Tackling storm overflows by entirely splitting out sewage from clean surface run off would treble water customers' average annual bills to more than £1200, Lord Benyon has told fellow peers. During a debate on discharges in the House of Lords on Monday (14 November), the water minister was challenged by Liberal Democrat peer Baroness Bakewell about the timeframe being proposed by the government to deal with sewage discharges from storm overflows.