San Bernardino County, CA

ZIP 92277

In ZIP 92277, 5 of the 12 things we check have at least one part graded D or F.

• Drinking water: Chuckawalla Valley State Prison has 1 contaminant at or over an EPA legal limit; 7 contaminants are above health goals, led by arsenic at 4,079× 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: U.S. Marine Corps Twentynine Palms Air Ground Combat Center (99%), mostly lead compounds.
• Fine particles (PM2.5) average 5.7 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 1,172,577 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 92277

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

Based on 10 census tracts · compiled October 25, 2026 · how each grade works and its sources

Loading the full report, with every source…