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Water companies should no longer be allowed to monitor their own levels of sewage pollution, the industry body has told the BBC exclusively.
Instead they are proposing a new, third-party monitoring system to build consumer trust.
The recommendation is part of a submission made to the UK government's independent review into the water sector.
Campaigners have long complained the companies' self-reporting has prevented the true scale of pollution in UK water being revealed.
A third-party system could add more pressure to the regulators, which have also been criticised for not holding the companies to account.