Larimer County, CO

ZIP 80545

In ZIP 80545, 4 of the 12 things we check have at least one part graded D or F.

• Drinking water: Northern Colorado Wa meets every EPA legal limit; 9 contaminants are above health goals, led by arsenic at 850× 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 (49%), mostly chromium compounds.
• Fine particles (PM2.5) average 5.8 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 80545

• Superfund sites nearbyA
• Factories and industrial sitesA to B
• Oil and gas wellsA
• Parks and nature nearbyB
• Air qualityA
• Drinking water qualityC to D
• Pesticide useD to F
• Neighborhood health statusC
• Past wildfire impactsA to F
• Past flood impactsA
• Noise levelsA
• Radiation signalsD to F

Based on 3 census tracts · compiled September 10, 2026 · how each grade works and its sources

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