Boulder County, CO
ZIP 80303
In ZIP 80303, 7 of the 12 things we check have at least one part graded D or F.
- Drinking water: Superior Md No 1 meets every EPA legal limit; 5 contaminants are above health goals, led by chloroform at 94× California’s Public Health Goal.
- Nearest Superfund site: Marshall Landfill, 0.5 miles away (2 within 10 miles).
- Largest share of modeled toxic air from industry: Terumo Bct Sterilization Services Inc (85%), mostly ethylene oxide.
- Fine particles (PM2.5) average 6.7 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 80303
- Superfund sites nearbyD to F
- Factories and industrial sitesC to D
- Oil and gas wellsA to D
- Parks and nature nearbyA to C
- Air qualityA to B
- Drinking water qualityB to C
- Pesticide useB to D
- Neighborhood health statusA to B
- Past wildfire impactsA
- Past flood impactsC to D
- Noise levelsA to D
- Radiation signalsD to F
Based on 13 census tracts · compiled October 25, 2026 · how each grade works and its sources
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