Projections carried out by scientists about the situation of the water, point out that Peru will suffer of shortage of the water resource in the 2025. The droughts in several regions, the progressive loss of the glaciers, the contamination of the coastal basin, the over explotation of the aquifer resources, the irresponsible of the use of the resource for the bad practice of irrigation, the growing demand of water in densely populated cities, are problems that nowadays are impacting in those places of Peru where the water resource is scarce. The measures to counteract the shortage of water will depend of the proper decisions that take The State and the governors. Some developed experiences in the State of Israel can be taken in consideration for the management of water in Peru. The State of Israel planned and carried out intensive efforts of Investigation and development to long-time to integrate the wastewaters to the water resources of the country. The main objective of the wastewaters treatment in Israel is not only to protect the public health but also has as objective the protection of the environment and the reuse of the wastewaters in the agriculture. The wastewaters are often seen as a waste, a nuisance, a risk for the public health. The Israeli principle sustains that THE WASTEWATERS CONSTITUTE A RESOURCE, ESPECIALLY AN AGRICULTURAL RESOURCE. In Peru, the wastewaters appropriately treated can provide a source of valuable water for undrinkable uses. The combined practice of wastewaters treatment systems and a rational agricultural irrigation such as is used in Israel, would mean an economically possible strategy to develop a source of crucial water for the Peruvian agriculture.