Judgment of the Court (Seventh Chamber) of 7 December 2023.#European Commission v Hungary.#Failure of a Member State to fulfil obligations – Environment – Directive 91/271/EEC – Treatment of urban waste water – Article 3 – Collecting systems – Individual systems – Article 4 – Secondary or equivalent treatment – Article 5 – Sensitive areas – Article 15 – Monitoring of discharges.#Case C-587/22.