Peter Hammond, a retired professor of computationalbiology and campaigner with Windrush Against Sewage Pollution, criticized the waterindustry for flouting poorregulation by the EnvironmentAgency
Seven companies - Southern Water, South West Water, Thames Water, United Utilities, Wessex Water, Yorkshire Water, and Welsh Water - discharged untreated sewage from 59 treatment works that treat 4.5million people's wastewater
Water companies can be acting illegally if they discharge untreatedsewage when conditions are dry (dryspill) or if they do not treat enough of the sewage before discharging it (earlyspill)
United Utilities, Southern Water, and Welsh Water questioned the accuracy of some data, while Yorkshire Water disputed Prof Hammond's understanding of the data
The sewage treatment works at Dorking run by ThamesWater had the highest number of unpermittedspills, discharging untreatedsewage into the RiverMole on 223 days over the last four years
Thames Water stated that all discharges of untreatedsewage are unacceptable and they are determined to work with authorities to stop them from being necessary
1,300 storm overflows and storm tanks at wastewatertreatment works have been identified as "spillingfrequently," and a major investigation into possible unauthorised spills at thousands of sewage treatment works is ongoing