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Does SW20 flood?

Yes — parts of the SW20 district carry real flood risk: 23 of its 41 at-risk postcodes reach the Environment Agency's High likelihood band. The SW20 postcode district covers West Barnes, Raynes Park, Lower Morden, Coombe Hill, close to New Malden, Morden, Worcester Park, and surrounding villages in parts of Greater London and Surrey.

41 postcodes in the SW20 district appear in the Environment Agency's rivers-and-sea flood-risk dataset — worst bands: 23 high, 4 medium, 14 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 SW20 postcodes are at risk?

SW20 0AJ up to High SW20 0AL up to High SW20 0AW up to High SW20 0JH up to High SW20 0JL up to High SW20 9AX up to High SW20 9AZ up to High SW20 9BH up to High SW20 9BQ up to High SW20 9DS up to High SW20 9HZ up to High SW20 9JA up to High SW20 9LL up to High SW20 9LN up to High SW20 9LP up to High SW20 9LR up to High SW20 9LS up to High SW20 9LT up to High SW20 9LU up to High SW20 9LX up to High SW20 9NA up to High SW20 9NL up to High SW20 9PB up to High SW20 0AG up to Medium SW20 0AQ up to Medium SW20 0RQ up to Medium SW20 9AT up to Medium SW20 0AA up to Low SW20 0AH up to Low SW20 0AN up to Low SW20 0RL up to Low SW20 0SR up to Low SW20 0SS up to Low SW20 9HH up to Low SW20 9HJ up to Low SW20 9LW up to Low SW20 9NB up to Low SW20 9NE up to Low SW20 9NH up to Low SW20 9NJ up to Low SW20 9NQ up to Low

Rivers and flooding history near SW20

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

1,465 official flood warnings and alerts have been raised within ~10 km of the district's centre since 2006 (34 at warning level or above), most recently 29 September 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 SW20? 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

SW19 SW18 SW17 SW16 SW15 SW14 SW13 SW11

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.