Follow-Up Samples from the Illinois River Show No Microcystins
Press release: Follow-up samples collected in the Illinois River last week showed no evidence of the algal toxin, microcystin, including samples collected near Hennepin and Marseilles. Previous samples collected at these locations detected microcystins above the 4 parts per billion (ppb) draft health advisory established by U.S. EPA. It is likely that heavy rains received in northern Illinois contributed to the improved conditions in the river.