Washington Revised Code Title 70. Public Health and Safety § 70.90.250. Application of chapter

(1) Any water recreation facility for the sole use of residents and invited guests at a single-family dwelling;

(2) Therapeutic water facilities operated exclusively for physical therapy;

(3) Steam baths and saunas; and

(4) Inflatable equipment operated at a temporary event, including inflatable water slides, that do not allow water to pool more than six inches and do not recirculate water.