Weld County, CO

ZIP 80621

In ZIP 80621, 7 of the 12 things we check have at least one part graded D or F.

• Drinking water: Wattenberg Improvement Assoc meets every EPA legal limit; 12 contaminants are above health goals, led by pfos at 2.8× 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: Arc Colorado Inc. (75%), mostly trichloroethylene.
• Fine particles (PM2.5) average 6.6 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 542,391 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 80621

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

Based on 14 census tracts · compiled September 10, 2026 · how each grade works and its sources

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