Marion County, IN

ZIP 46231

In ZIP 46231, 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; 13 contaminants are above health goals, led by arsenic at 245× California’s Public Health Goal.
• Nearest Superfund site: Southside Sanitary Landfill, 5.0 miles away (3 within 10 miles).
• Largest share of modeled toxic air from industry: Linde Advanced Material Technologies Inc (59%), mostly cobalt compounds.
• 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 46231

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

Based on 9 census tracts · compiled October 25, 2026 · how each grade works and its sources

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