(1) Within service areas established pursuant to chapter 43.20 or 70A.100 RCW, the department of ecology and the department of health shall coordinate approval procedures to ensure compliance and consistency with the approved water system plan or small water system management program.

(2) The effect of the department of health's approval of a planning or engineering document that describes a municipal water supplier's service area under chapter 43.20 RCW, or the local legislative authority's approval of service area boundaries in accordance with procedures adopted pursuant to chapter 70A.100 RCW, is that the place of use of a surface water right or groundwater right used by the supplier includes any portion of the approved service area that was not previously within the place of use for the water right if the supplier is in compliance with the terms of the water system plan or small water system management program, including those regarding water conservation, and the alteration of the place of use is not inconsistent, regarding an area added to the place of use, with: Any comprehensive plans or development regulations adopted under chapter 36.70A RCW; any other applicable comprehensive plan, land use plan, or development regulation adopted by a city, town, or county; or any watershed plan approved under chapter 90.82 RCW, or a comprehensive watershed plan adopted under RCW 90.54.040(1) after September 9, 2003, if such a watershed plan has been approved for the area.

(3) A municipal water supplier must implement cost-effective water conservation in accordance with the requirements of RCW 70A.125.170 as part of its approved water system plan or small water system management program. In preparing its regular water system plan update, a municipal water supplier with one thousand or more service connections must describe: (a) The projects, technologies, and other cost-effective measures that comprise its water conservation program; (b) improvements in the efficiency of water system use resulting from implementation of its conservation program over the previous six years; and (c) projected effects of delaying the use of existing inchoate rights over the next six years through the addition of further cost-effective water conservation measures before it may divert or withdraw further amounts of its inchoate right for beneficial use. When establishing or extending a surface or ground water right construction schedule under RCW 90.03.320, the department must take into consideration the public water system's use of conserved water.

Severability—2003 1st sp.s. c 5: See note following RCW 90.03.015.