Case C-668/19: Judgment of the Court (Sixth Chamber) of 6 October 2021 — European Commission v Italian Republic (Failure of a Member State to fulfil obligations — Article 258 TFEU — Directive 91/271/EEC — Collecting and treatment of urban waste water — Article 3 to 5 and 10 — No collecting systems for urban water in certain agglomerations — No secondary treatment or equivalent treatment of urban waste water in certain agglomerations — Construction and operation of treatment plants — Control of discharges from such plants — Sensitive areas — More stringent treatment of waste water)