Outdoor swimming pools, decorative pools, reflecting pools and artificial fish ponds which contain 24 inches or more of water shall be protected by a fence, wall, building, enclosure or solid wall of durable material of which the pool itself may be constructed so as to afford no external handholds or footholds, of materials which are impenetrable by toddlers, and shall be at least four feet in height and equipped with a self-closing and self-latching closure mechanism not more than six inches below the top of the gate and provided with hardware for permanent locking.
N.J. Admin. Code § 5:10-6.5