High Priority Public Water Supply TMDLs Impaired for Atrazine and 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.

Impaired Watersheds Map

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.

TMDL Report Statuses

WaterbodyImpairments
Spring LakeAtrazine
Hillsboro Old Lake/Glenn Shoals LakeAtrazine
Carlinville LakeAtrazine
Salem City ReservoirSimazine
Lake Mattoon/Lake ParadiseSimazine
Nashville City Reservoir/Washington County LakeAtrazine and Simazine
North Fork Vermilion RiverAtrazine
East Fork Kaskaskia River/Farina LakeSimazine
Shoal CreekAtrazine
Skillet ForkAtrazine

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

Atrazine Settlement Fund Information

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)