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.
|Hillsboro Old Lake/Glenn Shoals 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|
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)
- Basic Information about Atrazine in Drinking Water
- Basic Information on Simazine in Drinking Water
- Atrazine Reregistration Website
- Simazine Reregistration Website
- Simazine Reregistration Eligibility Decision
- Atrazine Updates
- 2003- 2006. Decision Documents for Atrazine
Includes the Atrazine Interim Reregistration Eligibility Decision (IRED) (January 2003), Revised Atrazine IRED (October 2003) and the Finalization of Atrazine IRED and Completion of Tolerance Reassessment and Reregistration Eligibility Process (April 2006).
- March 28, 2006. Cumulative Risk Assessment from Triazine Pesticides
Health Effects Division (HED) Human Health Risk Assessment in Support of the Reregistration Eligibility Decisions for Atrazine, Simazine and Propazine
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.
- October 26, 2011. Federal Insecticide, Fungicide and Rodenticide4 Act (FIFRA) Scientific Advisory Panel (SAP) meeting minutes of the Meeting held July 26-28, 2011 on the Re-evaluation of the Human Health Effects of Atrazine: Review of Non-cancer Effects, Drinking Water Monitoring Frequency and Cancer Epidemiology
- September 11, 2012. FIFRA SAP meeting minutes of the Meeting held June 12-14, 2012 on the Scientific Issues Associated with “Problem Formulation for the Reassessment of Ecological Effects from the Use of Atrazine”
- More FIFRA SAP documents on the reregistration website
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.
- The Toxic Substances Portal for Atrazine has information on atrazine such as the public health statement and the toxicological profile for atrazine.
- Interaction Profiles for Toxic Substances: Atrazine, Deethylatrazine, Diazinon, Nitrate and Simazine
United States Geological Survey (USGS)
- The National Water-Quality Assessment (NAWQA) Program Pesticide Synthesis Project is a national-scale assessment of the occurrence and behavior of pesticides in streams and groundwater and the potential for pesticides to adversely affect drinking water supplies or aquatic ecosystems. This includes estimated agricultural use maps for atrazine and simazine.
- Watershed Regressions for Pesticides (WARP) Atrazine Model
- Method for Estimating Annual Atrazine Use for Counties in the Conterminous United States, 1992-2007
- Measured Atrazine in Streams