chemicals Inc (77%), mostly ethylene oxide.
• Fine particles (PM2.5) average 8.7 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 66251

• Superfund sites nearbyA
• Factories and industrial sitesF
• Oil and gas wellsF
• Parks and nature nearbyC
• Air qualityF
• Drinking water qualityC
• Pesticide useD
• Neighborhood health statusB
• Past wildfire impactsA
• Past flood impactsB
• Noise levelsA
• Radiation signalsF

Based on 1 census tract · compiled October 25, 2026 · how each grade works and its sources

Loading the full report, with every source…