Does SG1 flood?

Parts of the SG1 district carry moderate flood risk: 2 of its 19 at-risk postcodes reach the Environment Agency's Medium likelihood band. The SG1 postcode district covers Bedwell, Roebuck, Woodfield, Manor, close to Bragbury End, Walkern, Whitwell, and surrounding villages in Hertfordshire.

19 postcodes in the SG1 district appear in the Environment Agency's rivers-and-sea flood-risk dataset — worst bands: 2 medium, 17 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 SG1 postcodes are at risk?

SG1 1LA up to Medium SG1 1XN up to Medium SG1 1AA up to Low SG1 1AR up to Low SG1 1HE up to Low SG1 1HS up to Low SG1 1HT up to Low SG1 1HZ up to Low SG1 1TN up to Low SG1 1TP up to Low SG1 1TS up to Low SG1 1TU up to Low SG1 1TW up to Low SG1 1TX up to Low SG1 1TZ up to Low SG1 1XR up to Low SG1 1XW up to Low SG1 4FD up to Low SG1 4WP up to Low

Rivers and flooding history near SG1

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

Bragbury Park on the Stevenage Brook — 4.5 km away, highest on record 1.19m
Walkern on the River Beane — 5.6 km away, highest on record 1.49m
Whitwell on the River Mimram — 6.3 km away, highest on record 0.28m
Fulling Mill on the River Mimram — 7.2 km away, highest on record 0.55m

26 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
December 2013 flooding — about 3 km from the centre
October 1993 flooding — about 8.2 km from the centre
May 1992 flooding — about 1.8 km from the centre

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

🏠 Buying or renting in SG1? 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

SG2 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.