A hot tub earns the one real break in Harford County's pool code. A spa fitted with a lockable safety cover meeting ASTM F1346 is excused from the barrier rules, so no 48-inch fence is required around it.
Under the 2021 International Swimming Pool and Spa Code enforced by Harford County, Section 305 exempts a spa or hot tub equipped with a lockable safety cover complying with ASTM F1346 from the barrier provisions of Sections 305.2 through 305.7. That load-rated cover stands in for a fence, which is why most Harford hot tubs sit on a deck without an enclosure. The tub still needs an electrical and often a building permit, because its 240-volt connection must be bonded, GFCI-protected, and inspected. Without a compliant cover, the spa is treated like a pool and the 48-inch barrier applies.
Running a hot tub with no ASTM F1346 cover and no barrier violates the code, because the spa then falls under the pool barrier rules. Unbonded spa wiring fails the electrical inspection.
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