Harris County, TX

ZIP 77520

In ZIP 77520, 8 of the 12 things we check have at least one part graded D or F.

• Drinking water: City Of Baytown has 1 contaminant at or over an EPA legal limit; 10 contaminants are above health goals, led by pfos at 5× California’s Public Health Goal.
• Nearest Superfund site: San Jacinto River Waste Pits, 3.2 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 9.3 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 69,664 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 77520

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

Based on 15 census tracts · compiled October 25, 2026 · how each grade works and its sources

Loading the full report, with every source…