++++ 1 . Actions against Member States for failure to fulfil obligations - Subject-matter of the dispute - Purely formal adaptation of the claims during the course of the proceedings owing to an amendment of national legislation - Whether permissible ( EEC Treaty, Art . 169 ) 2 . Approximation of laws - Quality of water intended for human consumption - Directive 80/778 - Implementation by the Member States - Derogations from the qualitative requirements set out in the directive - Conditions for granting ( Council Directive 80/778, Art . 9(3 ) ) 3 . Approximation of laws - Quality of water intended for human consumption - Directive 80/778 - Scope - Water from private sources - Exclusion ( Council Directive 80/778, Art . 2 ) 4 . Approximation of laws - Quality of water intended for human consumption - Directive 80/778 - Implementation by the Member States - Grant of an additional period for compliance with the quality requirements laid down in Annex I - Period for making the request - Period for implementing the directive ( Council Directive 80/778, Arts 19 and 20 ) 5 . Member States - Obligations - Implementation of directives - Failure - Justification - Not permissible ( EEC Treaty, Art . 169 )