Overview
ST HELENS STW is a wastewater treatment plant serving St Helens, England, with a population equivalent of 137,463. It operates under the UK's regulatory framework, discharging treated effluent into local waterways.
ST HELENS STW is a major wastewater treatment facility located in St Helens, England, within the Liverpool City Region. Serving a population equivalent of 137,463, it is classified as a large agglomeration under the UK's implementation of the EU Urban Waste Water Treatment Directive (UWWTD). The plant is situated in Sankey Valley Country Park, near the Fingerpost area of Blackbrook. As a large-scale treatment plant, ST HELENS STW is expected to provide secondary treatment as a minimum, with tertiary treatment likely required to meet stringent water quality standards for sensitive areas. The UK's Environment Agency regulates discharges under the Environmental Permitting Regulations, ensuring compliance with environmental objectives. The plant's designed capacity is 1.00 (likely in megaliters per day or similar units), indicating its scale. The treated effluent from ST HELENS STW is discharged into the Sankey Brook, which flows into the River Mersey and ultimately the Irish Sea. This watercourse supports diverse aquatic life and is part of the Mersey Basin, a region with significant ecological and industrial history. The plant plays a crucial role in protecting water quality in this densely populated area.
Environmental context
ST HELENS STW discharges into Sankey Brook, a tributary of the River Mersey, which flows into the Irish Sea. The Mersey Basin supports a variety of fish species and migratory birds, and the plant's treatment helps maintain water quality in this ecologically important estuary. The area is historically industrial, but recent improvements have enhanced biodiversity.
Frequently asked questions
ST HELENS STW is located in Sankey Valley Country Park, near Fingerpost, Blackbrook, St Helens, England, within the Liverpool City Region.
ST HELENS STW serves a population equivalent of 137,463, classifying it as a large agglomeration under UK wastewater regulations.
The treated effluent from ST HELENS STW is discharged into Sankey Brook, which flows into the River Mersey and then the Irish Sea.
ST HELENS STW operates under the UK's Environmental Permitting Regulations, which implement the EU Urban Waste Water Treatment Directive. The Environment Agency issues permits and enforces discharge standards.
For a large agglomeration like ST HELENS STW, secondary treatment is mandatory, and tertiary treatment is often required in sensitive areas to meet strict water quality standards.
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