£3.6bn Tunnel Plan Proposed to Stop Sewage Spills in Lake District's Windermere

A 3.6 billion pound project has been proposed to stop sewage from being discharged into Windermere, which is England's largest lake and sits inside a Unesco World Heritage site that draws close to 18 million visitors every year.

The Project Details

Backed by local water company United Utilities and clean water campaigners, the plan features a tunnel up to 12 miles or 19 kilometres long to carry sewage away from the lake. The overall proposal is called Only Rainwater into Windermere, and two different options are on the table regarding where treated effluent would go at the end of a four-metre-wide tunnel, with one option sending it into the River Leven and the other into the Irish Sea at Ulverston. The project would also connect 12,800 people to the sewage network for the first time by building up to 86 miles or 138 kilometres of new sewage infrastructure and a single new wastewater treatment works. Both raw sewage and treated effluent currently go into the lake, and campaigners point to this as the cause of algal blooming that turns parts of the water green each summer.

Funding and Reactions

United Utilities chief executive Louise Beardmore called the proposal a 100-year solution for the lake, noting it shifts away from the usual five-year investment cycles. Save Windermere group founder Matt Staniek called the proposal a milestone but stressed it is still just a plan on paper until sewage actually stops entering the water. Two funding options are under discussion, with one passing costs to United Utilities customers to add up to 3.17 pounds to monthly bills, while Nigel Wilkinson from the Love Windermere group wants costs spread nationally to increase all bills in England by up to 35 pence a month.

Context

Lake Windermere holds around 300 billion litres of water and takes nine months for water entering one end to reach the other, making pollution particularly hard to flush out quickly. Wastewater systems often struggle during heavy rain when treatment works become overwhelmed and spill raw sewage directly into natural water bodies. The British government now holds the decision on whether to develop the plan further, following earlier promises made by officials to protect the iconic lake.