Coupar Angus WWTP - Wastewater Treatment in Perth and Kinross, Scotland

Coupar Angus WWTP is a municipal wastewater treatment facility located on the A923 in Coupar Angus, Perth and Kinross, Scotland. It serves a population of around 10,250, classifying it as a medium-sized agglomeration under UK regulatory frameworks. As a Scottish plant, it operates under the Water Environment and Water Services (Scotland) Act 2003 and the Urban Waste Water Treatment (Scotland) Regulations 1994, which transpose the EU Urban Waste Water Treatment Directive. These regulations require secondary treatment for inland discharges from agglomerations of this size, with potential for tertiary treatment if the receiving water is sensitive. The plant's treated effluent is discharged into the River Isla, a tributary of the River Tay, which flows into the North Sea via the Tay Estuary. The River Tay is a nationally important salmon river and supports diverse aquatic life, including Atlantic salmon and freshwater pearl mussels.

The plant discharges into the River Isla, which flows into the River Tay, one of Scotland's largest and most ecologically significant rivers. The Tay Estuary is a key habitat for migratory fish and wading birds. The catchment supports agriculture and is designated for its biodiversity value, requiring careful management of nutrient inputs to prevent eutrophication.