Rio Arriba County, NM

ZIP 87511

In ZIP 87511, 5 of the 12 things we check have at least one part graded D or F.

• Drinking water: Alcalde Mdwca has 1 contaminant at or over an EPA legal limit; 8 contaminants are above health goals, led by arsenic at 5,153× California’s Public Health Goal.
• Nearest Superfund site: North Railroad Avenue Plume, 4.4 miles away.
• Largest share of modeled toxic air from industry: U.S. Department Of Energy Los Alamos National Laboratory (100%), mostly lead.
• Fine particles (PM2.5) average 6.0 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 31,004 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 87511

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

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

Loading the full report, with every source…