For discharges of municipal wastewater into urban areas of more than of Italian Legislative Decree No. 152/06, a Protocol on proper performance of control measures has been drawn up with ARPAE/ARPAT, aimed at scheduling the number of annual controls on the discharge, to assess its compliance, 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.