This study analyzed sediment samples from Aurora, Missouri for concentrations of cadmium, lead, and zinc. Mining in the area ended in 1930 but left behind mine waste piles. Remediation efforts from 2001-2006 removed the piles but metals had leached into sediments. Sample analysis found cadmium levels from 1.20 to 281.0 ppm, lead from 42.0 to 8200 ppm, and zinc from 120.0 to 20400 ppm. When compared to sediment quality guidelines, the median cadmium and zinc concentrations exceeded the threshold for probable effects. While remediation finished over 8 years ago, metal levels continue to impact stream quality and potentially threaten aquatic life.