Smoke testing of sewer systems is primarily used to find places where ground water and storm runoff can enter the sanitary sewer system.
Non-toxic smoke is used to find leaks in plumbing and sanitary sewer systems. Artificially created smoke is forced into the pipe or container. Plumes of smoke form where there are defects. It is particularly useful where completely sealing the system is not practical such as ventilated sanitary sewer systems.
Smoke testing is not typically helpful in assigning a condition score to an asset.