Carroll County, MD

ZIP 21158

In ZIP 21158, 7 of the 12 things we check have at least one part graded D or F.

• Drinking water: City Of Westminster has 2 contaminants at or over an EPA legal limit; 23 contaminants are above health goals, led by pfos at 5.5× California’s Public Health Goal.
• Nearest Superfund site: Keystone Sanitation Landfill, 2.9 miles away.
• Largest share of modeled toxic air from industry: Elite Spice Inc. (36%), mostly ethylene oxide.
• Fine particles (PM2.5) average 7.7 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 164,787 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 21158

• Superfund sites nearbyA to D
• Factories and industrial sitesB
• Oil and gas wellsA
• Parks and nature nearbyC to D
• Air qualityB to C
• Drinking water qualityC to F
• Pesticide useF
• Neighborhood health statusB to D
• Past wildfire impactsA
• Past flood impactsB
• Noise levelsA to D
• Radiation signalsF

Based on 9 census tracts · compiled September 10, 2026 · how each grade works and its sources

Loading the full report, with every source…