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Ex-CEO of Southern Water among four charged with conspiracy to defraud

The case could lead to 10 years in prison and involves an alleged scheme that avoided about £45 million in penalties, the Environment Agency said.

  • On Wednesday, two senior High Court judges dismissed a legal challenge from former Southern Water CEO Matthew Wright, clearing the way for criminal proceedings against him and three former colleagues for conspiracy to defraud.
  • Prosecutors allege that between 2012 and 2017, the defendants conspired to defraud regulators by creating artificial "no-flow" events at treatment works to manipulate the Operator Self-Monitoring regime and hide pollution failures.
  • The Environment Agency estimates this scheme allowed Southern Water to avoid approximately £45 million in penalties. Evidence revealed the group allegedly used tankers to remove wastewater, creating conditions that prevented mandatory sampling.
  • Southern Water stated the alleged historic failures were uncovered during a 2017 internal investigation, asserting it is a "completely different company now." The case will now proceed at Medway Magistrates' Court.
  • If convicted, the defendants face up to 10 years in prison. Separately, the government has tightened Operator Self-Monitoring rules and pledged to end the practice, marking a significant regulatory shift.
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nippon.com broke the news on Tuesday, July 21, 2026.
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