A residential pool, spa, or hot tub in unincorporated Benton County must be enclosed by a barrier at least 48 inches high, with no opening a 4-inch sphere can pass and gates that self-close and self-latch, under the 2021 ISPSC adopted through WAC 51-51.
Benton County enforces the barrier rules of the 2021 International Swimming Pool and Spa Code, referenced by Section R327 of the state building code (WAC 51-51). The barrier must stand at least 48 inches above grade measured on the side facing away from the pool, with the gap under it no more than 2 inches over grass or gravel. Openings must not pass a 4-inch sphere, and there can be no climbable handholds or footholds. Pedestrian gates must open away from the pool, self-close, and self-latch, with the release at least 54 inches high or shielded on the pool side. A dwelling wall may form part of the barrier with alarmed or self-closing doors.
A barrier under 48 inches, an opening a 4-inch sphere passes through, or a gate that is not self-closing and self-latching fails inspection, and the pool may not be used until corrected.
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