Calhoun County, TX

ZIP 77978

In ZIP 77978, 6 of the 12 things we check have at least one part graded D or F.

• Drinking water: Tri County Point Water System 4 meets every EPA legal limit; 8 contaminants are above health goals, led by lead at 139× California’s Public Health Goal.
• Nearest Superfund site: Alcoa (point Comfort)/lavaca Bay, 2.4 miles away.
• Largest share of modeled toxic air from industry: Formosa Plastics Corp Texas (99%), mostly ethylene oxide.
• Fine particles (PM2.5) average 6.9 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 87,141 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 77978

• Superfund sites nearbyF
• Factories and industrial sitesD
• Oil and gas wellsF
• Parks and nature nearbyC
• Air qualityB
• Drinking water qualityD to F
• Pesticide useF
• Neighborhood health statusD
• Past wildfire impactsA
• Past flood impactsB
• Noise levelsA
• Radiation signalsB

Based on 1 census tract · compiled September 10, 2026 · how each grade works and its sources

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