Welcome to the GLI Toxicity Data Clearinghouse.

The GLI (Great Lakes Initiative) Toxicity Data Clearinghouse is a central location for information on criteria, toxicity data, exposure parameters and other supporting documents used in developing water quality standards in the Great Lakes Watershed.

The Clearinghouse contains information relevant to regulatory and non-regulatory programs. It can be used to help establish water quality criteria, permit discharge limits, Total Maximum Daily Loads, Remedial Action Plans, and Lakewide Management Plans within the Great Lakes Basin. In particular, States and Tribes can use the Clearinghouse to help derive criteria for pollutants without specific numeric criteria published in 40 CFR Part 132 of the GLI. The target audience for the Clearinghouse is State and Tribal environmental agencies in the Great Lakes basin, as well as other interested parties with a technical background.
 

The key pages of this website are:

• Download the Clearinghouse - Download the Clearinghouse Access database and PDF help files. You will then be able to search for water quality criteria by chemical, designated use, and agency. The results include links and/or downloadable spreadsheets for associated toxicity data and exposure parameters
  
  - Chemical List: Chemicals currently available in the database.
  - Data Field Lists: Description of data fields included in the Clearinghouse
   
• GLI Documents - Download customized spreadsheets that walk you through calculating water quality criteria and values under GLI. Also find regulations and technical support documents for the GLI.
   
• GLI States & Tribes - Get contact information on all GLI States and Tribes, as well as links to their websites.

The Clearinghouse relies on State environmental agencies to provide data, usually in the form of water quality standards fact sheets, to EPA. The Clearinghouse data was last updated March 2011 (see Recent Additions) and contains data provided by Indiana, Minnesota, New York, Ohio, and Wisconsin. While Michigan chose not to provide facts sheets, you can contact MDEQ directly (see GLI States & Tribes) to obtain them. Illinois and Pennsylvania do not have fact sheets for their Great Lakes basin waters, as these two States have limited numbers of discharges to such waters. Should the need arise for water quality criteria, these states may choose to generate criteria according to their regulations and in that event fact sheets may be available.The Clearinghouse will be updated as States and Tribes revise or adopt new criteria and provide data to EPA; however there may be a lag between the publication of new or revised criteria and the uploading of new data into the Clearinghouse.

The GLI Clearinghouse is essentially a central access point for available data; it should not be considered an official site for State/Tribal criteria or supporting information. Users interested in official information should refer to the original State documents or contact the State/Tribal agency directly.

Additional information about Water Quality Monitoring and Standards can be found at the following sites: