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.

Support for this project was provided by American Water Works Association Research Foundation under Award Number 3043, the WateReuse Foundation under Award Number WRF-04-001, the U.S. Geological Survey under Award Number 04HQAG0171, the CALFED Bay-Delta Program and the California Department of Water Resources Conjunctive Water Management Branch, the City of Phoenix, the Inland Empire Utilities Agency, the Sanitation Districts of Los Angeles County, the Chino Basin Watermaster, the Water Replenishment District of Southern California, the National Science Foundation under Award Number BES-043406, and the National Research Council President's Committee of the National Academies. Any opinions, findings, conclusions, or recommendations expressed in this publication are those of the author(s) and do not necessarily reflect the views of the organizations or agencies that provided support for the project.

Library of Congress Control Number: 2007943741