Experts say there are also big regional variations in the numbers of people receiving support.
Inflation is the main reason, according to regulator Ofwat.
However, customers do ultimately fund the costs of improving standards - and the challenges faced in different regions play a part in the discrepancy in bills.said concerns about water companies discharging raw sewage into riversHe told the BBC: "The truth is that you can't make the sort of investments that we need to improve sewage infrastructure, without some payment somewhere.
Customers in that region get a government reduction, due to the region's long coastline and the amount of bathing water that requires maintenance. A Wessex Water spokesperson said: "Bills in the region are slightly higher than other parts of the country because there are more pipes per customer to maintain and the cost of moving water across our region is expensive."Andrew White said the current system of support was a postcode lottery
In Severn Trent's region, it said only about 21% of those facing water poverty were lifted out of it by current support schemes. Christine McGourty, CEO of Water UK, the trade association representing water companies, said: "I would urge anyone who's concerned to get in touch with their water company."Northumbrian Water said they were working on a number of improvements
They said they were also spending £145m on the supply network across County Durham and Teesside, replacing sections that were more than 100 years old.
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