Pool Barrier

What governs a pool barrier in Arizona is a state statute, not a building code. A.R.S. 36-1681 reaches any contained body of water 18 inches or more deep at any point and wider than 8 feet at any point that is meant for swimming, so a spa or a large water feature can trigger it along with a pool.

The dimensions are exact. The barrier stands at least 5 feet tall, measured on the exterior side, the face turned away from the water. No opening may pass a 4-inch sphere. Wire mesh or chain link is capped at a 1.75-inch mesh measured horizontally. The outside face cannot carry openings, handholds, or footholds a child could climb, and the barrier has to sit at least 20 inches back from the water's edge. An above-ground pool counts as its own barrier only if its sides are non-climbable and at least 4 feet high, with a removable or secured ladder.

That 5-foot number is where Arizona parts ways with the model code. The International Swimming Pool and Spa Code, which the residential code points to for pools, sets its barrier at 48 inches. Arizona's statute sets 60 and applies statewide, whether or not your city ever adopted a pool code. Where the two differ, the statute governs. A city or county may go stricter, never lower.

For example, on unincorporated Maricopa County land the county puts the top of the barrier at 60 inches above finished grade on the exterior side, and the barrier permit has to be issued before you install the fence, plaster the pool, or add water. That timing is the trap. A barrier is not a punch-list item.

The statute exempts a residence where every resident is at least six years old, along with pools built before the law took effect. We price the barrier with the pool, because on a new build it is never optional.