Lyon County, KS

ZIP 66835

In ZIP 66835, 6 of the 12 things we check have at least one part graded D or F.

• Drinking water: Osage Co Rwd 8 meets every EPA legal limit; 8 contaminants are above health goals, led by lead at 44× California’s Public Health Goal.
• Nearest Superfund site: Tri-County Public Airport, 8.4 miles away.
• Largest share of modeled toxic air from industry: Bunge N.A. Inc (81%), mostly n-hexane (hexane).
• Fine particles (PM2.5) average 6.8 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 91,368 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 66835

• Superfund sites nearbyA to D
• Factories and industrial sitesA to B
• Oil and gas wellsD
• Parks and nature nearbyC
• Air qualityA to B
• Drinking water qualityC to F
• Pesticide useF
• Neighborhood health statusD
• Past wildfire impactsA
• Past flood impactsB
• Noise levelsA
• Radiation signalsC to D

Based on 3 census tracts · compiled September 10, 2026 · how each grade works and its sources

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