San Bernardino County, CA

ZIP 92304

In ZIP 92304, 5 of the 12 things we check have at least one part graded D or F.

• Drinking water: Twentynine Palms Water District meets every EPA legal limit; 12 contaminants are above health goals, led by lead at 32× California’s Public Health Goal.
• Closer to Superfund sites than 74% 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 (100%), mostly lead compounds.
• Fine particles (PM2.5) average 5.4 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 52,223 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 92304

• Superfund sites nearbyA to D
• Factories and industrial sitesA
• Oil and gas wellsA
• Parks and nature nearbyB
• Air qualityA
• Drinking water qualityD to F
• Pesticide useC
• Neighborhood health statusF
• Past wildfire impactsA
• Past flood impactsA
• Noise levelsD
• Radiation signalsD

Based on 2 census tracts · compiled September 10, 2026 · how each grade works and its sources

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