St. Louis—Residents of Missouri’s most populous county will continue to be protected by the provisions of three Uniform Codes developed by the International Association of Plumbing and Mechanical Officials (IAPMO): the 2015 Uniform Plumbing Code (UPC®), 2015 Uniform Solar Energy and Hydronics Code (USEHC®), and 2015 Uniform Swimming Pool, Spa and Hot Tub Code (USPSHTC®). The St. Louis Read more