Infiltration Reduction Plans

These plans continue to reduce the risk of groundwater entering public and private sewers and drains.

About groundwater infiltration

Groundwater infiltration occurs when groundwater finds its way into the underground water and sewerage system, which can result in sewer flooding.

We proactively monitor, inspect and line sewers to identify and reduce infiltration. We also work with partners, including the Environment Agency, councils and customers, to reduce infiltration and inflows across the wider drainage network, such as private sewers and highway drains.

Learn more about how groundwater causes sewer flooding.

Infiltration Reduction Plan Summaries

Our Infiltration Reduction Plan Summaries provide an update on our priority catchments, what we are doing to reduce groundwater infiltration, and how each area is performing.

View our regional Groundwater Infiltration Reduction Plan Summary which covers all our catchments.

For more information about each area, see our individual plan summaries below: