Does RM4 flood?

Yes — parts of the RM4 district carry real flood risk: 7 of its 15 at-risk postcodes reach the Environment Agency's High likelihood band. The RM4 postcode district covers Chigwell with Lambourne, Theydon Bois with Passingford, Brizes, Stondon Massey & South Weald, Havering-atte-Bower, close to Abridge, Navestock Heath, Loughton, and surrounding villages in parts of England and Essex.

15 postcodes in the RM4 district appear in the Environment Agency's rivers-and-sea flood-risk dataset — worst bands: 7 high, 5 medium, 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).

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Which RM4 postcodes are at risk?

RM4 1EX up to High RM4 1ST up to High RM4 1UA up to High RM4 1UD up to High RM4 1UH up to High RM4 1UJ up to High RM4 1YA up to High RM4 1BN up to Medium RM4 1EF up to Medium RM4 1EJ up to Medium RM4 1RT up to Medium RM4 1UB up to Medium RM4 1FG up to Low RM4 1RD up to Low RM4 1UL up to Very low

Rivers and flooding history near RM4

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

Abridge on the River Roding — 2.2 km away, highest on record 2.68m
Shonks Mill Bridge on the River Roding — 4.3 km away, highest on record 2.39m
Loughton on the River Roding — 4.8 km away, highest on record 1.86m
Collier Row on the River Rom — 5.7 km away, highest on record 1.86m

137 official flood warnings and alerts have been raised within ~10 km of the district's centre since 2006 (15 at warning level or above), most recently 16 February 2026. Warnings cover flood areas, not individual addresses.

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

December 2019 flooding — about 1.4 km from the centre
June 2016 flooding — about 2.3 km from the centre
January 2015 flooding — about 2.4 km from the centre
February 2014 flooding — about 2.2 km from the centre

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

🏠 Buying or renting in RM4? 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

RM3 RM5 RM2 RM6 RM1 RM7 RM9 RM10

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.