Whalley STW - Wastewater Treatment Plant in Ribble Valley, Lancashire

Whalley STW is a wastewater treatment plant located in Whalley, near Ribble Valley in Lancashire, England. The facility serves a population equivalent of around 5,076, classifying it as a small agglomeration under UK regulatory frameworks. Situated in a rural setting, the plant is part of the region's infrastructure for managing domestic wastewater. As a small-scale treatment works, Whalley STW is subject to the requirements of the Urban Waste Water Treatment Directive (transposed into UK law via the Urban Waste Water Treatment (England and Wales) Regulations 1994). The plant's design capacity and discharge volume are not publicly reported. The treated effluent from Whalley STW is discharged into local watercourses that ultimately drain into the River Calder and then the River Ribble, which flows into the Irish Sea near Preston. The Ribble catchment supports diverse aquatic life and is an important ecological corridor in Lancashire. The plant's operations contribute to protecting water quality in this river system.

Whalley STW discharges into local streams that feed the River Calder, a tributary of the River Ribble. The Ribble flows westward through Lancashire and enters the Irish Sea at the Ribble Estuary, a site of ecological importance for migratory birds and fish. The catchment supports salmonid populations and other freshwater species, making nutrient and pollutant control critical for downstream habitats.