Flood Alert Issued for Groundwater Flooding in Alton Area, Hampshire

Alert Details

A flood alert has been issued by the Environment Agency for the Alton area in Hampshire. The alert was raised on March 17, 2026, at 7:37 AM following observations of high groundwater levels at the Farringdon borehole.

Affected Areas

The alert specifically covers the Alton area within the Thames region of Hampshire. Impacted locations include low-lying areas and roads near the Farringdon borehole that are susceptible to groundwater fluctuations.

What You Should Do

Residents in the affected area are advised to prepare property resilience measures. Those with water pumps installed should ensure they are in good working order. Motorists are urged to take particular care when driving through flood water, both for personal safety and to prevent bow waves from flooding adjacent properties.

Expected Conditions

Groundwater levels are currently reported as high but stable. However, the Environment Agency warns that levels remain highly sensitive to further rainfall. Flooding of low-lying land and local roadways is possible. Because groundwater responds slowly to environmental changes, these conditions are expected to be prolonged.

Timeline

The alert is effective immediately as of March 17, 2026. Due to the nature of groundwater flooding, the Environment Agency indicates this situation could continue for several weeks or longer. Officials are closely monitoring rainfall and borehole levels and will provide an update by 12:00 PM on March 24, 2026, or sooner if conditions change significantly.