Boulder County, CO

ZIP 80304

In ZIP 80304, 8 of the 12 things we check have at least one part graded D or F.

• Drinking water: Pine Brook Hills Wd meets every EPA legal limit; 10 contaminants are above health goals, led by pfos at 2.1× California’s Public Health Goal.
• Nearest Superfund site: Marshall Landfill, 5.6 miles away (2 within 10 miles).
• Largest share of modeled toxic air from industry: Terumo Bct Sterilization Services Inc (87%), mostly ethylene oxide.
• Fine particles (PM2.5) average 6.8 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 17,327 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 80304

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

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

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