53 Pa. Stat. § 14467
For every house or other building in cities of the first class, occupied or hereafter to be occupied for dwelling purposes, there shall be located conveniently on the premises occupied by such house or other building, or appurtenant thereto, at least one fixture or course of water-supply, for the exclusive use of each such house or other building, which fixture, or source of water-supply, shall be kept and maintained in such condition as to supply water thereto freely at all times: Provided, That where, in any case, such dwelling-houses are located on a court or common front yard, and have no rear or side yard, one fixture or source of water-supply may be established for each three such houses, provided the same is located in immediate proximity to such houses and is freely accessible from each of them.
53 P.S. § 14467