Washtenaw County, MI

ZIP 48109

In ZIP 48109, 6 of the 12 things we check have at least one part graded D or F.

• Drinking water: Ann Arbor has 1 contaminant at or over an EPA legal limit; 8 contaminants are above health goals, led by pfos at 43× California’s Public Health Goal.
• Closer to Superfund sites than 0% of U.S. neighborhoods, with no listed site within 10 miles of its center.
• Largest share of modeled toxic air from industry: Michigan Seamless Tube LLC (37%), mostly chromium.
• Fine particles (PM2.5) average 7.9 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 123,801 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 48109

• Superfund sites nearbyA
• Factories and industrial sitesA to C
• Oil and gas wellsB to C
• Parks and nature nearbyD to F
• Air qualityD
• Drinking water qualityF
• Pesticide useD to F
• Neighborhood health statusA to B
• 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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