An important element of analysis from climate change is the water balance. Soil water has a tendency to decrease due to temperature increase. It affects violent relatively large areas of land on long term, causing damage and environmental degradation through soil destruction, decreased agricultural production, vineyards and livestock, reducing the nutritional status of the population. Soil hydric deficit is the most important risk factor in agriculture. Through irrigation, soil moisture is maintained in critical phenophases between the minimal and water field capacity. Irrigation work is the only way to adjust the water flow in soil using water of specially designed accumulation, where that is possible or through abstraction from watercourses. Saving resources in the current context of climate change and of economic globalization is only possible through a sustainable development. To fit in sustainable development, the agriculture will require technologies and new equipment for more efficient recovery of irrigation water, it will use more unconventional water resources and it will comply the quality management requirements. In this context, the authors analyze the possibility of capitalization of properly treated wastewater to be considered good water for irrigation.