There are a number of significant events and programmes that have influenced and changed historical water use. Events include the 1994 drought and the recession in 2008/09. Significant measures to make water use more efficient include the introduction of universal metering, volumetric wastewater charging by some Local Network Operators from the late 1990s onwards and leakage reduction. The dry 2013 summer increased water use but did not bring it anywhere near the previous consumption levels. Auckland has already come a long way in terms of reducing water use. There is still potential for more conservation.
The demand for water varies throughout the year, peaking over summer. The level of rainfall and temperature has a strong impact on how high the peak is, as shown below: