Electro scanning method can be used for locating leaking defects in lateral pipes made of insulating materials (e.g., plastic, clay, concrete, RCP, brick) by measuring the electrical current flow between a probe that travels in the pipe (a part of lateral where the probe is passing must be filled with water) and a surface electrode (a metal stake in the ground). If the pipe has no defects, the current flow is very low. However, various defects (structural, corrosion or joint defects) allow electric current to flow through the pipe wall when the probe center is close to the defect. Increased electrical current flow indicates pipe defects that allow liquids to flow into or out of the pipe, and the greater the electrical current the larger the pipe defect. The method is not applicable in metallic pipes (e.g., cast iron laterals).