Does SG2 flood?

Yes — parts of the SG2 district carry real flood risk: 2 of its 35 at-risk postcodes reach the Environment Agency's High likelihood band. The SG2 postcode district covers Roebuck, Aston, Datchworth & Walkern, Longmeadow, The Mundens, close to Bragbury End, Walkern, Welwyn, and surrounding villages in Hertfordshire.

35 postcodes in the SG2 district appear in the Environment Agency's rivers-and-sea flood-risk dataset — worst bands: 2 high, 10 medium, 23 low. A postcode not listed here has no properties in any recorded risk band (which is good news, but never proof it cannot flood).

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Which SG2 postcodes are at risk?

Rivers and flooding history near SG2

The rivers that matter here, each monitored live on FloodRadar:

Bragbury Park on the Stevenage Brook — 2.1 km away, highest on record 1.19m
Walkern on the River Beane — 4.4 km away, highest on record 1.49m
Fulling Mill on the River Mimram — 7 km away, highest on record 0.55m
Dane End on the River Beane — 7.3 km away, highest on record 1.77m

22 official flood warnings and alerts have been raised within ~10 km of the district's centre since 2006 (4 at warning level or above), most recently 8 January 2026. Warnings cover flood areas, not individual addresses.

Recorded flood extents near the district (Environment Agency record):

July 2015 flooding — about 1.9 km from the centre
February 2014 flooding — about 3.4 km from the centre
December 2013 flooding — about 0.6 km from the centre
October 1993 flooding — about 5.8 km from the centre

Records, not floods: no outline on the record is not evidence a place has not flooded.

🏠 Buying or renting in SG2? The full property flood-risk report covers any postcode here — the official likelihood band, every recorded flood nearby with distances, warning history year by year, how the local rivers behave, and an insurance outlook, print-ready for £19. See what's in the report →

Flood risk in nearby postcode districts

SG1 SG4 SG5 SG6 SG7 SG8 SG9 SG10

Band = the worst likelihood band of any property in that postcode (EA Risk of Flooding from Rivers & Sea, defence-adjusted, area-level). Check any postcode in detail — or get the full £19 property report — at the property flood-risk report. © Environment Agency copyright and/or database right 2025. All rights reserved. Some features of this map are based on digital spatial data from the Centre for Ecology & Hydrology, © NERC (CEH). © Crown Copyright and Database Rights 2025 OS AC0000807064. This product is produced in part from PAF® and Multiple Residence Data, the copyright in which is owned by Royal Mail Group Limited and/or Royal Mail Group plc. All rights reserved. Licence number AC0000807064.