Boulder County, CO

ZIP 80304

In ZIP 80304, 5 of the 12 things we check have at least one part graded D or F.

• Drinking water: Spring Valley Mutual Wa meets every EPA legal limit; 7 contaminants are above health goals, led by pfoa at 71× 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 (88%), 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
• Oil and gas wellsA to B
• Parks and nature nearbyA to B
• Air qualityA to B
• Drinking water qualityC
• Pesticide useB to C
• 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 October 25, 2026 · how each grade works and its sources

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