Consumers have been warned that there could be a huge hike in water bills to cover the cost of improving flood defences.
Baroness Young, the head of the Environment Agency, said millions of pounds must be spent on improving drainage and protecting infrastructure, such as electricity substations and water plants.
She said: 'Bills are going to have to go up, both because of drought and floods. You either pay upstream to prevent, or you pay downstream to mop up but you've got to pay, climate change is coming home to roost.'
National Consumer Council for Water are seeking assurances from water companies to ensure that they are spending money wisely.
Chief Executive, Tony Smith, said: 'Firstly, we want to press the water companies and Ofwat to ensure that the huge amount that has been spent on maintenance already - that customers are paying for - has been spent in a useful way and delivered the right protection for customers.
'Looking forward, the question is what more if anything needs to be done to protect ourselves from future flooding and climate change. What is the bill associated with that, the price tag? And what benefits are the customers going to get?
Mr Smith added: 'Customers should only be paying for things relating directly to the water and sewage system and not to general flooding.'
More heavy rain is forecast for some of the regions hit by the recent floods. Persistent downpours are expected across south Wales and into England throughout the weekend.