Larimer County, CO

ZIP 80521

In ZIP 80521, 6 of the 12 things we check have at least one part graded D or F.

• Drinking water: Csu Main And West Housing Campus meets every EPA legal limit; 6 contaminants are above health goals, led by chloroform at 68× California’s Public Health Goal.
• Closer to Superfund sites than 0% of U.S. neighborhoods, with no listed site within 10 miles of its center.
• Largest share of modeled toxic air from industry: Cemex Construction Materials South LLC (38%), mostly chromium compounds.
• Fine particles (PM2.5) average 7.3 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 63,666 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 80521

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

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

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