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Atrazine Simazine

There are waters impaired for public water supply use due to atrazine and/or simazine. These waters are classified as high priority for TMDL development. The IEPA Planning Unit will develop atrazine and/or simazine TMDLs for waters that have previously approved watershed TMDLs for other parameters. The map below displays all the waters for TMDL development. Information from the previous TMDL stage one report will be utilized for the TMDL reports. This information includes watershed characterization such as landuse and tillage information.

Lakes will have TMDLs developed using the loading capacity approach. The loading capacity analysis will be based on the lake capacity and the MCL of 3 ug/L for atrazine and 4 ug/L for simazine. Streams will have TMDLs developed using the loading curve approach. The loading curve analysis will be based on the flow information from the river and the MCL.

There are four stream segments impaired for atrazine and one for simazine. Three lakes are impaired for atrazine, five for simazine and two for both pesticides. The following table contains information on the waterbody and impairment.

Waterbody Impairments
Spring Lake Atrazine
Hillsboro Old Lake/Glenn Shoals Lake Atrazine
Carlinville Lake Atrazine
Salem City Reservoir Simazine
Lake Mattoon/Lake Paradise Simazine
Nashville City Reservoir/Washington County Lake Atrazine and Simazine
North Fork Vermilion River Atrazine
East Fork Kaskaskia River/Farina Lake Simazine
Shoal Creek Atrazine
Skillet Fork Atrazine

A public meeting will be held in each watershed. A public notice will be sent approximately 30 days prior to the meeting. The public comment period will end thirty days after the meeting. A total of eighteen TMDLs (eleven atrazine and seven simazine) will be sent to USEPA for approval for the 2014 year.

For more information, contact Abel Haile (Planning Unit) at (217) 782-3362.

Atrazine and Simazine Websites

United States Environmental Protection Agency (USEPA)

Federal Insecticide, Fungicide and Rodenticide Act (FIFRA) Scientific Advisory Panel (SAP)

This panel serves as the primary scientific peer review mechanism of the Environmental Protection Agency (EPA), Office of Pesticide Programs (OPP), and it structures to provide balanced expert assessment of pesticide and pesticide-related matters facing the Agency.

Agency for Toxic Substances and Disease Registry (ATSDR)

The ATSDR is a federal health agency of the U.S. Department of Health and Human Services. They serve the public by using best science, taking responsive public health actions, and providing trusted health information to prevent harmful exposures and diseases related to toxic substances.

United States Geological Survey (USGS)