Hot tub installations in Multnomah County require an electrical permit for the 240V circuit and must comply with Oregon Residential Specialty Code Appendix G if classified as a 'pool' (water deeper than 24 inches). A lockable ASTM F1346 safety cover may substitute for a fence on most spas. Setbacks follow underlying zoning; typical 3-5 ft from side property lines.
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.
Unpermitted electrical work: $500-$5,000 Oregon CCB penalty for contractors, stop-work for homeowners. Discharge to storm drain: Portland BES $500-$5,000 under Clean Water Act authority. Missing safety cover/barrier: correction order.
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Side-by-side rule comparisons with other cities in Multnomah County.
See how Gresham's hot tub rules rules stack up against other locations.
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