Does RH4 flood?

Yes — parts of the RH4 district carry real flood risk: 24 of its 46 at-risk postcodes reach the Environment Agency's High likelihood band. The RH4 postcode district covers Mickleham, Westcott & Okewood, Brockham, Betchworth, Buckland, Box Hill & Headley, close to Dorking, Leatherhead, Sidlow, and surrounding villages in parts of Surrey and West Sussex.

46 postcodes in the RH4 district appear in the Environment Agency's rivers-and-sea flood-risk dataset — worst bands: 24 high, 7 medium, 12 low, 3 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).

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Which RH4 postcodes are at risk?

RH4 1BJ up to High RH4 1DL up to High RH4 1DQ up to High RH4 1DR up to High RH4 1EH up to High RH4 1EJ up to High RH4 1EL up to High RH4 1EN up to High RH4 1EW up to High RH4 1JE up to High RH4 1JG up to High RH4 1LD up to High RH4 1LH up to High RH4 1NY up to High RH4 1PL up to High RH4 1PQ up to High RH4 1UA up to High RH4 1UB up to High RH4 1UE up to High RH4 1UG up to High RH4 1XA up to High RH4 1XF up to High RH4 3LQ up to High RH4 3LY up to High RH4 1BX up to Medium RH4 1DH up to Medium RH4 1DX up to Medium RH4 1LJ up to Medium RH4 1NN up to Medium RH4 1TD up to Medium RH4 3PX up to Medium RH4 1AH up to Low RH4 1DY up to Low RH4 1EA up to Low RH4 1EP up to Low RH4 1GU up to Low RH4 1HJ up to Low RH4 1JH up to Low RH4 1JQ up to Low RH4 1PH up to Low RH4 1PR up to Low RH4 3LR up to Low RH4 3NY up to Low RH4 1ER up to Very low RH4 1JJ up to Very low RH4 3LT up to Very low

Rivers and flooding history near RH4

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

Leatherhead on the River Mole — 6.7 km away, highest on record 3.74m
Kinnersley Manor on the River Mole — 10.5 km away, highest on record 3.50m
Chipstead on the Groundwater Level — 11 km away, highest on record 106.78m
Downside Bridge on the River Mole — 11.3 km away, highest on record 3.46m

218 official flood warnings and alerts have been raised within ~10 km of the district's centre since 2006 (43 at warning level or above), most recently 15 February 2026. Warnings cover flood areas, not individual addresses.

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

BoxHill_Dec2013 (2013) — about 2.2 km from the centre
Brockham_Dec2013 (2013) — about 3.3 km from the centre
Dorking2_Dec2013 (2013) — about 0.7 km from the centre
Pixham1_Dec2013 (2013) — about 2.3 km from the centre

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

🏠 Buying or renting in RH4? 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

RH3 RH5 RH2 RH6 RH1 RH7 RH8 RH9

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.