DARLEY STW - Darley, North Yorkshire Wastewater Treatment Plant

DARLEY STW is a municipal wastewater treatment plant located in Darley, North Yorkshire, England. It serves a population of approximately 2,074 people, classifying it as a small agglomeration under UK and EU regulatory frameworks. The plant is situated near Nidd Lane, Moke Hill, in the rural landscape of the Yorkshire Dales. The plant provides secondary treatment, which is the standard required by the EU Urban Waste Water Treatment Directive (91/271/EEC) for freshwater discharges from agglomerations of this size. With a designed capacity of 2,159 cubic meters per day and an average daily discharge of 461.74 cubic meters, the plant operates well within its capacity. The UK's regulatory framework, enforced by the Environment Agency, ensures compliance with discharge permits that protect receiving water quality. The treated effluent from DARLEY STW is discharged into a local watercourse that ultimately drains into the River Nidd, a tributary of the River Ouse, which flows into the Humber Estuary and the North Sea. The plant plays a vital role in protecting the ecological health of the River Nidd, which supports diverse aquatic life and is used for recreation and agriculture.

DARLEY STW discharges into a local stream that feeds the River Nidd, a key tributary of the River Ouse in Yorkshire. The River Nidd flows through the Nidderdale Area of Outstanding Natural Beauty before joining the Ouse, which empties into the Humber Estuary, a major ecological site for migratory birds and fish. The plant's secondary treatment helps maintain water quality in this sensitive watershed, reducing nutrient and organic loads that could otherwise impact downstream habitats.