the oecd review regarding water quality and wastewater explains why greece has experienced severe delays in implementing the eu urban wastewater directive and wastewater management the report highly recommends improvement of the wastewater management in compliance with the eu urban waste water directive reduction of water pollution by dangerous substances and illegal discharges of wastewater as well as better allocation to make sure water flows to uses with the highest value for more information see chapter and recommendations from oecd workshop on improving the information base to better guide water resource management decision making zaragoza spain may wwwoecdorgwaterworkshop