Great Lakes Open Lakes Trend Monitoring Program: Dichlorodiphenyltrichloroethane (DDT)
Based on information collected at Environment Canada monitoring locations, yearly rates drop by 6.8% in Lake Superior, 7.1% in Lake Huron, 7.5% in Lake Erie, and 7.3% in Lake Ontario. This dip seems to be in line with past rate drops. Yearly rates drop using U.S. EPA information are a little lower at 4.5% in Lake Superior, 5.9% in Lake Michigan, 5.9% in Lake Huron, 6.0% in Lake Erie, and 6.7% in Lake Ontario. Rate drops at the U.S. monitoring stations seem to be falling faster in Lakes Michigan, Huron, and Ontario compared to the past, while rates remain level with past trends in Lakes Superior and Erie.