Does SN1 flood?

Yes — parts of the SN1 district carry real flood risk: 3 of its 9 at-risk postcodes reach the Environment Agency's High likelihood band. The SN1 postcode district covers Wroughton and Wichelstowe, St Margaret and South Marston, close to Swindon, Haydon Wick, Stratton St Margaret, and surrounding villages in parts of Wiltshire and Swindon.

9 postcodes in the SN1 district appear in the Environment Agency's rivers-and-sea flood-risk dataset — worst bands: 3 high, 2 medium, 4 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 SN1 postcodes are at risk?

SN1 4AP up to High SN1 4NQ up to High SN1 5ES up to High SN1 2RA up to Medium SN1 2RD up to Medium SN1 2PA up to Low SN1 7EL up to Low SN1 7HG up to Low SN1 7NU up to Low

Rivers and flooding history near SN1

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

Rushey Platt on the River Ray — 1.1 km away, highest on record 2.19m
Rodbourne on the River Ray — 2.5 km away, highest on record 2.46m
Lower Stratton on the River Cole — 3.9 km away, highest on record 4.30m
Kestrel Drive on the Dorcan Brook — 4.6 km away, highest on record 3.08m

327 official flood warnings and alerts have been raised within ~10 km of the district's centre since 2006 (6 at warning level or above), most recently 29 August 2026. Warnings cover flood areas, not individual addresses.

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

Westlea_Fluvial Water (2007) — about 2.2 km from the centre
Westlea_Surface Water (2007) — about 2.3 km from the centre
Rodbourne_fluvial (2006) — about 2.5 km from the centre
June 1971 flooding — about 2.4 km from the centre

🏠 Buying or renting in SN1? 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

SN2 SN3 SN4 SN5 SN6 SN7 SN8 SN9

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.