Boulder County, CO

ZIP 80025

In ZIP 80025, 5 of the 12 things we check have at least one part graded D or F.

• Drinking water: Eldorado Municipal System meets every EPA legal limit; 4 contaminants are above health goals, led by arsenic at 1,900× California’s Public Health Goal.
• Nearest Superfund site: Marshall Landfill, 4.6 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 6.3 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 80025

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

Based on 1 census tract · compiled September 10, 2026 · how each grade works and its sources

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