Arizona law requires that below-ground and above-ground pools must be completely enclosed by a wall, fence, or other barrier that is at least five feet high (as measured from the exterior side), and does not have any openings through which an object four inches or more in diameter could pass.
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A building permit is required for all in-ground, above-ground swimming pools, hot tubs and spas.
If you are installing a pool, a pool permit is required. The permit will cover the actual building of the pool and related electrical and plumbing work.
The CPSC recommends surrounding all pool areas with childproof fencing and gates, and that goes for above-ground pools, too. Above-ground pools have elevated edges that toddlers can't reach, but stairs and ramps that provide access to the pool's surface should be secured with gates and childproof locks.