Water Use Efficiency Legislation

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What are “Water Use Efficiency Targets?”

Water use efficiency targets are set by the State, to ensure that each water supplier is using water sustainably and efficiently to support all of the key functions of daily life that depend on a reliable and safe water supply. Water suppliers will be required to stay within annual water budgets, based on these targets, for their service areas.

Why Does California Have Water Use Efficiency Targets? 

California has water use efficiency targets to ensure that water (regardless of source) is being used sustainably and that communities have the ability to withstand changing climate conditions and drought.

California is the first state in the US to adopt urban water use efficiency targets. The first targets were part of the Water Conservation Act of 2009 (SB X7-7) which required a 20% reduction in water usage by 2020.

Did the City of Davis Meet the 20% by 2020 Water Use Reduction Target?

Through the efforts of the Davis community to reduce water usage, the City of Davis met the requirements of SB X7-7 with a 2020 per capita use of 132 gallons per capita per day (gpcd). The City’s SB X7-7 reduction target was 172 gpcd. As part of the 2013 Integrated Water Resource Study, the Natural Resources Commission (NRC) set an additional 2020 per capita conservation reduction target of 134 gpcd.

gpcd graph

What Happens After 2020?

In 2018, new water conservation legislation was signed into law. This legislation (SB 606 and AB 1668) lays out a new long-term water use efficiency framework for California. The new urban water use efficiency standards are being developed by the Department of Water Resources (DWR) and the State Water Resources Control Board (SWRCB) and will establish a water use objective for each urban retail water supplier. The standards for the calculation of an agency’s water use objective have not yet been adopted by the SWRCB.

How is The Water Use Objective Calculated?

WUE Objective_No varianceThe Urban Water Use Objective is the sum of the aggregate estimates of:

  • Efficient indoor residential water use
  • Outdoor residential water use
  • Outdoor irrigation of landscape areas with dedicated irrigation meters or equivalent technology in connection with commercial, industrial, and institutional (CII) water use
  • Water losses
  • Approved variances
  • Bonus incentive (potable water reuse)

More Information on Urban Water Use Efficiency Standards and Water Use Objective