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Medications Among the Chemicals Found in MN Lakes and Streams

pillsThe Minnesota Pollution Control Agency (MPCA) released the results of a study that confirms that lakes and streams across the State are contaminated by a variety of pharmaceuticals, ingredients from personal care products, and endocrine-disrupting compounds. The MPCA says even in remote areas, chemicals such as antibiotics, antidepressants, and drugs to control diabetes, cholesterol, and blood pressure were detected. The insect repellent DEET was also detected in 91 percent of the lakes studied. The MPCA says the results are consistent with previous studies of Minnesota lakes and rivers.

“We have known for some time that these compounds frequently turn up downstream from wastewater treatment plants,” says Mark Ferrey, the MPCA study's lead author. “And recent research has shown that a surprising number are found even in remote lakes or upstream waters. But we have a lot to learn about how they end up there.” Ferrey noted that septic systems and stormwater runoff are among the potential sources of contamination to surface water not impacted by wastewater treatment plants. While it is not yet clear how these compounds are entering more remote lakes and streams, Ferrey noted that it is possible that these contaminants are sometimes being distributed by rainfall or atmospheric transport of dust to which these chemicals are attached.

The MPCA study tested 11 lakes and four streams that were previously sampled for the presence of 125 different compounds — mostly pharmaceutical products, but also some ingredients that are used in cosmetics, detergents and hygiene products. Some of the compounds were included in a 2008 round of testing, but the most recent report tested for many new chemicals. The MPCA indicates this study was the first in Minnesota to look for the x-ray contrast drug iopamidol, which was found in 73 percent of the lakes studied. “We know more now than we have in the past about what contaminants consistently show up in surface water,” says Ferrey. “And we’re also beginning to better understand how these contaminants can affect fish and other organisms in the environment.”

Research into how these compounds might affect human health through long-term, low-level exposure is still in its early stages. The MPCA works with the Minnesota Department of Health in evaluating potential human health impacts from these chemicals. Ferrey noted that it is especially difficult to predict environmental and health effects of exposure to multiple pharmaceuticals in combination.

Because some pharmaceutical contamination of surface water is due to wastewater, the MPCA advises that people avoid flushing unwanted medicines down the toilet. Better alternatives include taking the drugs to a medication collection site, or mixing them with vinegar or cat litter to discourage ingestion and throwing them in the trash in a sealed container. Special recommendations apply to liquid chemotherapy drugs. Efforts should be made to encourage people to discuss medication and product disposal options with local utilities, watershed management organizations, or pharmacists.

The MPCA's full report can be accessed by clicking here.




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