FloodRadar
Log inCreate free account

Explore FloodRadar

Explore the map
Weather
Why ?

Does HP3 flood?

Yes — parts of the HP3 district carry real flood risk: 3 of its 44 at-risk postcodes reach the Environment Agency's High likelihood band. The HP3 postcode district covers Apsley and Corner Hall, Nash Mills, Gade Valley, Kings Langley, close to Hemel Hempstead, Redbourn, Watford, and surrounding villages in parts of Hertfordshire and Buckinghamshire.

44 postcodes in the HP3 district appear in the Environment Agency's rivers-and-sea flood-risk dataset — worst bands: 3 high, 17 low, 24 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 HP3 postcodes are at risk?

HP3 8RT up to High HP3 9FP up to High HP3 9RP up to High HP3 9AW up to Low HP3 9BX up to Low HP3 9BY up to Low HP3 9BZ up to Low HP3 9GQ up to Low HP3 9HN up to Low HP3 9RF up to Low HP3 9RG up to Low HP3 9RQ up to Low HP3 9RW up to Low HP3 9RY up to Low HP3 9RZ up to Low HP3 9SA up to Low HP3 9SB up to Low HP3 9SR up to Low HP3 9XY up to Low HP3 9YT up to Low HP3 9DD up to Very low HP3 9DG up to Very low HP3 9DH up to Very low HP3 9DP up to Very low HP3 9DR up to Very low HP3 9FS up to Very low HP3 9FX up to Very low HP3 9FY up to Very low HP3 9GA up to Very low HP3 9GD up to Very low HP3 9GH up to Very low HP3 9GP up to Very low HP3 9GU up to Very low HP3 9GX up to Very low HP3 9GY up to Very low HP3 9HH up to Very low HP3 9RJ up to Very low HP3 9TF up to Very low HP3 9WN up to Very low HP3 9WS up to Very low HP3 9WU up to Very low HP3 9WW up to Very low HP3 9XB up to Very low HP3 9XE up to Very low

Rivers and flooding history near HP3

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

23 official flood warnings and alerts have been raised within ~10 km of the district's centre since 2006 (5 at warning level or above), most recently 19 December 2024. Warnings cover flood areas, not individual addresses.

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

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

🏠 Buying or renting in HP3? 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

HP4 HP1 HP5 HP7 HP8 HP10 HP11 HP12

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.