This new edition is structured as before. It begins by covering the long-established systems of private water rights (the appropriation doctrine and the riparian doctrine for surface waters and the various doctrines for groundwaters). Then it covers public rights, water quality regulation, and other environmental regulation primarily from the perspective of how these affect private water rights. The book addresses water distribution organizations, interstate allocation, and federal-state relations. There are some new principal cases in certain chapters. The notes in all the chapters have been extensively rewritten for brevity and have been updated. More international coverage has been added to the book.