Richland County, MT

ZIP 59221

In ZIP 59221, 4 of the 12 things we check have at least one part graded D or F.

• Drinking water: Sidney City Of meets every EPA legal limit; 9 contaminants are above health goals, led by lead at 32× 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: Watford City Plant (43%), mostly benzene.
• Fine particles (PM2.5) average 6.3 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 164,068 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 59221

• Superfund sites nearbyA
• Factories and industrial sitesA to B
• Oil and gas wellsD to F
• Parks and nature nearbyC
• Air qualityA
• Drinking water qualityD to F
• Pesticide useF
• Neighborhood health statusC
• Past wildfire impactsA to C
• Past flood impactsA
• Noise levelsA
• Radiation signalsD

Based on 4 census tracts · compiled September 10, 2026 · how each grade works and its sources

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