IV quarter 8.4 9.05 9.55 9.3 10 8.3 10.5 11.9 2.5 2.5 2.5 3.6 3.6 2.6 2.6 2.6 2.7 2.8 3.6 3.7 4 4.2 3.2 3.2 3.93.93.93.93.9 3.9 3.9 3.9 WATER SERVICE PRICING With resolution 664/2015, ARERA established a framework of fair, certain and transparent rules concerning the tariff in the water sector for the period 2016-2019.