The privatization of water supply and wastewater systems, together with institutional restructuring of governance – through decentralization and the penetration of global firms in local and regional markets – have been promoted as solutions to increase economic efficiency and achieve universal water supply and sanitation coverage. Yet a significant share of service provision and water resources development remains the responsibility of public authorities. The chapters in this book – with case evidence from Argentina, Chile, France, the USA, and other countries – address critical questions that dominate the international agenda on public versus private utilities, service provision, regulations, and resource development. This book presents varied perspectives – largely complementary but at times contrasting – on public and private governance of water. Public authority in general is being reasserted over service provision, while resource development and investments in infrastructure continue as a mix of public and private initiatives. But more important, increased oversight and regulation of market-based initiatives that until recently were touted as panaceas for water supply and sanitation are increasingly being reconsidered on the basis of social equity, environmental, and public health concerns. This book was based on the special issue of Water International.