WINEP case study: Thames Water (AMP7) Ex.1

Upgrading storm tank capacity at Hungerford Sewage Treatment Works to avoid sewage discharges

The Water Industry National Environment Programme (WINEP) is a cornerstone of environmental regulation in England, setting out the actions water companies must deliver to meet statutory obligations and contribute to wider environmental goals. AMP7, which covered 1 April 2020 to 31 March 2025, represented one of the most ambitious WINEP cycles to date, with over 11,900 actions aimed at improving water quality, protecting biodiversity, and supporting sustainable water resources. The case study below provides an example of one of the completed AMP7 projects.

Storm tank capacity at Hungerford Sewage Treatment (STW) works was increased from 342 m3 to 554 m3 to allow the redirection of flows to Hungerford (STW) and the decommissioning of Chilton Foliat Sewage Treatment Works.

The need to upgrade the existing storm tank capacity in the area was identified through hydraulic modelling, catchment growth projections, flow monitoring data, Environment Agency interventions, permit compliance, risk assessments and asset condition assessments.

Hungerford sewage treatment works


Hungerford sewage treatment worksImages of Hungerford Sewage Treatment Works



Upgrading storm tank capacity at Hungerford Sewage Treatment Works to avoid sewage discharges

The Water Industry National Environment Programme (WINEP) is a cornerstone of environmental regulation in England, setting out the actions water companies must deliver to meet statutory obligations and contribute to wider environmental goals. AMP7, which covered 1 April 2020 to 31 March 2025, represented one of the most ambitious WINEP cycles to date, with over 11,900 actions aimed at improving water quality, protecting biodiversity, and supporting sustainable water resources. The case study below provides an example of one of the completed AMP7 projects.

Storm tank capacity at Hungerford Sewage Treatment (STW) works was increased from 342 m3 to 554 m3 to allow the redirection of flows to Hungerford (STW) and the decommissioning of Chilton Foliat Sewage Treatment Works.

The need to upgrade the existing storm tank capacity in the area was identified through hydraulic modelling, catchment growth projections, flow monitoring data, Environment Agency interventions, permit compliance, risk assessments and asset condition assessments.

Hungerford sewage treatment works


Hungerford sewage treatment worksImages of Hungerford Sewage Treatment Works



Page published: 05 Feb 2026, 03:08 PM