Wash. Rev. Code § 90.74.020
(1) Project proponents may use a mitigation plan to propose compensatory mitigation within a watershed. A mitigation plan shall:
(2)
(3) When making a permit or other regulatory decision under the guidance of this chapter, the departments of ecology and fish and wildlife shall consider whether the mitigation plan provides equal or better biological functions and values, compared to the existing conditions, for the target resources or species identified in the mitigation plan. This consideration shall be based upon the following factors:
[ 2012 c 62 s 4; 1997 c 424 s 3.]