Tatworth STW - Secondary Wastewater Treatment Plant in Dorset, England

Tatworth STW (Sewage Treatment Works) is located on Green Lane in Thorncombe, Dorset, England. The plant serves a population of around 2,663 and operates under the regulatory framework of the UK Environment Agency, which enforces standards aligned with the EU Urban Waste Water Treatment Directive (91/271/EEC) for secondary treatment. As a small agglomeration, it is required to provide secondary treatment to protect receiving waters. The plant has a designed capacity of 3,188 cubic meters per day and currently discharges a daily volume of approximately 593 cubic meters, indicating it operates well below its design capacity. The treatment process is secondary, which typically involves biological treatment followed by settlement, ensuring compliance with organic matter and suspended solids standards. The treated effluent from Tatworth STW discharges into local streams that feed into the River Axe, which flows south through Devon and enters the English Channel at Axmouth. The Axe catchment supports diverse aquatic life, including salmonid fisheries, and is ecologically sensitive to nutrient enrichment. The plant's discharge is regulated to minimize impacts on this important river ecosystem.

Tatworth STW discharges into the River Axe catchment, which drains into the English Channel at Lyme Bay. The River Axe is a designated salmonid river supporting populations of Atlantic salmon and brown trout, as well as other freshwater species. The catchment is predominantly rural with agricultural land use, making it sensitive to nutrient inputs. The plant's secondary treatment helps reduce biochemical oxygen demand and suspended solids, protecting downstream water quality and aquatic habitats.