Flood risk · Tongham

Flood risk for Tongham

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

Low

High

1.5%

Medium

Low

6.2%

Very low

Surface water flooding

Medium

High

2.1%

Medium

4.1%

Low

5.4%

Nearest watercourse

Blackwater River

A river, 524 m from the centre of Tongham

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 Tongham; 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.