The hack went undetected by the Staffordshire firm for 20 months, regulator says.
Proactive security is a legal requirement, not an optional extra."Follow BBC Stoke & Staffordshire on BBC Sounds, Facebook, X and Instagram. More on this story'Worrying precedent' as hackers target water firmWater customers' bank details may have been leakedHack leaves water customers feeling vulnerableRelated internet linksInformation Commissioner's OfficeSouth Staffordshire WaterCoventry & WarwickshireDerby
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