A pool, spa, or hot tub in unincorporated Boulder County must be enclosed by a barrier meeting 2021 ISPSC Section 305. The barrier must be at least 48 inches high measured from the outside, with no gaps a 4-inch sphere can pass, and any gate must be self-closing and self-latching.
Boulder County adopts the 2021 International Swimming Pool and Spa Code, whose Section 305 governs residential barriers. A barrier is "A permanent fence, wall, building wall, or combination thereof that completely surrounds the pool or spa and obstructs the access to the pool or spa." The top of the barrier must be at least 48 inches above grade measured on the side facing away from the pool. Openings must not allow passage of a 4-inch sphere, and mesh fencing must sit no more than 1 inch above grade. Pedestrian gates must open outward, be self-closing and self-latching with the latch placed to prevent a child reaching it.
An unbarriered or non-compliant pool fails inspection and cannot pass final; existing unenclosed pools are treated as an imminent drowning hazard subject to enforcement.
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