Southern Water has asked to increase bills by 84 per cent by 2030.
The water company, which covers Kent, Sussex, Hampshire, and the Isle of Wight, is among 10 companies that have requested higher bill increases than initially planned.
If the increase is approved, this would see customers paying an average of £808.79 by the end of the decade.
The increase was revealed after Ofwat released figures on Tuesday.
The watchdog said many companies requested higher increases than initially planned as they need to spend more on upgrading their pipes, sewers, and reservoirs, and therefore need bills to go up too.
Ofwat wrote in an update on Tuesday that this was "mostly to meet the requirements of other regulators like the Environment Agency and Drinking Water Inspectorate".
However, some of the increases are designed to meet "changes to the proposed rate of return for investors."
Ofwat is due to make a final decision on bill increases on December 19.
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