Private residential swimming pools. A permanent in-ground or aboveground private residential swimming pool, accessory to a one-family or two-family dwelling, may be located within any required yard or setback. An in-ground pool shall be enclosed with a fence or wall at least four feet high, either around the perimeter of the rear yard or around the pool, with an entrance which can be latched or locked to prevent unauthorized, uncontrolled or accidental entry. An aboveground pool with all sides a minimum of four feet above grade shall have retractable steps that latch and prevent access to pool when not in use. For private residential pools, a wall or face of a dwelling or building may be used as part of pool enclosure. Such uses, if they meet the above conditions and standards, require a permit from the Zoning Officer.