For discharges of municipal wastewater into urban areas of more than Italian Legislative Decree No. 152/06, a Protocol for the proper performance of control activities between ARPAE/ARPAT has been drawn up, aimed at planning the number of annual controls on the discharge, to assess the conformity of the discharge, while for discharges in smaller urban areas (less than 2,000 population equivalents) the limits of acceptability and the appropriate treatment are set by the Regions.