Benewah County, ID

ZIP 83866

In ZIP 83866, 5 of the 12 things we check have at least one part graded D or F.

• Drinking water: St Maries City Of meets every EPA legal limit; 5 contaminants are above health goals, led by arsenic at 1,293× California’s Public Health Goal.
• Nearest Superfund site: St. Maries Creosote, 9.5 miles away.
• Largest share of modeled toxic air from industry: Stimson Lumber Co Plummer Operation (63%), mostly lead compounds.
• Fine particles (PM2.5) average 6.4 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 26,324 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 83866

• Superfund sites nearbyF
• Factories and industrial sitesA
• Oil and gas wellsA
• Parks and nature nearbyC
• Air qualityA
• Drinking water qualityB to D
• Pesticide useF
• Neighborhood health statusF
• Past wildfire impactsA
• Past flood impactsA
• Noise levelsA
• Radiation signalsD

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

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