Troutdale, OR Swimming Pools & Spas: Hot Tub Rules (2026)

Hot tubs, spas, and swim spas in Multnomah County are regulated primarily through the Oregon Electrical Specialty Code (OAR 918-305) and Oregon Residential Specialty Code (OAR 918-480). An electrical permit is required for installation of the 50A 240V circuit typical for portable hot tubs — this is a $150-$250 permit in both Multnomah County Building Division and Portland BDS. GFCI protection is mandatory under NEC 680.41 and a readily accessible disconnect must be within sight and at least 5 feet from the tub. If the spa holds water deeper than 24 inches, it meets the ORSC definition of 'pool' and must comply with Appendix G barrier requirements (48-inch fence, self-closing gate). However, ORSC Appendix G allows a lockable safety cover compliant with ASTM F1346 to substitute for perimeter fencing on a hot tub — this is the most common approach. Setbacks follow zoning: Portland R-5 and R-7 zones require 5 ft side and rear setbacks for accessory structures; unincorporated Multnomah County EFU and rural residential typically require 10 ft. Drainage from the tub must be directed to a private sewer cleanout or approved drywell; discharge to storm drains is prohibited under Portland BES rules and federal Clean Water Act. Decks supporting hot tubs require engineered design — a 400-gallon hot tub with water and occupants weighs 5,000+ lbs. Indoor installations require per-NEC 680 bonding and ventilation per ORSC mechanical code.