The following words and phrases when used in this chapter shall have the meanings given to them in this section unless the context clearly indicates otherwise: 'Combined sewer.' A sewer used for the receiving and collecting of sewage and liquid waste from the inside of buildings and structures, storm water, roof or surface drainage, sump pump discharge and draining from foundation drains. 'Sanitary sewer' or 'sanitary sewer system.' A sewer or sewers used for receiving and collecting sewage matter and liquid waste from the inside of buildings and structures. Storm water shall not be permitted to enter into a sanitary sewer. A sanitary sewer or sanitary sewer system does not include a combined sewer. 'Sewer system.' Either a sanitary sewer or a combined sewer and includes pump stations and force mains.
Pennsylvania Legal Code