An official website of the United States government.

Due to a lapse in appropriations, EPA websites will not be regularly updated. In the event of an environmental emergency imminently threatening the safety of human life or where necessary to protect certain property, the EPA website will be updated with appropriate information. Please note that all information on the EPA website may not be up to date, and transactions and inquiries submitted to the EPA website may not be processed or responded to until appropriations are enacted.

We've made some changes to EPA.gov. If the information you are looking for is not here, you may be able to find it on the EPA Web Archive or the January 19, 2017 Web Snapshot.

Biosolids

Control of Pathogens and Vector Attraction in Sewage Sludge

This document provides basic information about why pathogen control and vector attraction reduction in biosolids are essential for the protection of public health and the environment. Topics include:

  1. Current federal requirements under Subpart D of Part 503
  2. The different Processes to Further Reduce Pathogens (Class A) and Processes to Significantly Reduce Pathogens (Class B) processes
  3. Role of EPA's Pathogen Equivalency Committee
  4. Vector attraction reduction issues
  5. Sampling and analysis protocols used to meet the quantitative requirements of Part 503
  6. References and additional resources related to biosolids use
You may need a PDF reader to view some of the files on this page. See EPA’s About PDF page to learn more.