In the period 2015-2018, the City of Cape Town experienced a sustained drought that eventually reduced the city’s usable reserves to 10% of capacity. Fortunately, there were individual water meters in many homes, and as part of the city’s response to the water crisis, it was able to implement increasingly stringent water restrictions, using both price (higher water tariffs) and quantity (lower water pressure and legislated constraints on daily use by households).

Cape Town made world headlines in 2018 as a major city on the brink of seeing its taps run dry. Its predicament drew attention to the challenge that water scarcity presents for cities in the 21st century. Globally, over four billion people face severe freshwater shortages and this number is expected to rise (Mekonnen and Hoekstra, 2016). The Water Resources Group (2017) predicts that by 2030 there will be a 40% gap between freshwater supply and demand if business-as-usual water management continues.