How much do we pay to get rid of our waste? This FACT indicates the water and sewerage consumer price index for each Australian city. In other words, this index indicates the price paid for this utility, using the 2016-17 index of 100 as a base. The Australian average for water and sewerage consumer price index in 2017 was 114, meaning that populations in Australian capital cities were generally paying close to the national average. However, there are disparities in Sydney who were paying well under at 99.4, and Darwin who were paying well over at 141.2.