In 2013, the Iowa Geological and Water Survey published a "Survey of Iowa Groundwater and Evaluation of Public Well Vulnerability Classifications for Contaminants of Emerging Concern". The most commonly found contaminant was pesticides in 41% of samples, with as many as 6 pesticide compounds together, and mostly chloroacetanilide degradates. Glyphosate was not detected, and its metabolite was only detected in two of 60 wells (3%) at the detection limit of 0.02 μg/L. In 35% of 63 samples pharmaceutical compounds were found. Of the 14 drugs, six were above the method reporting limit, the highest of which was acetaminophen. One in five of the wells contained microorganisms,