Riley County, KS

ZIP 66502

In ZIP 66502, 6 of the 12 things we check have at least one part graded D or F.

• Drinking water: Frusi Water Treatment Plant has 2 contaminants at or over an EPA legal limit; 13 contaminants are above health goals, led by pfoa at 2,357× California’s Public Health Goal.
• Closer to Superfund sites than 91% of U.S. neighborhoods, with no listed site within 10 miles of its center.
• Largest share of modeled toxic air from industry: Jeffrey Energy Center (90%), mostly chromium compounds.
• Fine particles (PM2.5) average 7.5 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 76,274 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 66502

• Superfund sites nearbyA to F
• Factories and industrial sitesA to B
• Oil and gas wellsA to D
• Parks and nature nearbyB to C
• Air qualityA to C
• Drinking water qualityA to F
• Pesticide useD to F
• Neighborhood health statusA to C
• Past wildfire impactsA
• Past flood impactsC
• Noise levelsA to D
• Radiation signalsD to F

Based on 16 census tracts · compiled October 25, 2026 · how each grade works and its sources

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