NOTICE: The project that is the subject of this report was approved by the Governing Board of the National Research Council, whose members are drawn from the councils of the National Academy of Sciences, the National Academy of Engineering, and the Institute of Medicine. The members of the committee responsible for the report were chosen for their special competences and with regard for appropriate balance. This report has been reviewed by a group other than the authors according to procedures approved by a Report Review Committee consisting of members of the National Academy of Sciences, the National Academy of Engineering, and the Institute of Medicine.

Support for this project was provided by the U.S. Environmental Protection Agency Grant No. CX820717-01-0, U.S. Bureau of Reclamation Grant No. 3-FG-81-19140, U.S. Department of Agriculture Agricultural Research Service Grant No. 59-0700-4-067, U.S. Food and Drug Administration, National Water Research Institute, Water Environment Research Foundation, Association of Metropolitan Sewerage Agencies, National Food Processors Association, Eastern Municipal Water District in California, Metropolitan Water Districts of Southern California, Bio Gro Division of Wheelabrator Water Technologies, and N-Viro International Corporation.

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Cover depicts a farm field with a specialized truck for injecting sludge into the soil. A wastewater treatment plant is in the background. Art by Ellen Hill-Godfrey of Kensington, Maryland.