A recent report by the Minnesota Pollution Control Agency found an interesting array of chemicals (such as DEET, cocaine, and antidepressants) present in Minnesota lakes. According to MPR, traces of the insect repellant were found in roughly 76 percent of lakes, while cocaine and antidepressants were found in about 30 percent of lakes.

While you shouldn’t expect to get high going for a dive this summer, these trace amounts of chemicals can have serious consequences on aquatic life. As MPR reports, research has found that “low levels of contamination cause behavioral changes in baby fish that make them less likely to survive.” An easy way to start detox-ing our lakes? Avoid dumping chemicals down the drain. To clear up what’s already there, however, could be costly. The STrib points to reverse osmosis technology treatments that cost upwards of a million bucks per plant.