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Flooding inside your property


Internal and external sewer flooding is caused when sewers become overloaded as a result of severe weather, equipment failure, blockages or sewer collapses. 

Internal sewer flooding is one of the most distressing service failures for a customer and reducing it is a very high customer priority.

Flooding caused by assets which are beyond the our control is excluded, eg, fluvial and coastal flooding.

Unit of measurement

Forecast for 2020

2025 target 

Number per 10,000 sewer connections


Less than 1.35