LETHAM WTP - Secondary Wastewater Treatment Plant in Letham, Angus, Scotland

LETHAM WTP is a wastewater treatment plant located in Letham, Angus, Scotland, serving a population of approximately 1,653. The plant is situated inland, about 50 km from the coast, and operates under Scottish environmental regulations. The plant provides secondary treatment, which is the standard required under the EU Urban Waste Water Treatment Directive (transposed into UK law) for agglomerations of this size. With a designed capacity of 2,750 m³/day and an average discharge volume of 368.02 m³/day, the plant operates well below its capacity, indicating room for future growth. Treated effluent is discharged into local watercourses that drain into the North Sea via the River Tay or nearby coastal waters. The plant plays a key role in protecting the water quality of the region's rivers and downstream marine environment, supporting aquatic life and recreational uses.

The plant discharges into local streams that flow into the River Tay, one of Scotland's major rivers, which empties into the North Sea via the Tay Estuary. This estuary is an ecologically important area supporting diverse birdlife, fish species such as salmon, and extensive mudflats. The secondary treatment provided by LETHAM WTP helps reduce nutrient and organic pollution, safeguarding the health of these downstream ecosystems.