1 county-level rule, plus city-specific rules for 4 cities in Snohomish County, Washington.
Verified from official government sources
Pool barriers in unincorporated Snohomish County are governed by the Washington State Building Code adopted under RCW 19.27.031, which incorporates the International Residential Code (IRC) Appendix AG (residential pool/spa barriers) and the International Building Code through WAC 51-51 (residential) and WAC 51-50 (commercial). Public and semi-public pools must additionally comply with WAC 246-260 (Department of Health Water Recreation Facilities). The baseline barrier height is 48 inches with a self-closing, self-latching gate and openings that will not pass a 4-inch sphere.
4 cities in Snohomish County have their own swimming pools & spas rules. Each link goes to that city's dedicated page with code citations.
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