Gilpin County, CO

ZIP 80427

In ZIP 80427, 4 of the 12 things we check have at least one part graded D or F.

• Drinking water: Central City City Of meets every EPA legal limit; 7 contaminants are above health goals, led by arsenic at 243× California’s Public Health Goal.
• Nearest Superfund site: Central City, Clear Creek, 9.5 miles away.
• Largest share of modeled toxic air from industry: Terumo Bct Sterilization Services Inc (91%), mostly ethylene oxide.
• Fine particles (PM2.5) average 4.6 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 78 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 80427

• Superfund sites nearbyF
• Factories and industrial sitesB
• Oil and gas wellsA
• Parks and nature nearbyB
• Air qualityA
• Drinking water qualityD
• Pesticide useC
• Neighborhood health statusC
• Past wildfire impactsA
• Past flood impactsA
• Noise levelsD
• Radiation signalsD

Based on 1 census tract · compiled September 10, 2026 · how each grade works and its sources

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