Pipelines leakage is the main problem faced by industries. The main causes of leakage on pipelines are corrosion, crack and disaster. This problem must be detected early to ensure that maintenance work can be done quickly to prevent pipe bursts, as well as to minimize operational costs. The objective of this research is to review a method for early detection of leakage on pipeline that affect by the changing water level in the pipeline. The method used in this research is ultrasonic sensor that is implanted on the outer surface pipeline.