Swimming Pool and Spa Code 2018 of Washington
International Swimming Pool and Spa Code 2018 (ISPSC 2018)
Section 3109 Swimming Pools, Spas and Other Water Recreation Devices of the 2018 Washington State Building Code addresses that:
"The design and construction of swimming pools, spas and hot tubs shall comply with the International Swimming Pool and Spa Code where the facility is one of the following:
- For the sole use of residents and invited guests at a single-family dwelling;
- For the sole use of residents and invited guests of a duplex owned by the residents; or
- Operated exclusively for physical therapy or rehabilitation and under the supervision of a licensed medical practitioner.
All other "water recreation facilities" as defined in RCW 70.90.110 are regulated under chapters 246-260 and 246-262 WAC."