In Brazil, the loss of water in supply systems is very common and the main cause is the lack of management of the pressures in the distribution network, which results in the breaking of pipes. To reduce the loss of water is necessary to know the cause, so this way the management pressures by monitoring with the help of WSN aims to monitor and ensure the minimum standards for supply to extensions consumers. Therefore, this project proposes a low-cost prototype for supervision of pressure in a water supply system collaborating with decision making the concessionaire to avoid an increase of production and disposal costs.