Judgment of the Court (Fourth Chamber) of 2 September 2021.#European Commission v Kingdom of Sweden.#Failure of a Member State to fulfil obligations – Directive 91/271/EEC – Articles 4, 5, 10 and 15 – Urban waste water treatment – Secondary or equivalent treatment of urban waste water from agglomerations of certain dimensions – More stringent treatment of discharges into sensitive areas – Article 4(3) TEU – Verification of data provided by the Member States – Obligation of sincere cooperation.#Case C-22/20.