Meltham STW - Wastewater Treatment Plant in Kirklees, West Yorkshire

Meltham STW is a wastewater treatment plant located near Huddersfield Road in Meltham, Kirklees, West Yorkshire, England. The facility serves a population of approximately 8,100 people, making it a small to medium-sized agglomeration under UK water industry classifications. It operates as part of the region's municipal wastewater infrastructure, managed by the local water authority. As a plant serving a population of this scale, Meltham STW is expected to meet secondary treatment standards under the Urban Waste Water Treatment Directive (91/271/EEC), which is transposed into UK law. The directive requires secondary biological treatment for discharges to freshwater and estuaries from agglomerations of this size. The treated effluent from Meltham STW is discharged into local watercourses that ultimately drain into the River Calder, a major tributary of the River Aire. The River Calder flows eastward through West Yorkshire, joining the River Aire near Castleford, and eventually reaches the North Sea via the Humber Estuary. The plant plays a key role in protecting the water quality of these rivers and supporting aquatic life in the catchment.

Meltham STW discharges into the River Calder catchment, which flows through West Yorkshire and joins the River Aire before reaching the Humber Estuary and the North Sea. The Calder is a spate river with a mixed urban and agricultural catchment, and its water quality supports diverse fish populations including brown trout and coarse fish. The plant's treatment helps reduce nutrient and organic loads, protecting downstream habitats and recreational uses.