Tulare County, CA

ZIP 93257

In ZIP 93257, 9 of the 12 things we check have at least one part graded D or F.

• Drinking water: Porterville Developmental Center meets every EPA legal limit; 10 contaminants are above health goals, led by lead at 33× 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: Gfp Ethanol LLC Dba Calgren Renewable Fuels (94%), mostly acrolein.
• Fine particles (PM2.5) average 9.2 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 5,378,638 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 93257

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

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

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