Wastewater treatment is becoming an increasingly strategic resource for agriculture, as it allows a potential pollutant to be turned into a useful asset for cultivation. In Arborea, Sardinia, innovative systems have been tested to reuse this water for irrigation, reducing pressure on traditional sources and ensuring greater water availability during drought periods. Beyond sustaining agricultural productivity, reuse also helps to limit groundwater contamination and reduce the overall environmental impact. The result is a virtuous cycle: less waste, more water for the fields, and a more efficient management of water resources to ensure the stability of local agricultural production.