Oregon's Biosolids Program

Biosolids are the solids derived from primary, secondary, or advanced treatment of domestic wastewater that have been treated through one or more controlled processes to significantly reduce pathogens and reduce volatile solids or chemically stabilize solids to the extent that they do not attract vectors.  These solids are treated to meet state and federal requirements that allow for their beneficial use in land application activities.  Biosolids are also referred to as treated sewage sludge.  The land application of biosolids is regulated through biosolids management plans that are reviewed and approved by DEQ, and through detailed site authorization letters issued by DEQ. 

• Biosolids Program Overview
  Program description including regulations and policy, resources, compliance assurance, and beneficial use through land application.
   
• Fact Sheet - Biosolids: A Beneficial Resource PDF
  General information on biosolids as a beneficial resource.
   
• Biosolids Program Internal Management Directive (IMD) PDF
  Comprehensive guidance for specific federal and state requirements pertaining to program implementation.