Since 2006, our Persistent, Bioaccumulative, and Toxics (PBT) Monitoring Program has studied PBT chemical trends by collecting sediment cores annually at three lakes. We choose new lakes each year to achieve a broad spatial coverage of the state and to target waterbodies based on the parameters to be analyzed.
We collect a single sediment core from the lakes to construct historical deposition profiles of chemicals in the environment. Selected lakes cover a range of potential contaminant sources.
The information is used by policy makers to support the development of chemical action plans and agency toxics reduction strategies. Chemicals studied include lead, mercury, and organic contaminants, such as flame retardants and perfluoroalkyl substances.