Worcester County, MA Swimming Pools & Spas: Hot Tub Rules (2026)

Hot tub and spa regulation in Worcester County mirrors pool rules under MA state codes. 105 CMR 435 (State Sanitary Code Ch. V: Swimming Pools) explicitly applies to spas and hot tubs with 24+ inches of water. 780 CMR Appendix G provides barrier requirements identical to pools (48-inch minimum barrier, self-closing/self-latching gates) with an exception: hot tubs and spas may use a locking safety cover meeting ASTM F1346-91 standards in lieu of a perimeter barrier. This is the most common approach for residential hot tubs in Worcester County. Electrical requirements under 527 CMR 12.00 and NEC Article 680 mandate a dedicated 240V/50A circuit with GFCI protection, disconnect within sight of the tub at minimum 5 ft away, and proper bonding of metallic components. An electrical permit is always required; most hot tubs also trigger a building permit for the electrical installation and potentially support structure. Deck-mounted or elevated hot tubs require structural assessment — a filled 8-person hot tub can weigh 5,000+ lbs. Indoor installations may require enhanced ventilation under 780 CMR mechanical code to manage humidity. Setbacks from property lines set by local zoning (5-10 feet typical). Wetland proximity within 100 ft triggers Conservation Commission review under MGL c. 131, §40. Discharge of chlorinated/brominated water requires dechlorination before release. Portable inflatable spas and hot tubs under 24 inches depth are generally exempt from barrier requirements but electrical still applies.