Riley County, KS

ZIP 66506

In ZIP 66506, 3 of the 12 things we check have at least one part graded D or F.

• Drinking water: Manhattan, City Of meets every EPA legal limit; 12 contaminants are above health goals, led by arsenic at 538× California’s Public Health Goal.
• Closer to Superfund sites than 63% 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 (100%), mostly chromium compounds.
• Fine particles (PM2.5) average 7.6 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 66506

• Superfund sites nearbyD
• Factories and industrial sitesB
• Oil and gas wellsB to C
• Parks and nature nearbyB to C
• Air qualityB to C
• Drinking water qualityC
• Pesticide useD to F
• Neighborhood health statusA
• Past wildfire impactsA
• Past flood impactsC
• Noise levelsA
• Radiation signalsF

Based on 2 census tracts · compiled October 25, 2026 · how each grade works and its sources

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