Plastic water lines can no doubt be difficult to locate. First look for the obvious….a tracer wire or stand alone hose faucets between a house or structure and the water meter. If no visible clues, look for other utilities that might be buried and locate them for points of reference. As seen in this picture, a water leak on a plastic pipe was located in the same trench used to support electical services. All points of reference and clues are valuable and must not be over looked when in search of a buried plastic water line with no tracer wire. Happy hunting!