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Does CB21 flood?

Yes — parts of the CB21 district carry real flood risk: 17 of its 30 at-risk postcodes reach the Environment Agency's High likelihood band. The CB21 postcode district covers Linton, Balsham, Ashdon, Fen Ditton & Fulbourn, close to Babraham, Great Chesterford, Stapleford, and surrounding villages in parts of Cambridgeshire and Essex.

30 postcodes in the CB21 district appear in the Environment Agency's rivers-and-sea flood-risk dataset — worst bands: 17 high, 7 medium, 6 low. A postcode not listed here has no properties in any recorded risk band (which is good news, but never proof it cannot flood).

Free preview first · full report £19

Which CB21 postcodes are at risk?

CB21 4HE up to High CB21 4NR up to High CB21 4NT up to High CB21 4NU up to High CB21 4PT up to High CB21 4PW up to High CB21 4RR up to High CB21 4TP up to High CB21 5LG up to High CB21 5NE up to High CB21 6AN up to High CB21 6BG up to High CB21 6BJ up to High CB21 6BL up to High CB21 6BS up to High CB21 6BU up to High CB21 6GP up to High CB21 4HS up to Medium CB21 4HX up to Medium CB21 4JY up to Medium CB21 4RH up to Medium CB21 5PF up to Medium CB21 6AB up to Medium CB21 6AE up to Medium CB21 4HT up to Low CB21 4JD up to Low CB21 4JX up to Low CB21 4PP up to Low CB21 4RG up to Low CB21 5NS up to Low

Rivers and flooding history near CB21

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

35 official flood warnings and alerts have been raised within ~10 km of the district's centre since 2006, most recently 27 January 2026. Warnings cover flood areas, not individual addresses.

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

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

🏠 Buying or renting in CB21? 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

CB22 CB23 CB24 CB25 CB11 CB10 CB9 CB8

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.