Cardiff West and Barry Cog Moors Wastewater Treatment Plant, Lavernock, Wales

Cardiff West and Barry Cog Moors is a major wastewater treatment plant located near Lavernock in the Vale of Glamorgan, Wales. It serves a population of around 194,000, making it a large agglomeration under UK and EU classification. The plant is situated on the coast of the Bristol Channel, an important estuarine environment. As a large treatment facility in the United Kingdom, the plant is subject to stringent regulatory standards under the Urban Waste Water Treatment Directive (transposed into UK law). For agglomerations of this size, secondary treatment is mandatory, and tertiary treatment may be required if the receiving waters are designated as sensitive areas. The plant's designed capacity is 1.00 (likely in megaliters per day or similar unit), indicating substantial infrastructure. The treated effluent from the plant discharges into the Bristol Channel, which is part of the Severn Estuary, a major ecological feature supporting diverse marine life and migratory bird populations. The estuary drains into the Celtic Sea and ultimately the Atlantic Ocean. The plant plays a critical role in protecting the coastal water quality of the Bristol Channel and the broader marine environment.

The plant discharges into the Bristol Channel, a dynamic estuary that forms part of the Severn Estuary system. This water body is ecologically significant, supporting a wide range of marine species and serving as a key migratory route for fish and birds. The estuary drains into the Celtic Sea and then the Atlantic Ocean. The plant's location within 50 km of the coast means its discharge can influence nearshore water quality, making effective treatment essential for protecting sensitive coastal habitats.