Sewage: Waste Disposal

Department for Environment, Food and Rural Affairs written question – answered on 16th September 2020.

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Photo of James Wild James Wild Conservative, North West Norfolk

To ask the Secretary of State for Environment, Food and Rural Affairs, whether there is a threshold of the annual number of discharges by combined sewer outflows above which the Environment Agency is required to investigate.

Photo of Rebecca Pow Rebecca Pow The Parliamentary Under-Secretary of State for Environment, Food and Rural Affairs

The Environment Agency puts forward storm overflows that spill greater than a given threshold for investigation by water companies through the Water Industry National Environment Programme (WINEP).

The spill thresholds currently applied are shown in the table below and depend on the number of years of Event Duration Monitoring (EDM) data available. As more data becomes available a tighter threshold of spills per year is adopted.

In the period 2020-2025, 727 storm overflows are currently being investigated. As the provision of storm overflow monitoring data increases more overflows are being identified as crossing the spill thresholds and will be put forward for the WINEP. If the investigation shows that it is cost-beneficial to reduce spills, a scheme would be secured through the WINEP.

The Environment Agency also investigates storm overflows based on evidence of environmental impact and/or non-compliance with permit conditions.

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