This project investigated the decade-long Australian Millennium Drought to compile lessons learned. The information was gathered to provide California utilities and policy-makers with helpful strategies, as the state enters its fifth year of severe drought. This report was co-authored by the Institute for Sustainable Futures (ISF) at the University of Sydney, the Pacific Institute, and the Alliance for Water Efficiency. The report was jointly funded by the Metropolitan Water District of Southern California, the San Francisco Public Utilities Commission, and the Water Research Foundation. Published in 2016.