Jefferson County, CO

ZIP 80021

In ZIP 80021, 6 of the 12 things we check have at least one part graded D or F.

• Drinking water: Arvada City Of meets every EPA legal limit; 13 contaminants are above health goals, led by arsenic at 350× California’s Public Health Goal.
• Nearest Superfund site: Rocky Flats Plant (usdoe), 5.2 miles away (3 within 10 miles).
• Largest share of modeled toxic air from industry: Terumo Bct Sterilization Services Inc (77%), mostly ethylene oxide.
• Fine particles (PM2.5) average 7.2 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 4,764 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 80021

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

Based on 12 census tracts · compiled September 10, 2026 · how each grade works and its sources

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