Marion County, IN

ZIP 46278

In ZIP 46278, 8 of the 12 things we check have at least one part graded D or F.

• Drinking water: Citizens Water - Indianapolis meets every EPA legal limit; 17 contaminants are above health goals, led by lead at 20× California’s Public Health Goal.
• Nearest Superfund site: Keystone Corridor Ground Water Contamination, 6.9 miles away (3 within 10 miles).
• Largest share of modeled toxic air from industry: Linde Advanced Material Technologies Inc (46%), mostly diisocyanates.
• Fine particles (PM2.5) average 9.2 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 171,741 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 46278

• Superfund sites nearbyA to C
• Factories and industrial sitesD
• Oil and gas wellsA
• Parks and nature nearbyC to F
• Air qualityD to F
• Drinking water qualityD
• Pesticide useB to F
• Neighborhood health statusB to D
• Past wildfire impactsA
• Past flood impactsA
• Noise levelsA to D
• Radiation signalsD

Based on 8 census tracts · compiled September 10, 2026 · how each grade works and its sources

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