The water company United Utilities has conceded defeat in its legal battle to block public access to data on treated sewage it is discharging into Windermere in the Lake District.

Company officials initially claimed that data from phosphorus monitors at a main sewage treatment works at the lake was not environmental information. The company also wanted to block access to data from Cunsey Beck, a site of special scientific interest, which flows into Windermere.

The company argued that disclosing unverified data might “negatively impact public confidence regarding the way in which water companies operate their assets”.