House Bill 1338, the Municipal Water Supply Bill, was approved by the Legislature in 2003. A major piece of the bill, the Water Use Efficiency Rule, was implemented by the Washington State Department of Health (DOH) in February 2007, and states that all municipal water suppliers shall set water use efficiency goals through a public process and re-evaluates those goals every six years.
The LOTT Clean Water Alliance, of which the City of Tumwater is a partner agency, initially adopted a regional conservation goal in 2006. Since adopting the regional conservation goal, LOTT and its partners have saved more than 1,000,000 gallons of water per day. For the 2013-2018 planning period, LOTT and it it’s partnering agencies have set a goal of conserving an additional 175,000-250,000 gallons of water per day.
LOTT developed this goal, in coordination with its partner cities, after extensive planning efforts examined the potential for conservation savings among the residential, commercial, institutional and industrial sectors and the costs of the various programs. LOTT’s goal represents water conservation in the frame of wastewater flow reduction, which is equal to reduction of consumer water use from the utility perspective.
The City of Tumwater’s goal, outlined in our 2010-2015 Comprehensive Water System Plan, is to incorporate outdoor water use reduction practices to go above and beyond the original 2008 goal which incorporated indoor conservation only. The combined estimated reduction based upon both indoor and outdoor conservation measures is 110,280 gallons per day by the end of the 2015 calendar year. 77,380 gallons per day will be achieved through indoor conservation measures, and is based upon Tumwater’s percentage of contribution to regional wastewater collection. The outdoor portion of our conservation goal is 32,900 gallons per day. The outdoor goal was obtained by subtracting average winter day use from average peak day use, to determine an average outdoor use of 3.29 mgd, and by applying a conservation goal of 1% to this number.