Periodic tap water grab samples were collected at the University of Iowa over 7 weeks in 2016 (May − July) after maize/soy planting. Clothianidin, imidacloprid, and thiamethoxam were ubiquitously detected in finished water samples at concentrations ranging from 0.24 to 57.3 ng/L. Samples collected along the University of Iowa treatment train indicate no apparent removal of clothianidin or imidacloprid, with modest thiamethoxam removal (∼50%).
NOTE: This is water collected from peoples' taps, not from the water plant exit pipe like is usually done.
Study from Environmental Science and Technology Letters.