Does AL8 flood?

Yes — parts of the AL8 district carry real flood risk: 3 of its 6 at-risk postcodes reach the Environment Agency's High likelihood band. The AL8 postcode district covers Hatfield Villages, Handside, close to Welwyn, Tewin, Birch Green, and surrounding villages in parts of Hertfordshire and Central Bedfordshire.

6 postcodes in the AL8 district appear in the Environment Agency's rivers-and-sea flood-risk dataset — worst bands: 3 high, 2 low, 1 very low. A postcode not listed here has no properties in any recorded risk band (which is good news, but never proof it cannot flood).

Free preview first · full report £19

Which AL8 postcodes are at risk?

AL8 7TN up to High AL8 7TR up to High AL8 7TW up to High AL8 6DR up to Low AL8 6XF up to Low AL8 6DF up to Very low

Rivers and flooding history near AL8

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

Fulling Mill on the River Mimram — 5 km away, highest on record 0.55m
Panshanger on the River Mimram — 6 km away, highest on record 1.28m
Waterhall on the River Lee — 7.8 km away, highest on record 1.16m
North Mymms on the Mimmshall Brook — 8.3 km away, highest on record 2.35m

157 official flood warnings and alerts have been raised within ~10 km of the district's centre since 2006 (10 at warning level or above), most recently 27 August 2026. Warnings cover flood areas, not individual addresses.

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

May 2007 flooding — about 6.4 km from the centre
September 1992 flooding — about 8.5 km from the centre
July 1987 flooding — about 2 km from the centre
May 1978 flooding — about 1.5 km from the centre

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

🏠 Buying or renting in AL8? 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

AL9 AL10 AL6 AL5 AL4 AL3 AL2 AL1

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.