St. Clair County, MI

ZIP 48040

In ZIP 48040, 6 of the 12 things we check have at least one part graded D or F.

• Drinking water: Port Huron, City Of has 1 contaminant at or over an EPA legal limit; 10 contaminants are above health goals, led by pfos at 4.9× 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: Marysville Ethanol LLC (53%), mostly chromium.
• Fine particles (PM2.5) average 7.0 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 106,588 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 48040

• Superfund sites nearbyA
• Factories and industrial sitesC to D
• Oil and gas wellsD to F
• Parks and nature nearbyD
• Air qualityB
• Drinking water qualityD to F
• Pesticide useD
• Neighborhood health statusC to D
• Past wildfire impactsA
• Past flood impactsA
• Noise levelsA to C
• Radiation signalsC

Based on 3 census tracts · compiled September 10, 2026 · how each grade works and its sources

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