Lewis and Clark County, MT

ZIP 59636

In ZIP 59636, 3 of the 12 things we check have at least one part graded D or F.

• Drinking water: Broadwater Estates Hoa meets every EPA legal limit; 10 contaminants are above health goals, led by lead at 10× California’s Public Health Goal.
• Nearest Superfund site: Upper Tenmile Creek Mining Area, 6.0 miles away.
• Largest share of modeled toxic air from industry: American Chemet Corp (88%), mostly copper compounds.
• Fine particles (PM2.5) average 5.7 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 26,812 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 59636

• Superfund sites nearbyF
• Factories and industrial sitesB
• Oil and gas wellsA
• Parks and nature nearbyB
• Air qualityA
• Drinking water qualityD
• Pesticide useD
• Neighborhood health statusC
• Past wildfire impactsA
• Past flood impactsA

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

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