Smoke Testing involves the introduction of a non-toxic vapor (smoke) into the sanitary sewer system. Once a smoke bomb is ignited, high-powered blowers force the smoke through a segregated line segment. Field technicians then look for smoke exiting the sewer system through various locations. These leaks or intentional tie-ins to the sewer allow rainwater to wastewater treatment cost. Smoke testing is the least expensive method of identifying inflow/infiltration in a collection system. Typical charted smoke locations include: private property sewer service lines and open sewer clean-outs main line leaks and broken plumbing lines yard drains and abandoned sewer lines storm drains and manholes Back