1988 National Sewage Sludge Survey
The U.S. Environmental Protection Agency conducted the National Sewage Sludge Survey (NSSS) in 1988 to obtain a current and reliable database on sewage sludge quality and management that could be used to help develop the final Part 503 rule. The NSSS included an analysis of 412 analytes in samples of sewage sludge from 180 publicly owned treatment works (POTWs) as well as analysis of questionnaire information on use or disposal practices from 475 POTWs with secondary or more advanced wastewater treatment.