An official website of the United States government.

This is not the current EPA website. To navigate to the current EPA website, please go to This website is historical material reflecting the EPA website as it existed on January 19, 2021. This website is no longer updated and links to external websites and some internal pages may not work. More information »

Lake Michigan Mass Balance Results and Publications

The Lake Michigan Mass Balance Study measured and modeled the concentrations of representative pollutants within important compartments of the Lake Michigan ecosystem. Objectives of the study were to:

  • Estimate pollutant loading rates,
  • Establish a baseline to gauge future progress
  • Predict the benefits associated with load reductions, and
  • Further understand ecosystem dynamics.
You may need a PDF reader to view some of the files on this page. See EPA’s About PDF page to learn more.