Harris County, TX

ZIP 77338

In ZIP 77338, 7 of the 12 things we check have at least one part graded D or F.

• Drinking water: Trail Of The Lakes Mud has 2 contaminants at or over an EPA legal limit; 11 contaminants are above health goals, led by arsenic at 842× 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: Equistar Chemicals Bayport Chemicals Plant (26%), mostly ethylene oxide.
• Fine particles (PM2.5) average 8.9 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 38,374 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 77338

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

Based on 13 census tracts · compiled October 25, 2026 · how each grade works and its sources

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