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Does SG18 flood?

Yes — parts of the SG18 district carry real flood risk: 23 of its 57 at-risk postcodes reach the Environment Agency's High likelihood band. The SG18 postcode district covers Northill, Clifton, Henlow & Langford, close to Biggleswade, Arlesey, Shefford, and surrounding villages in parts of Central Bedfordshire and Bedford.

57 postcodes in the SG18 district appear in the Environment Agency's rivers-and-sea flood-risk dataset — worst bands: 23 high, 14 medium, 17 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).

Free preview first · full report £19

Which SG18 postcodes are at risk?

SG18 0AG up to High SG18 0EP up to High SG18 8AZ up to High SG18 8DU up to High SG18 8DX up to High SG18 8DZ up to High SG18 8EA up to High SG18 8HE up to High SG18 8HF up to High SG18 8HG up to High SG18 8HQ up to High SG18 9AB up to High SG18 9BB up to High SG18 9DU up to High SG18 9ED up to High SG18 9JH up to High SG18 9JT up to High SG18 9JX up to High SG18 9JZ up to High SG18 9LZ up to High SG18 9RZ up to High SG18 9SA up to High SG18 9SD up to High SG18 0AB up to Medium SG18 0AW up to Medium SG18 0NA up to Medium SG18 8BN up to Medium SG18 9AY up to Medium SG18 9BE up to Medium SG18 9GG up to Medium SG18 9GH up to Medium SG18 9JU up to Medium SG18 9RL up to Medium SG18 9RU up to Medium SG18 9RW up to Medium SG18 9RY up to Medium SG18 9SE up to Medium SG18 0AE up to Low SG18 0AN up to Low SG18 0BB up to Low SG18 8HH up to Low SG18 8YQ up to Low SG18 8YR up to Low SG18 9AQ up to Low SG18 9BJ up to Low SG18 9BS up to Low SG18 9EH up to Low SG18 9FB up to Low SG18 9GQ up to Low SG18 9NX up to Low SG18 9QB up to Low SG18 9QY up to Low SG18 9RE up to Low SG18 9UR up to Low SG18 9JY up to Very low SG18 9QX up to Very low SG18 9RA up to Very low

Rivers and flooding history near SG18

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

61 official flood warnings and alerts have been raised within ~10 km of the district's centre since 2006 (29 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):

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

🏠 Buying or renting in SG18? 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

SG17 SG19 SG16 SG15 SG14 SG13 SG12 SG11

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.