Researchers are examining the threats posed to Lake Superior by new chemicals from prescription drugs that people flush down the drain. Danielle Kaeding reports.

They act similarly to the banned pesticide DDT, and they’re commonly found in pharmaceuticals or detergents. Polybrominated diphenyl ethers or PBDEs and chlorinated chemical compounds are making their way into Lake Superior. The chemicals can feminize male fish, altering their ability to reproduce. Matt Hudson of the Great Lakes Indian Fish and Wildlife Commission says the chemicals are a growing problem in the Great Lakers. “We’re seeing increasing concentrations in the environment and also the fact that they’re being found in the polar regions of the earth is showing that they’re being transported via the atmosphere like traditional legacy pollutants.” Hudson says a list of chemicals has been developed to help single out which ones are affecting the lake most. “From an initial list of 22,000 chemicals, it’s been whittled down to about 400 now of probable substances that we should really be taking a closer look at. Further screening is going to identify some top candidates for further surveillance and monitoring in the Great Lakes region.” Hudson hopes business and industries will help prevent more pollution by using green chemistry. “Green chemistry is the idea of using chemistry as a pollution prevention tool, so designing chemicals to be less hazardous when they get out into the environment.” Hudson says everyone can do their part to keep the Great Lakes healthy. “Don’t flush your pharmaceuticals, flushing them will send them right out into the lake. Making your own cleaning products, buying things in bulk and using old standbys like vinegar, ammonia and bleach work pretty well. You end up saving money.” He spoke at a three day conference in Duluth about Lake Superior.

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