Langdon WWTW Begelly Pembrokeshire STW - Secondary Treatment Plant in Jeffreyston, Wales

Langdon WWTW Begelly Pembrokeshire STW is a wastewater treatment plant located in Jeffreyston, Pembrokeshire, Wales, United Kingdom. The plant serves a population of approximately 1,589 and is situated in a rural coastal area within 10 km of the sea. The plant provides secondary treatment, which is the standard required under the EU Urban Waste Water Treatment Directive for agglomerations of this size. With a designed capacity of 2,396 m³/day and a current discharge volume of 353.77 m³/day, the facility operates well below its capacity, indicating room for future growth or seasonal variations. The treated effluent is discharged into local watercourses that eventually reach the Pembrokeshire coast, an area known for its diverse marine habitats and important coastal ecosystems. The plant plays a key role in protecting the local environment from untreated sewage, supporting water quality in the region.

The plant discharges into small streams that flow into the Pembrokeshire coastal waters, part of the Celtic Sea. This coastal area supports diverse marine life, including seabird colonies and important fish spawning grounds. The secondary treatment provided by the plant helps reduce nutrient and pollutant loads, protecting the sensitive coastal ecosystem from eutrophication and contamination.