Adams County, CO

ZIP 80221

In ZIP 80221, 7 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, 2.6 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 7.4 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 165,365 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 80221

• Superfund sites nearbyF
• Factories and industrial sitesD to F
• Oil and gas wellsB
• Parks and nature nearbyD
• Air qualityC
• Drinking water qualityC to F
• Pesticide useB to F
• Neighborhood health statusB to C
• Past wildfire impactsA
• Past flood impactsA
• Noise levelsA to D
• Radiation signalsD

Based on 13 census tracts · compiled September 10, 2026 · how each grade works and its sources

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