Riley County, KS

ZIP 66506

In ZIP 66506, 5 of the 12 things we check have at least one part graded D or F.

• Drinking water: Manhattan, City Of has 1 contaminant at or over an EPA legal limit; 17 contaminants are above health goals, led by lead at 17× 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 sitesC
• Oil and gas wellsB to C
• Parks and nature nearbyD to F
• Air qualityB to C
• Drinking water qualityD
• Pesticide useD to F
• Neighborhood health statusB
• Past wildfire impactsA
• Past flood impactsC
• Noise levelsA
• Radiation signalsD

Based on 2 census tracts · compiled September 10, 2026 · how each grade works and its sources

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