But it is understood that in an analysis by the
storm overflows taskforce, made up of the Environment Agency, the water industry and Ofwat, which is yet to be published, much more modest costings have been estimated for tackling the scourge of raw sewage discharges.
Sources say the figure of £660bn appears nowhere in the report. The Angling Trust said the report cites a range of lower-cost options for progressively dealing with the worst and most damaging sewage discharges ranging from £3.9bn to £62.7bn, with an impact on average water bills of between £19 and £58 a year.
It is also understood to estimate that an overall plan to reduce spills from storm overflows to an average of 10 a year in sensitive areas would cost between £13.5bn and £21.7bn.
Christine Colvin, from the
Rivers Trust, said the huge range in the government’s figures – between £150bn and £650bn – indicated a low level of confidence in them.
She said the real costs could be substantially lower, and that tackling the scale of raw sewage pollution did not require complete separation of the sewerage systems, because some of the system actually worked already. “Nobody is proposing digging up our entire sewerage network and starting from scratch,” Colvin said.
“We know that nature based solutions are more difficult to cost, but in some places can be cheaper. They also bring multiple benefits – they help nature’s recovery, can provide new green and blue spaces and take up rather than emit carbon.
“These need to be considered seriously by water companies, developers and local government as an upstream solutions … we also need to consider the cost of pollution into our rivers and of not acting. At the moment that is being externalised on to the environment and the next generation. This is not something we should justify or continue.”
Hugo Tagholm of the campaign group Surfers Against Sewage said putting a figure of £660bn into the public domain was misinformation designed to scare the public.
“The figures are somewhere in the region of between £3.7bn and £62.bn to deal with the worst of the sewage pollution. This is well within the profits and dividends of these companies and if it were to be passed on to the bill-payer, it could be done at an affordable level.”
Analysis published by the Guardian last year showed the nine English water companies had paid out dividends of £57bn over the three decades since privatisation.