Biosolids Applied to Land: Advancing Standards and Practices

In this report, biosolids are defined as sewage sludge that has been treated to meet the regulatory requirements for land application set out in the Code of Federal Regulations, Title 40 (Part 503). The U.S. Environmental Protection Agency (EPA) established the Part 503 rule and is responsible for overseeing the national biosolids program. The land-application requirements include concentr…