139. In this subdivision,(1) “waste water” means water carrying solid, liquid or gaseous residue from a process, an establishment or a building, mixed or not with underground, cooling, rain or surface water and, unless the context indicates otherwise, underground water, cooling water, rain water and surface water;
(2) “cooling water” means water, from an air-conditioning apparatus or from a cooling or refrigeration process, which causes only thermal pollution;
(3) “domestic waste water” means waste water from the plumbing system of a building and nor mixed with underground, surface, rain or cooling water not with industrial waste water;
(4) “industrial waste water” means waste water from an industrial, manufacturing, commercial or institutional process or establishment, or any other process or establishment of the same nature, except domestic waste water;
(5) “purification works” means a sewer, a sewer system, a waste water pumping station, a water purification station or any other works used to collect, receive, carry, treat or drain waste water, or a part of any such equipment.