The issue, noticed since the end of last year, is believed to be related to water from old mine workings entering the tunnel. The harbour has been receiving excess rainwater from the railway via the Queens Dock culvert for decades, but only recently has the water turned orange.
Chris Halpin from Network Rail expressed frustration about the situation affecting residents and businesses. The company is working with the Coal Authority and the Environment Agency (EA) to find the source of the water. The test results, once available, will guide the next steps in addressing the issue.
Whitehaven Harbour Commissioners CEO Deanne Shallcross shared concerns about the year-long issue, suggesting that the culvert should be temporarily blocked off or diverted.
The EA's area manager, Pete Miles, indicated that the environmental risk is relatively low due to dilution and tidal movements. However, the primary concern is the visual impact and its effect on marina users and the town. Samples taken by the EA revealed increased metals in the water.
Network Rail has already performed technical and hydrogeological surveys above the railway tunnel and plans to conduct further tests inside the tunnel over the weekend.