Overview
CALSTOCK STW is a secondary treatment plant serving 2,060 people in Calstock, Cornwall, England. It discharges 458.63 m³/day of treated wastewater, with a designed capacity of 3,097 m³/day.
CALSTOCK STW is a wastewater treatment plant located in Calstock, a village in Cornwall, England, United Kingdom. It serves a population of approximately 2,060 people, classifying it as a small agglomeration under the EU Urban Waste Water Treatment Directive (UWWTD). The plant is situated near the River Tamar, which forms the border between Cornwall and Devon. The plant provides secondary treatment, which is the standard required by the UWWTD for freshwater discharges from agglomerations of this size. It has a designed capacity of 3,097 m³/day and currently discharges an average of 458.63 m³/day of treated effluent. The plant is operated as part of the UK's wastewater infrastructure, regulated under the Water Industry Act 1991 and overseen by the Environment Agency. The treated effluent from CALSTOCK STW discharges into the River Tamar, which flows southward into the Tamar Estuary and ultimately into the English Channel. The Tamar Valley is an Area of Outstanding Natural Beauty and supports diverse aquatic life, including salmon and otter populations. The plant plays a key role in protecting this sensitive riverine ecosystem from untreated sewage.
Environmental context
CALSTOCK STW discharges treated effluent into the River Tamar, which flows through the Tamar Valley and into the Tamar Estuary before reaching the English Channel. The Tamar Estuary is a designated Site of Special Scientific Interest (SSSI) and supports important habitats for fish, birds, and invertebrates. The plant's secondary treatment helps reduce nutrient loads and organic pollution, safeguarding water quality in this ecologically sensitive river system.
Frequently asked questions
CALSTOCK STW is located in Calstock, Cornwall, England, United Kingdom, near the River Tamar.
The plant serves approximately 2,060 people, classifying it as a small agglomeration under the EU Urban Waste Water Treatment Directive.
The treated effluent is discharged into the River Tamar, which flows into the Tamar Estuary and then the English Channel.
CALSTOCK STW provides secondary treatment, which is the standard required by the EU UWWTD for freshwater discharges from agglomerations of this size.
As a UK plant, CALSTOCK STW operates under the Water Industry Act 1991 and is regulated by the Environment Agency, with discharge permits ensuring compliance with environmental standards.
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