Bournemouth and West Hampshire Water's 180,000 customers are facing an increase in their bills.
The company has applied to industry regulator Ofwat for an immediate price review after a slump in demand for water meters.
Ofwat said it would make a final decision in January on whether to increase bills, which were an average of £102 this year.
Managing Director Tony Cooke said: "By addressing this issue now it will enable us to make price increases to
customers smoother over a longer period."
It will be the second time that the company has approached Ofwat for a price review.
Mr Cooke said the new application was sparked by a decline in demand for water from industrial customers.