Harris County, TX

ZIP 77023

In ZIP 77023, 5 of the 12 things we check have at least one part graded D or F.

• Drinking water: City Of Houston meets every EPA legal limit; 15 contaminants are above health goals, led by arsenic at 878× California’s Public Health Goal.
• Nearest Superfund site: Many Diversified Interests, Inc., 3.8 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 38,374 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 77023

• Superfund sites nearbyF
• Factories and industrial sitesF
• Oil and gas wellsA to D
• Parks and nature nearbyC
• Air qualityF
• Drinking water qualityC
• Pesticide useA to B
• Neighborhood health statusB to C
• Past wildfire impactsA
• Past flood impactsC
• Noise levelsA to D
• Radiation signalsB

Based on 7 census tracts · compiled October 25, 2026 · how each grade works and its sources

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