Llandovery Wastewater Treatment STW - Secondary Treatment Plant in Carmarthenshire, Wales

Llandovery Wastewater Treatment STW is a municipal facility located in the town of Llandovery, Carmarthenshire, Wales. Serving a population of approximately 2,000, the plant plays a key role in managing domestic wastewater for this rural community in the upper Tywi Valley. The plant provides secondary treatment, which is the standard biological treatment required under the EU Urban Waste Water Treatment Directive (91/271/EEC) for agglomerations of this size. With a designed capacity of 2,343 cubic meters per day and an average discharge volume of 449.5 cubic meters per day, the facility operates well within its capacity, ensuring reliable treatment. Treated effluent from the plant is discharged into the River Tywi or its tributaries, which flow southward through Carmarthenshire to Carmarthen Bay in the Bristol Channel. The river supports diverse aquatic life and is an important migratory route for salmon and sea trout, making the plant's treatment performance vital for downstream ecology.

The plant discharges into the River Tywi catchment, which drains into Carmarthen Bay and the Bristol Channel. The Tywi is a designated Special Area of Conservation (SAC) for its salmon, otter, and lamprey populations, and supports a rich ecosystem. Effective secondary treatment helps protect these sensitive habitats from nutrient pollution and organic loading.