Opinion of the Advocate General — ECLI:EU:C:2004:183
Date: 2004-03-25
Language of the case: French
Based on: Treaty establishing the European Economic Community (1957)
Subject matter: Environment;Pollution
Procedure: Action for failure to fulfil obligations - successful;Action for failure to fulfil obligations - unfounded
Origin: France

Summary of the Judgment 1. Environment – Urban waste water treatment – Directive 91/271 – Identification of areas sensitive to eutrophication – Eutrophication – Definition (Council Directive 91/271, Arts 2(11) and 5(1)) 2. Environment – Urban waster water treatment – Directive 91/271 – More stringent treatment of discharge of the urban waste water from large agglomerations – Implications (Council Directive 91/271, Art. 5(2) and (3), Annexes I.B(3) and II.A(a), second para.) 1. By virtue of Article 5(1) of Directive 91/271 concerning urban waste water treatment, the Member States are obliged to identify the areas where discharges of urban waste water contribute significantly to eutrophication or the risk of eutrophication. The definition of eutrophication in Article 2(11) of that directive must be interpreted in the light of its objective, which goes beyond the mere protection of aquatic ecosystems and attempts to conserve man, fauna, flora, soil, water, air and landscapes from any significant harmful effects of the accelerated growth of algae and higher forms of plant life resulting from discharges of urban waste water. For there to be eutrophication within the meaning of the directive, there must be a cause and effect relationship between enrichment by nutrients and the accelerated growth of algae and higher forms of plant life on the one hand and, on the other hand, between the accelerated growth and an undesirable disturbance of the balance of organisms present in the water and to the quality of the water concerned. Species changes involving loss of ecosystem biodiversity, nuisances due to the proliferation of opportunistic macroalgae and severe outbreaks of toxic or harmful phytoplankton constitute an undesirable disturbance of the balance of organisms present in the water. As regards deterioration of water quality, that criterion refers not only to deterioration of the quality of the water which produces harmful effects for ecosystems but also deterioration of the colour, appearance, taste or odour of the water or any other change which prevents or limits water uses. (see paras 16, 19, 23-25) 2. Under Article 5(3), in conjunction with Annex I.B(3), of Directive 91/271 concerning urban waste water treatment, the treatment provided for in Article 5(2) of that directive is more stringent than that described in Article 4 of that directive and covers urban waste water entering collecting systems and from agglomerations of more than 10 000 ‘population equivalent’ (p.e.). That treatment means, inter alia, that discharges into areas sensitive to eutrophication must satisfy the requirements shown in Table 2 of that Annex, subject, however, to the provisions of the second paragraph of Annex II.A(a) to that directive, which provide that, as regards large agglomerations, the removal of phosphorus and/or nitrogen should be included unless it can be demonstrated that the removal will have no effect on the level of eutrophication. (see paras 104-105)