King County, WA Swimming Pools & Spas: Safety Rules (2026)

Swimming pool safety in King County combines state building code adoption and Department of Health oversight for public pools. Residential pools in unincorporated King County follow the Washington State Building Code (RCW 19.27) which adopts the International Residential Code (IRC) Appendix G or International Building Code (IBC) Chapter 31 for pool barriers. Any pool, hot tub, or spa with water more than 24 inches deep requires a barrier at least 48 inches high measured from the outside. Barriers must have no openings allowing a 4-inch sphere to pass through, no hand or foot holds on the exterior allowing climbing, and gates that are self-closing and self-latching with latch hardware at least 54 inches above the ground. Residential alarm systems are encouraged. For pools and spas that use the dwelling itself as part of the barrier, doors from the house to the pool area must have alarms or self-closing self-latching hardware. Suction entrapment hazards must be addressed through dual drains or anti-vortex covers (Virginia Graeme Baker Pool and Spa Safety Act federal requirements). Public pools, hot tubs, and water recreation facilities (apartment complexes, HOAs, hotels) are regulated by Seattle-King County Public Health under WAC 246-260 Water Recreation Facilities. Operator training, water quality testing, disinfection, lifeguards (certain facilities), and first aid requirements apply. Public pools must be inspected before opening and at least annually. Drowning is a leading cause of death for children under 5 in Washington — King County Public Health promotes Pool Safely campaign and layers of protection. HOAs often have additional pool rules. Fence permits may be required under KCC 16.