Flood risk · Dorchester

Flood risk for Dorchester

Indicative risk for the kilometre square around the centre, from the Environment Agency’s national flood risk assessment. Always check a specific property address on the official map before buying or building.

River & sea flooding

High

18.9%

Medium

Low

0.8%

Very low

Surface water flooding

Low

High

1.6%

Medium

1.2%

Low

2.3%

Nearest watercourse

River Frome

A river, 258 m from the centre of Dorchester

For a property-specific flood risk check, use the official Environment Agency service at check-long-term-flood-risk.service.gov.uk.

Environment Agency National Flood Risk Assessment (NaFRA2, January 2025): the level shown is the highest risk that applies to at least 5% of the 1 km square centred on Dorchester; bars show each level’s share of that square. Nearest named watercourse from OS Open Rivers. Contains Environment Agency and Ordnance Survey data, Open Government Licence.