Quality control of water for human consumption in accordance with the provisions of Royal Decree 140/2003 of 7 February, establishing health criteria for water quality for human consumption and the Health Surveillance Program established drinking water of Aragon. It includes the following work to be done: Analytical Control: performing sensory analyzes (including pH and chlorine), control, complete, complete small, complementary and in the consumer's tap and default management. Obtaining laboratory results and data transmission. Supply of disinfectant and preventive maintenance of disinfection equipment. Updating protocols self-control and supply management. Other provisions included in the contract (reports, studies, ...).