Shawnee County, KS

ZIP 66603

In ZIP 66603, 7 of the 12 things we check have at least one part graded D or F.

• Drinking water: Topeka, City Of meets every EPA legal limit; 4 contaminants are above health goals, led by arsenic at 186× California’s Public Health Goal.
• Nearest Superfund site: Hydro-Flex Inc., 3.9 miles away.
• Largest share of modeled toxic air from industry: American Phoenix Inc. - Topeka Ks (41%), mostly cobalt compounds.
• Fine particles (PM2.5) average 8.3 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 103,017 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 66603

• Superfund sites nearbyA
• Factories and industrial sitesD
• Oil and gas wellsA
• Parks and nature nearbyC to D
• Air qualityD
• Drinking water qualityC
• Pesticide useC to D
• Neighborhood health statusF
• Past wildfire impactsA
• Past flood impactsC
• Noise levelsA to D
• Radiation signalsD

Based on 3 census tracts · compiled October 25, 2026 · how each grade works and its sources

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