Galveston County, TX

ZIP 77550

In ZIP 77550, 6 of the 12 things we check have at least one part graded D or F.

• Drinking water: City Of Galveston meets every EPA legal limit; 8 contaminants are above health goals, led by bromodichloromethane at 237× California’s Public Health Goal.
• Nearest Superfund site: Malone Service Co - Swan Lake Plant, 6.5 miles away (3 within 10 miles).
• Largest share of modeled toxic air from industry: Equistar Chemicals Bayport Chemicals Plant (35%), mostly ethylene oxide.
• Fine particles (PM2.5) average 8.1 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 77550

• Superfund sites nearbyA to D
• Factories and industrial sitesD to F
• Oil and gas wellsD to F
• Parks and nature nearbyB to C
• Air qualityB to D
• Drinking water qualityC
• Pesticide useB
• Neighborhood health statusB to F
• Past wildfire impactsA
• Past flood impactsC
• Noise levelsA to D

Based on 16 census tracts · compiled October 25, 2026 · how each grade works and its sources

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