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4. European Council (1980) Council Directive 80/778/EEC of 15 July 1980 relating to the quality of water intended for human consumption as amended by Council Directives 81/858/EEC and 91/692/EEC (further amended by Council Regulation 1882/2003/EC)
5. European Council (1991) Council Directive 91/271/EEC of 21 May 1991 concerning urban waste-water treatment