Does HP8 flood?

Yes — parts of the HP8 district carry real flood risk: 6 of its 6 at-risk postcodes reach the Environment Agency's High likelihood band. The HP8 postcode district covers Chalfont St Giles & Little Chalfont, close to Little Missenden, Rickmansworth, Chesham, and surrounding villages in parts of England and Buckinghamshire.

6 postcodes in the HP8 district appear in the Environment Agency's rivers-and-sea flood-risk dataset — worst bands: 6 high. 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 HP8 postcodes are at risk?

HP8 4NP up to High HP8 4NR up to High HP8 4QA up to High HP8 4QB up to High HP8 4QF up to High HP8 4RT up to High

Rivers and flooding history near HP8

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

Missenden on the River Misbourne — 7.1 km away, highest on record 0.46m
Chesham on the River Chess — 8 km away, highest on record 0.88m
Moor Lane on the River Colne — 8.9 km away, highest on record 8.23m
Croxley Green on the River Gade — 9.4 km away, highest on record 0.42m

20 official flood warnings and alerts have been raised within ~10 km of the district's centre since 2006 (3 at warning level or above), most recently 26 February 2025. Warnings cover flood areas, not individual addresses.

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

EA06FebruaryWinter2024 (2024) — about 0.4 km from the centre
February 2014 flooding — about 2.9 km from the centre
Winter 2013/2014 (2013) — about 23.1 km from the centre
October 2001 flooding — about 12.3 km from the centre

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

🏠 Buying or renting in HP8? 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

HP7 HP10 HP11 HP5 HP12 HP4 HP13 HP3

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.