Ada County, ID

ZIP 83720

In ZIP 83720, 5 of the 12 things we check have at least one part graded D or F.

• Drinking water: Garden City Water And Sewer System has 1 contaminant at or over an EPA legal limit; 15 contaminants are above health goals, led by pfos at 20× 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: Marathon Pipe Line LLC Boise (Station) Id (40%), mostly chromium.
• Fine particles (PM2.5) average 8.5 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 84,470 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 83720

• Superfund sites nearbyA
• Factories and industrial sitesA
• Oil and gas wellsA
• Parks and nature nearbyD
• Air qualityD
• Drinking water qualityF
• Pesticide useC
• Neighborhood health statusB
• Past wildfire impactsD
• Past flood impactsA
• Noise levelsC
• Radiation signalsD

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

Loading the full report, with every source…