Riley County, KS

ZIP 66503

In ZIP 66503, 5 of the 12 things we check have at least one part graded D or F.

• Drinking water: Wabaunsee Co Rwd 2 meets every EPA legal limit; 8 contaminants are above health goals, led by arsenic at 213× California’s Public Health Goal.
• Nearest Superfund site: Fort Riley, 2.8 miles away.
• Largest share of modeled toxic air from industry: Jeffrey Energy Center (100%), mostly chromium compounds.
• Fine particles (PM2.5) average 6.8 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 79,101 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 66503

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

Based on 6 census tracts · compiled October 25, 2026 · how each grade works and its sources

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