Southern Water says it is stepping up its response across Hampshire, Sussex and Kent as persistent heavy rain continues to drive groundwater levels higher, increasing the risk of flooding and pollution.
The company says nearly 80 tankers are now operating across 26 sites to help keep water flowing through the sewer network and reduce pressure on already strained systems. Crews are being deployed around the clock as conditions remain challenging, even after the worst of the rainfall has passed.
Several communities are currently affected by flooding linked to rising groundwater, including Hambledon, Sidlesham, Charlton, Shripney and Walberton. Southern Water says these issues can last for weeks or even months, particularly in areas with chalk geology.
Groundwater flooding typically affects communities built on chalk aquifers, which act like giant sponges. They absorb large amounts of rain and then release it slowly over time. As the water table rises, water is pushed back towards the surface and into sewer pipes and manholes, reducing capacity and placing continued strain on wastewater networks long after storms have ended.
Alongside emergency tanker operations, Southern Water says it is also focusing on long-term solutions by sealing sewers to prevent groundwater from entering the system in the first place.
In West Sussex, more than 15 kilometres of sewers have already been sealed across Singleton, Charlton and East Dean, with work now progressing into West Dean. Additional sealing is also taking place at Funtington and Bosham, helping to protect the River Lavant and Chichester Harbour.
In Hampshire, a £3.5 million programme is underway in Penton Mewsey and Appleshaw near Andover, sealing over 15.5 kilometres of sewer. The work is being phased to limit disruption and is due to be completed by autumn 2026.
Meanwhile in Kent, a £3 million scheme in Sittingbourne is sealing 4.2 kilometres of sewer pipe.
George Taylor, Southern Water's Director for Wastewater Operations, said:
“We’re sorry for the impact our tankers and emergency works can have, but please know they’re there to protect homes, businesses and the environment. This is some of the wettest weather we’ve ever seen, driving groundwater to exceptional levels. Our teams are out day and night, and our goal is to keep our communities safe.”
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