Article 21 6.

On the basis of the report of the Member States, the Commission may adopt implementing acts in order to specify a minimum list of relevant pollutants likely to be found in urban wastewater and to develop a methodology for identifying relevant pollutants likely to be found in urban wastewater, taking into account the local conditions and the risk assessment carried out under relevant Union law as well as criteria and frequency for revising the exclusion of some pollutants as set out in paragraph 3, second subparagraph, of this Article. Those implementing acts shall be adopted in accordance with the examination procedure referred to in Article 28(2).