Galveston County, TX

ZIP 77518

In ZIP 77518, 4 of the 12 things we check have at least one part graded D or F.

• Drinking water: San Leon Mud meets every EPA legal limit; 8 contaminants are above health goals, led by bromodichloromethane at 233× 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: Dixie Chemical Co Inc (41%), mostly propyleneimine.
• Fine particles (PM2.5) average 7.8 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 11,820 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 77518

• Superfund sites nearbyA
• Factories and industrial sitesF
• Oil and gas wellsD to F
• Parks and nature nearbyC to D
• Air qualityC
• Drinking water qualityC
• Pesticide useB to C
• Neighborhood health statusA to F
• Past wildfire impactsA
• Past flood impactsC
• Noise levelsA to C
• Radiation signalsB

Based on 5 census tracts · compiled October 25, 2026 · how each grade works and its sources

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