Does SW18 flood?

Yes — parts of the SW18 district carry real flood risk: 59 of its 330 at-risk postcodes reach the Environment Agency's High likelihood band. The SW18 postcode district covers Wandsworth Town, Wandle, Southfields, Wandsworth Common, close to Merton, Barnes, Kingston Vale, and surrounding villages in parts of Greater London and Surrey.

330 postcodes in the SW18 district appear in the Environment Agency's rivers-and-sea flood-risk dataset — worst bands: 59 high, 99 medium, 147 low, 25 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).

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Which SW18 postcodes are at risk?

SW18 1ER up to High SW18 1LP up to High SW18 1PS up to High SW18 2GJ up to High SW18 4AS up to High SW18 4AT up to High SW18 4AX up to High SW18 4AZ up to High SW18 4DJ up to High SW18 4DN up to High SW18 4EF up to High SW18 4EL up to High SW18 4EN up to High SW18 4EP up to High SW18 4ER up to High SW18 4EW up to High SW18 4GA up to High SW18 4GB up to High SW18 4GD up to High SW18 4LN up to High SW18 4LR up to High SW18 4LT up to High SW18 4LW up to High SW18 4LY up to High SW18 4LZ up to High SW18 4NU up to High SW18 4NW up to High SW18 4PU up to High SW18 4PX up to High SW18 4PY up to High SW18 4PZ up to High SW18 4QA up to High SW18 4QB up to High SW18 4QD up to High SW18 4QE up to High SW18 4QF up to High SW18 4QL up to High SW18 4QR up to High SW18 4QT up to High SW18 4QW up to High SW18 4QX up to High SW18 4QZ up to High SW18 4RA up to High SW18 4RB up to High SW18 4RE up to High SW18 4RL up to High SW18 4RQ up to High SW18 4RS up to High SW18 4RU up to High SW18 4RW up to High SW18 4RX up to High SW18 4RY up to High SW18 4SA up to High SW18 4SB up to High SW18 4SH up to High SW18 4SJ up to High SW18 4SN up to High SW18 4UH up to High SW18 4UQ up to High SW18 1BF up to Medium SW18 1EP up to Medium SW18 1ES up to Medium SW18 1ET up to Medium SW18 1EU up to Medium SW18 1EY up to Medium SW18 1EZ up to Medium SW18 1HF up to Medium SW18 1HH up to Medium SW18 1HJ up to Medium SW18 1HP up to Medium SW18 1HQ up to Medium SW18 1HW up to Medium SW18 1HZ up to Medium SW18 1JA up to Medium SW18 2BE up to Medium SW18 3BG up to Medium SW18 3BJ up to Medium SW18 3BN up to Medium SW18 3BQ up to Medium SW18 3DG up to Medium SW18 3DL up to Medium SW18 3EB up to Medium SW18 3EE up to Medium SW18 3EF up to Medium SW18 3EG up to Medium SW18 3EJ up to Medium SW18 3EL up to Medium SW18 3EQ up to Medium SW18 4BF up to Medium SW18 4BP up to Medium SW18 4BS up to Medium SW18 4BW up to Medium SW18 4DA up to Medium SW18 4DF up to Medium SW18 4DL up to Medium SW18 4DP up to Medium SW18 4DQ up to Medium SW18 4DR up to Medium SW18 4DS up to Medium SW18 4DT up to Medium SW18 4DX up to Medium SW18 4DY up to Medium SW18 4EA up to Medium SW18 4ED up to Medium SW18 4EE up to Medium SW18 4EH up to Medium SW18 4EJ up to Medium SW18 4ES up to Medium SW18 4ET up to Medium SW18 4FQ up to Medium SW18 4FR up to Medium SW18 4FW up to Medium SW18 4FY up to Medium SW18 4GJ up to Medium SW18 4GP up to Medium SW18 4GQ up to Medium SW18 4GS up to Medium SW18 4HU up to Medium SW18 4HY up to Medium SW18 4HZ up to Medium SW18 4JA up to Medium SW18 4JB up to Medium SW18 4JG up to Medium SW18 4JS up to Medium SW18 4JT up to Medium SW18 4JY up to Medium SW18 4LA up to Medium SW18 4LB up to Medium SW18 4LJ up to Medium SW18 4LL up to Medium SW18 4LU up to Medium SW18 4LX up to Medium SW18 4NL up to Medium SW18 4NN up to Medium SW18 4NP up to Medium SW18 4NR up to Medium SW18 4NS up to Medium SW18 4NT up to Medium SW18 4NX up to Medium SW18 4NY up to Medium SW18 4PT up to Medium SW18 4QN up to Medium SW18 4RR up to Medium SW18 4RZ up to Medium SW18 4SD up to Medium SW18 4SF up to Medium SW18 4SL up to Medium SW18 4SW up to Medium SW18 4TF up to Medium SW18 4TG up to Medium SW18 4TQ up to Medium SW18 4UD up to Medium SW18 4UJ up to Medium SW18 4UL up to Medium SW18 4UN up to Medium SW18 4UR up to Medium SW18 4UT up to Medium SW18 4UW up to Medium SW18 1AF up to Low SW18 1AH up to Low SW18 1AJ up to Low SW18 1AL up to Low SW18 1AP up to Low SW18 1AQ up to Low SW18 1AU up to Low SW18 1AW up to Low SW18 1AY up to Low SW18 1BT up to Low SW18 1BW up to Low SW18 1BY up to Low SW18 1DA up to Low SW18 1DT up to Low SW18 1DU up to Low SW18 1DX up to Low SW18 1EG up to Low SW18 1GR up to Low SW18 1GS up to Low SW18 1GY up to Low SW18 1HL up to Low SW18 1HN up to Low SW18 1JT up to Low SW18 1LA up to Low SW18 1LD up to Low SW18 1QS up to Low SW18 1QT up to Low SW18 1QZ up to Low SW18 1SF up to Low SW18 1SH up to Low SW18 1SL up to Low SW18 1SN up to Low SW18 1SP up to Low SW18 1SR up to Low SW18 1SS up to Low SW18 1SU up to Low SW18 1SW up to Low SW18 1SZ up to Low SW18 1TB up to Low SW18 1TD up to Low SW18 1TE up to Low SW18 1TF up to Low SW18 1TG up to Low SW18 1TH up to Low SW18 1TJ up to Low SW18 1TN up to Low SW18 1TP up to Low SW18 1TQ up to Low SW18 1UA up to Low SW18 1UD up to Low SW18 1UH up to Low SW18 1UJ up to Low SW18 1UL up to Low SW18 1UN up to Low SW18 1UP up to Low SW18 1UQ up to Low SW18 1UR up to Low SW18 1UY up to Low SW18 1XY up to Low SW18 1YL up to Low SW18 2BN up to Low SW18 2BP up to Low SW18 2BT up to Low SW18 2BU up to Low SW18 2BW up to Low SW18 2LL up to Low SW18 2PT up to Low SW18 3AH up to Low SW18 3BL up to Low SW18 3BP up to Low SW18 3BS up to Low SW18 3BW up to Low SW18 3DY up to Low SW18 3DZ up to Low SW18 3EA up to Low SW18 3ED up to Low SW18 3EH up to Low SW18 3NY up to Low SW18 3NZ up to Low SW18 3TE up to Low SW18 3TF up to Low SW18 3TG up to Low SW18 3TH up to Low SW18 4AD up to Low SW18 4AG up to Low SW18 4AH up to Low SW18 4AN up to Low SW18 4AP up to Low SW18 4AQ up to Low SW18 4AU up to Low SW18 4AY up to Low SW18 4BA up to Low SW18 4BB up to Low SW18 4BD up to Low SW18 4BE up to Low SW18 4BG up to Low SW18 4BH up to Low SW18 4BJ up to Low SW18 4BN up to Low SW18 4BQ up to Low SW18 4BT up to Low SW18 4DB up to Low SW18 4DD up to Low SW18 4DH up to Low SW18 4DU up to Low SW18 4DW up to Low SW18 4EB up to Low SW18 4EQ up to Low SW18 4EX up to Low SW18 4FT up to Low SW18 4GG up to Low SW18 4GL up to Low SW18 4GN up to Low SW18 4GW up to Low SW18 4GZ up to Low SW18 4HF up to Low SW18 4HG up to Low SW18 4HH up to Low SW18 4HQ up to Low SW18 4HT up to Low SW18 4JF up to Low SW18 4JP up to Low SW18 4LD up to Low SW18 4LH up to Low SW18 4NJ up to Low SW18 4NZ up to Low SW18 4PB up to Low SW18 4PD up to Low SW18 4PN up to Low SW18 4QS up to Low SW18 4RN up to Low SW18 4SQ up to Low SW18 4SR up to Low SW18 4TE up to Low SW18 4TS up to Low SW18 4TT up to Low SW18 4TW up to Low SW18 4TX up to Low SW18 4TY up to Low SW18 4TZ up to Low SW18 4XF up to Low SW18 4XG up to Low SW18 4XH up to Low SW18 5JS up to Low SW18 5LB up to Low SW18 5LD up to Low SW18 9TE up to Low SW18 1AZ up to Very low SW18 1PP up to Very low SW18 1PR up to Very low SW18 3QF up to Very low SW18 3QN up to Very low SW18 3QR up to Very low SW18 3SY up to Very low SW18 3SZ up to Very low SW18 3TB up to Very low SW18 4EG up to Very low SW18 4EU up to Very low SW18 4EZ up to Very low SW18 4GY up to Very low SW18 4HA up to Very low SW18 4HB up to Very low SW18 4HE up to Very low SW18 4HJ up to Very low SW18 4HL up to Very low SW18 4HN up to Very low SW18 4HP up to Very low SW18 4HR up to Very low SW18 4HW up to Very low SW18 4ST up to Very low SW18 4SU up to Very low SW18 4SX up to Very low

Rivers and flooding history near SW18

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

Summerstown on the River Wandle — 2.4 km away, highest on record 3.23m
Wandle Park Main Channel on the River Wandle — 3.5 km away, highest on record 2.00m
Wandle Park Side Channel on the River Wandle — 3.5 km away, highest on record 1.24m
Barnes on the Beverley Brook — 4.3 km away, highest on record 2.03m

1,473 official flood warnings and alerts have been raised within ~10 km of the district's centre since 2006 (11 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):

TTD_FEO_1928 (1928) — about 8.9 km from the centre

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

🏠 Buying or renting in SW18? 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

SW17 SW19 SW16 SW20 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.