Broomfield County, CO

ZIP 80023

In ZIP 80023, 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: Marshall Landfill, 8.4 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 7.2 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 80023

• Superfund sites nearbyA to C
• Factories and industrial sitesB to D
• Oil and gas wellsD to F
• Parks and nature nearbyC to D
• Air qualityA to C
• Drinking water qualityC to F
• Pesticide useC to F
• Neighborhood health statusA to D
• Past wildfire impactsA
• Past flood impactsA to C
• Noise levelsA
• Radiation signalsD to F

Based on 11 census tracts · compiled September 10, 2026 · how each grade works and its sources

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