Skip to main content
U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Skip to content


  • Great Lakes Environmental Database (GLENDA)

    The Great Lakes Environmental Database (GLENDA) houses environmental data collected by EPA Great Lakes National Program Office (GLNPO) programs that sample water, aquatic life,...
  • EPA National Library Catalog

    A catalog of the holdings (i.e. books, documents, journals, etc) in all the EPA libraries. It is available to the public via In addition to being an online catalog, it...
  • Great Lakes Initiative (GLI) Clearinghouse

    The Great Lakes Initiative Toxicity Data Clearinghouse is a central location for information on criteria, toxicity data, exposure parameters and other supporting documents used...