![]() ![]() Geological Survey helped fund previous studies. The most commonly detected chemical was the insect repellent DEET, found in 76 percent of the lakes. That was expected and similar to earlier, smaller studies.ĭEET’s effects on the environment at the concentrations found are “not known,” the report said.Ĭarbadox, an antibiotic approved for use only on swine, was in 28 percent of the lakes. ![]() (Wisconsin ranks 18th.)īut many of the carbadox detections were nowhere near swine or other livestock facilities, which the report called “perplexing.” Minnesota has plenty of pigs, ranking third in hog production nationwide, according to the Minnesota Department of Agriculture. ![]() †Bisphenol A (BPA), a component of plastic, in 43 percent of the lakes.Potential endocrine disruptors found in Minnesota waters included: “Whether this indicates that carbadox is being used for off-label purposes or if it is transported to lakes through unknown mechanisms is not clear,” the report said, adding that carbadox, a carcinogen, is banned in Canada and the European Union. BPA has been banned in sippy cups and baby bottles. †Triclosan, a common disinfectant often found in antibacterial hand soaps, in 14 percent of the lakes.†The hormone androstenedione, a precursor to estrogen and testosterone that is sometimes taken as a hormone supplement known as “andro,” in 30 percent of the lakes.†Nonylphenol, a byproduct of commonly used surfactants that acts like estrogen on lab animals, in 10 percent of the lakes.It was originally developed as an estrogen. It has been found to break down into dioxins in surface waters they can be highly toxic at tiny concentrations.Īntidepressants were commonly found in lakes, streams and rivers at concentrations that can change fish reproductive and predator-response behaviors. ![]()
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