United Utilities, the largest of Britain's three publicly-listed water suppliers by market value, said underlying operating profit fell to 604.1 million pounds for the year to March 31 from 664.3 million pounds a year earlier.

The company, which supplies water across Cheshire, Lancashire and Cumbria, said revenue rose marginally to 1.73 billion pounds, helped by higher-than-expected volumes.

(Reporting by Mamidipudi Soumithri in Bengaluru; Editing by Sunil Nair)