(1) The following types of real property shall be exempt from annual service charges:
(a) Real property that is owned by, and is the personal residence of, a person or persons approved by the county assessor for a senior citizen or disabled persons property tax exemption under RCW 84.36.381.
(b) Real property that is owned by a "public benefit nonprofit corporation," as defined by RCW 24.03.490, and is used as a cemetery, provided the real property does not discharge storm water off site through constructed conveyance facilities and a 50-foot vegetated buffer is maintained on the property along any water body that drains to a fish bearing stream or lake.
(2) The rate charged for right-of-way owned by the state shall be 30 percent of the rate for comparable real property in terms of impervious surface coverage, or as otherwise provided by RCW 90.03.525.
(3) Service charges imposed on rights-of-way owned by the county or municipalities under authority of chapter 36.89 RCW shall be at the same rate as the rate for comparable real property in terms of impervious surface coverage, except that the director may determine that up to 70 percent of the amount due can be paid through in kind services, as provided in RCW 36.89.085. In kind services include, but are not limited to, the construction, operation, and maintenance of storm and surface water management facilities designed to control surface water or storm water runoff.
(4) The rate charged for real property with a commercial rainwater harvesting system shall be reduced from the rate set out in this chapter by a fraction equal to the storage volume of the rainwater harvesting system divided by the mean annual runoff volume generated by the total impervious surface area of the property. (Added by Amended Ord. 15-069, Nov. 16, 2015, Eff date Jan. 1, 2016).