Discharges into the public hydraulic domain are taxed with a discharge control fee. The charge is levied on all discharges into the public hydraulic domain (whether or not authorised) with the taxable person carrying out the discharge, and the taxable event being the discharge (article 113 of Decreto Legislativo 1/2001). The management and settlement of the fee corresponds to the Basque Water Agency (Decreto 229/2021, 2 November).