Rural areas of SUDOE present multiple common challenges in relation to the integral water cycle: the scarcity of water resources (aggravated by climate change), the impact of agricultural activity on water quality (and the consequent difficulty of making compliance with the European directive compatible, the continuity of economic activity and the availability of drinking water) and the lack of efficiency and profitability in management (with obsolete facilities and few personal resources). It is essential to strengthen collaborative networks between the multiple actors involved in the management of water resources in order to implement efficient, sustainable and cost-effective water purification, reuse and purification techniques. This requires the creation of a new system of governance based on territorial cooperation. Water is a common good and as such, it does not understand borders. The project will develop a strategy to improve water efficiency and quality in SUDOE rural areas in a climate change context, 5 action plans for 4 organisations to improve water supply and treatment services, 3 pilot tests of cost-effective and sustainable solutions for water purification, purification and reuse, and a digital tool for 2 entities to improve water management. In addition, it will improve the capacities of public authorities in 3 countries and the knowledge about purification, reuse and purification techniques of 3 scientific institutions. GestEAUr will adopt an innovative approach, addressing the integral water cycle holistically (taking into account all its stages) and will go beyond the existing practice, which usually applies the same solutions whatever the characteristics of the territory where they are implemented. Thus, it will analyse and test cost-effective, avant-garde and nature-based (SBN) techniques (and combinations of techniques) specific to meet the needs of SUDOEs rural areas. In addition, it will provide digital tools to optimise and facilitate its management and planning.