Bills will rise by an average of £86 for a typical household from April.
This will affect people living in Greater Manchester, Merseyside, Lancashire, Cumbria, most of Cheshire and parts of Derbyshire, where United Utilities runs the water network.
After the initial increase, the company plans to raise bills by an average of £31 each year until 2030, a 32% increase over five years.
That means the average annual bill will reach £585 by 2030, compared to the current 2024-25 figure of £442.
John Vinson, from the Consumer Council for Water said these figures could change before April as they “do not include inflation”.