(1) Every special district must use the assessed value applicable to forestland, farm and agricultural land, or open space land, under chapter 84.33 or 84.34 RCW, when the land has been designated as such and the assessed value is used as a component in determining the district assessment.

(2) If a district uses a fractional amount of assessed value as a component in determining the district assessment, then a fractional amount of the value applicable to forestland, farm and agricultural land, or open space land, under chapter 84.33 or 84.34 RCW, shall be used.