COLD HIENDLEY STW - Wastewater Treatment Plant in Wakefield, West Yorkshire

COLD HIENDLEY STW is a wastewater treatment plant located in the village of Cold Hiendley, near Wakefield in West Yorkshire, England. It serves a population of approximately 5,269 people, classifying it as a small to medium agglomeration under UK regulatory frameworks. As a UK plant, it operates under the Water Industry Act 1991 and the Urban Waste Water Treatment (England and Wales) Regulations 1994, which transpose the EU Urban Waste Water Treatment Directive. The plant discharges treated effluent into local watercourses that ultimately drain into the River Calder, a tributary of the River Aire, which flows into the Humber Estuary and the North Sea. The surrounding area is a mix of rural and suburban land, with the plant playing a key role in protecting local water quality and downstream ecosystems.

The treated effluent from COLD HIENDLEY STW enters local streams that feed into the River Calder, part of the Humber River Basin. The Calder flows east to join the River Aire near Castleford, and the combined waters reach the Humber Estuary, a major ecological site supporting diverse birdlife and fish populations. The plant's discharge contributes to the overall nutrient load in the catchment, which is managed under the UK's River Basin Management Plans to meet Water Framework Directive objectives.