We've known for some time that neonicotinoids — the class of systemic, bee-harming insecticides — are water soluble. They've been detected in surface water in several agriculture-heavy states. And now they're showing up in Midwestern waters.
Last month, the U.S. Geological Survey released a report finding clothianidin, one of the most widely used neonics, in 75% of Midwest streams surveyed. Other common neonics were detected too. Not good news.