RCW 47.38.050: Recreational vehicle sanitary disposal systems.

The department of transportation shall construct and maintain recreational vehicle sanitary disposal systems in the following safety rest areas lying along highways which are a part of the interstate highway system: (1) Gee Creek safety rest area, northbound and southbound on Interstate 5 in Clark county; (2) SeaTac safety rest area, northbound on Interstate 5 in King county; (3) Silver Lake safety rest area, southbound on Interstate 5 in Snohomish county; (4) Winchester Wasteway safety rest area, eastbound and westbound on Interstate 90 in Grant county; (5) Sprague safety rest area, eastbound on Interstate 90 in Lincoln county; (6) Selah Creek safety rest area, northbound and southbound on Interstate 82 in Yakima county; (7) Indian John Hill safety rest area, eastbound and westbound on Interstate 90 in Kittitas county; (8) Smokey Point safety rest area, northbound and southbound on Interstate 5 in Snohomish county; (9) Schrag safety rest area, westbound on Interstate 90 in Adams county.