Jefferson County, CO

ZIP 80403

In ZIP 80403, 6 of the 12 things we check have at least one part graded D or F.

• Drinking water: Mt Vernon Country Club has 1 contaminant at or over an EPA legal limit; 11 contaminants are above health goals, led by pfos at 2.2× California’s Public Health Goal.
• Nearest Superfund site: Rocky Flats Plant (usdoe), 9.4 miles away.
• Largest share of modeled toxic air from industry: Terumo Bct Sterilization Services Inc (91%), mostly ethylene oxide.
• Fine particles (PM2.5) average 7.1 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 1,017 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 80403

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

Based on 13 census tracts · compiled September 10, 2026 · how each grade works and its sources

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