Mar-Tech
Underground Services LTD

Smoke Testing

Mar-Tech Sewer Smoke Testing

Although video inspection and other techniques certainly are important components of an I&I survey, research has shown that approximately 65% of all extraneous stormwater inflow enters the system from somewhere other than the main line. Smoke testing is a method of inspecting both the main lines and laterals. Smoke travels throughout the system, identifying problems in any connected lines. Even sections of line that were not known to exist or thought to be independent or unconnected.


Smoke testing is a relatively safe and simple process that consists of blowing smoke mixed with large volumes of air into the sanitary sewer line usually induced through a manhole. The smoke travels the path of least resistance and quickly shows up at sites that allow surface water inflow. Smoke will identify broken manholes, illegal connections including roof drains, sump pumps and yard drains, uncapped lines and even will show cracked mains and laterals, providing there is a passageway for the smoke to travel to the surface.

smoke test
smoke test
smoke test
Smoke test