SCOTLAND'S water authority has delivered nearly 90per cent of the improvements required of it in the current four-year period, the industry's regulator said yesterday.

Some of the improvements required for the period 2002-06 have been hit with delays, but Scottish Water will not be able to charge customers for any extra costs resulting from the delays.

The chairman of the Water Industry Commission, Sir Ian Byatt, said yesterday: "I am glad to see Scottish Water's investment programme is delivering results for customers and the environment.

"There have been some delays but I hope they will be overcome."

The commission said Scottish Water had made "significant progress" in replacing worn-out mains and sewers, reducing the number of sewerage overflows performing in an unsatisfactory way, and improving water supply pressure to properties.

Its score-chart ranges from reaching 100per cent of the target for the number of properties removed from the poor pressure register - to just 56.5per cent of the target for first-time sewerage provision to properties.

Scottish Water had largely met its targets for replacing worn-out mains and sewers. It scored nearly 100per cent for properties receiving first-time provision of water, 78per cent for water quality improvements and 90per cent for the number of unsatisfactory over f lows removed.

Scottish Water welcomed the report and said it expected to have met 98per cent of its targets by March of next year.