In the beginning of the 21st century, we find ourselves awakening to a water crisis. The signs are everywhere. From deaths attributed to waterborne diseases and lack of water to economic losses due to poor environmental planning, the evidence is building. Because water touches our lives in so many ways, each of us must understand its importance -- particularly health professionals, who may be more impacted by issues of water than they realise. Dr Magee examines the many nuances of water in our lives -- including its impact on health, energy, cities, industry and economies. His discussion of natural water disasters touches on many of the core problems raised by the tragedy of Hurricane Katrina.