Does RM11 flood?

Yes — parts of the RM11 district carry real flood risk: 2 of its 27 at-risk postcodes reach the Environment Agency's High likelihood band. The RM11 postcode district covers Emerson Park, Cranham, Squirrels Heath, St Andrew's, close to Upminster, Elm Park, Harold Wood, and surrounding villages in parts of England and Essex.

27 postcodes in the RM11 district appear in the Environment Agency's rivers-and-sea flood-risk dataset — worst bands: 2 high, 4 medium, 15 low, 6 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 RM11 postcodes are at risk?

Rivers and flooding history near RM11

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

Hornchurch_Bretons Farm on the River Beam — 3.7 km away, highest on record 1.67m
Harold Park on the River Ingrebourne — 3.9 km away, highest on record 3.13m
Romford on the River Rom — 4 km away, highest on record 1.15m
Collier Row on the River Rom — 5.8 km away, highest on record 1.86m

218 official flood warnings and alerts have been raised within ~10 km of the district's centre since 2006 (31 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):

January 2021 flooding — about 2.1 km from the centre
June 2016 flooding — about 1.4 km from the centre
February 2007 flooding — about 1.3 km from the centre
October 1992 flooding — about 1.7 km from the centre

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

🏠 Buying or renting in RM11? 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

RM10 RM12 RM13 RM9 RM14 RM15 RM7 RM16

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.