An above-ground pool holding water over 24 inches deep needs a Benton County building permit and must meet the 2021 ISPSC barrier rules, though a pool wall at least 48 inches high can itself serve as the barrier.
Benton County treats an above-ground pool holding water over 24 inches deep as a regulated pool under the 2021 building code (WAC 51-51, Section R327), so the permit and barrier requirements both apply. The pool's own wall can act as the barrier when it stands at least 48 inches above grade around the entire perimeter with no exterior handholds or footholds, and the manufacturer allows it. Any ladder or steps must be removable, lockable, or enclosed behind their own compliant barrier. Electrical connections need GFCI protection and NEC bonding, permitted through Washington State L&I. Drainage must not spill onto neighboring property. Temporary pools 24 inches deep or less are generally exempt.
Leaving a climbable ladder on an above-ground pool, or a wall under 48 inches without a separate barrier, fails inspection. Building over 24 inches deep without a permit draws doubled fees.
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See how Benton County's above-ground pools rules stack up against other locations.
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