Chemical state of rivers pursuant to Legislative Decree 152/06

The Chemical State of water bodies within the meaning of Legislative Decree No 152/2006 (Annex 1 Tab. 1/A of Ministerial Decree 260/2010) is a descriptor which considers the presence in surface watercourses of priority substances (1.2 Dichloroethane, alachlor, Atrazin, Benzene, Chlorpiriphos, Clorfenvinfos, Dietylsylphthalate, Dichloromethane, Diuron, Fluorantene, Isoproturon, Naftalene, Nichel, Octylphenol, Pentachlorophenol, Lead, Simazine, trichlorobenzenes, Trichloromethane, Trifluralin), Priority Dangerous (4-Nonylphenol, Chloride Alkanes, Anthracene, Benzo(a)pyrene, Benzo(b+k)fluorantene, Benzo(ghi)perylene, Indeno(123-cd)pyrene, Cadmium, Endosulfan, Hexachlorobenzene, Hexachlorobutadiene, Hexachlorocyclohexane, Mercury and pentachlorobenzene) and other substances (4-4' DDT, Total DDT, Aldrin, Dieldrin, Endrin, Isodrin, Tetrachloroethylene, Carbon Tetrachloride and Trichloroethylene). The calculation procedure involves comparing the annual average concentrations of sites monitored over the three-year period 2010-2012 with environmental quality standards (EQS-MA). In addition, for some of these substances, the single measure is compared with a maximum permissible concentration (EQS-CMA). In 2010 the first three-year monitoring cycle (2010-2012) under Legislative Decree no. 152/06. The water body, which meets, for the substances on the priority list, all environmental quality standards (EQS-MA and EQS-CMA) at all monitored sites, is classified under “Good Chemical Status”. If not, it is classified as “Non-achievement of the Chemical State”