Adams County, CO

ZIP 80234

In ZIP 80234, 8 of the 12 things we check have at least one part graded D or F.

• Drinking water: Thornton City Of has 2 contaminants at or over an EPA legal limit; 18 contaminants are above health goals, led by pfos at 4× California’s Public Health Goal.
• Nearest Superfund site: Broderick Wood Products, 5.2 miles away (3 within 10 miles).
• Largest share of modeled toxic air from industry: Terumo Bct Sterilization Services Inc (84%), mostly ethylene oxide.
• Fine particles (PM2.5) average 7.3 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 80234

• Superfund sites nearbyA to F
• Factories and industrial sitesC to D
• Oil and gas wellsB to F
• Parks and nature nearbyC to D
• Air qualityC
• Drinking water qualityC to F
• Pesticide useD
• Neighborhood health statusB to C
• Past wildfire impactsA
• Past flood impactsA
• 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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