Arapahoe County, CO

ZIP 80120

In ZIP 80120, 4 of the 12 things we check have at least one part graded D or F.

• Drinking water: Highlands Ranch Wsd meets every EPA legal limit; 11 contaminants are above health goals, led by arsenic at 408× California’s Public Health Goal.
• Nearest Superfund site: Denver Radium Site, 7.9 miles away (2 within 10 miles).
• Largest share of modeled toxic air from industry: Terumo Bct Sterilization Services Inc (93%), mostly ethylene oxide.
• Fine particles (PM2.5) average 7.3 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 41,186 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 80120

• Superfund sites nearbyC to D
• Factories and industrial sitesC to D
• Oil and gas wellsA to B
• Parks and nature nearbyB to C
• Air qualityA to C
• Drinking water qualityC
• Pesticide useA to B
• Neighborhood health statusA to C
• Past wildfire impactsA
• Past flood impactsA
• Noise levelsA to D
• Radiation signalsF

Based on 11 census tracts · compiled October 25, 2026 · how each grade works and its sources

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