Does RG18 flood?

Yes — parts of the RG18 district carry real flood risk: 16 of its 24 at-risk postcodes reach the Environment Agency's High likelihood band. The RG18 postcode district covers Thatcham West, Ridgeway, Thatcham North East, Newbury Clay Hill, close to Frilsham, Bucklebury, Shaw, and surrounding villages in parts of West Berkshire and Oxfordshire.

24 postcodes in the RG18 district appear in the Environment Agency's rivers-and-sea flood-risk dataset — worst bands: 16 high, 1 medium, 7 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 RG18 postcodes are at risk?

Rivers and flooding history near RG18

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

Shaw on the River Lambourn — 4.7 km away, highest on record 2.10m
Newbury on the River Kennet — 5.3 km away, highest on record 1.61m
Bagnor on the Winterbourne Stream — 6.5 km away, highest on record 0.55m
Chapel Wood on the Groundwater Level — 8.1 km away, highest on record 114.47m

187 official flood warnings and alerts have been raised within ~10 km of the district's centre since 2006 (16 at warning level or above), most recently 6 April 2026. Warnings cover flood areas, not individual addresses.

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

Winter 2013/2014 (2013) — about 29.7 km from the centre
Bucklebury_Fluvial (2009) — about 3.1 km from the centre
October 1993 flooding — about 3 km from the centre
September 1992 flooding — about 2.9 km from the centre

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

🏠 Buying or renting in RG18? 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

RG17 RG19 RG20 RG21 RG14 RG22 RG12 RG24

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.