On October 01, 2019, the City of Philadelphia implemented the 2018 Philadelphia Plumbing Code. During the first six months, either the existing 2004 Code or the new code can be used. After March 31, 2020 all reviews conducted by the Department will be done so under the 2018 Philadelphia Plumbing Code. After March 31, 2020, if the Philadelphia Single Stack System is the desired method of installation or modification, it must be noted on the permit and drawings that the submission is based on
Section P-919.