
Añarbe Water Association and its public management entity, Aguas del Añarbe - Añarbeko Urak SA, provide water supply and sanitation services to the municipalities of Donostia-San Sebastián, Errenteria, Hernani, Lasarte Oria, Pasaia, Oiartzun, Lezo, Urnieta, Usurbil y Astigarraga, representing a population of more than 300.000 inhabitants.
WRDSS supports water resource and reservoir managers by providing inflow forecasting and water resource outlooks for hydropower, production, flood protection, irrigation, water supply and environmental flows.