Latest GW Flooding Briefing

We attach our Groundwater Briefing Note for Hampshire.

During January and February, groundwater levels across Hampshire have risen significantly quickly in response to the very wet weather. In all communities, groundwater levels are now above average for the time of year. The exception being the far north of Hampshire, near Basingstoke. At almost all groundwater boreholes, levels are continuing to rise.

Groundwater flooding impacts are occurring in many susceptible communities across Hampshire. Groundwater is thought to be affecting cellars, roads, and gardens. Impacts to sewerage systems and septic tanks are also ongoing.

Further rainfall is forecast to affect Hampshire over the next five days. Long range forecasting is difficult, but the current suggestion is that mild and wet conditions will continue throughout the second half of February 2026. Unsettled weather could possibly continue into the first half of March 2026 too.

Groundwater levels are expected to rise in most communities throughout February 2026. Groundwater flooding impacts are probable in most communities that have previously experienced groundwater flooding.

If you have pumps to help manage water levels in cellars, or any other flood resilience measures to reduce impacts, you may like to check that they are operational.

We will update this Groundwater Briefing Note on Friday 13 March 2026.