The former chief executive of Southern Water has been charged with conspiracy to defraud authorities over allegations he was involved in a plan to manipulate water quality tests to avoid millions of pounds in penalties.
Matthew Wright is accused alongside three others of conspiring to defraud the Environment Agency (EA) and water regulator Ofwat.
The EA previously asked a judge to issue a summons against Wright, charging him with the offence, along with Philip Barker, Clive Massey and Mark Gregory.
The summons was issued last year but Wright launched a legal challenge which was dismissed by two senior judges on Wednesday.