Does SO40 flood?

Yes — parts of the SO40 district carry real flood risk: 85 of its 189 at-risk postcodes reach the Environment Agency's High likelihood band. The SO40 postcode district covers Marchwood & Eling, Ashurst, Bramshaw, Copythorne & Netley Marsh, close to Totton, Ashurst Bridge, Nursling, and surrounding villages in Hampshire.

189 postcodes in the SO40 district appear in the Environment Agency's rivers-and-sea flood-risk dataset — worst bands: 85 high, 20 medium, 73 low, 11 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 SO40 postcodes are at risk?

SO40 2AY up to High SO40 2FF up to High SO40 2FH up to High SO40 2GT up to High SO40 2GU up to High SO40 2LF up to High SO40 2LH up to High SO40 2LW up to High SO40 2LZ up to High SO40 2NL up to High SO40 2NN up to High SO40 2NP up to High SO40 2NW up to High SO40 2NX up to High SO40 2NY up to High SO40 2NZ up to High SO40 2PL up to High SO40 2QA up to High SO40 2QB up to High SO40 2QD up to High SO40 2QF up to High SO40 2RA up to High SO40 2RX up to High SO40 2SR up to High SO40 2SU up to High SO40 2TJ up to High SO40 2TL up to High SO40 2TN up to High SO40 2UJ up to High SO40 2UN up to High SO40 2UR up to High SO40 2UT up to High SO40 2UU up to High SO40 2UW up to High SO40 3AA up to High SO40 3AB up to High SO40 3LR up to High SO40 3LS up to High SO40 3LT up to High SO40 3LU up to High SO40 3NE up to High SO40 3PB up to High SO40 3PL up to High SO40 3QS up to High SO40 4AF up to High SO40 4AH up to High SO40 4AR up to High SO40 4AU up to High SO40 4BD up to High SO40 4BE up to High SO40 4BL up to High SO40 4LB up to High SO40 4SD up to High SO40 4SY up to High SO40 4UD up to High SO40 4UR up to High SO40 4UX up to High SO40 4WT up to High SO40 4WW up to High SO40 4XE up to High SO40 4XG up to High SO40 4XS up to High SO40 4ZD up to High SO40 7AD up to High SO40 7AH up to High SO40 7AJ up to High SO40 7DZ up to High SO40 7EA up to High SO40 7LA up to High SO40 8AE up to High SO40 8DX up to High SO40 8GQ up to High SO40 8XX up to High SO40 9BN up to High SO40 9FU up to High SO40 9GD up to High SO40 9GH up to High SO40 9GJ up to High SO40 9GN up to High SO40 9GQ up to High SO40 9GT up to High SO40 9HB up to High SO40 9HD up to High SO40 9HF up to High SO40 9PJ up to High SO40 2LL up to Medium SO40 2PB up to Medium SO40 2QZ up to Medium SO40 4AD up to Medium SO40 4AL up to Medium SO40 4AQ up to Medium SO40 4AS up to Medium SO40 4AW up to Medium SO40 4AX up to Medium SO40 4BX up to Medium SO40 4LE up to Medium SO40 4SQ up to Medium SO40 4UY up to Medium SO40 4WU up to Medium SO40 7AU up to Medium SO40 7AW up to Medium SO40 7BB up to Medium SO40 7HX up to Medium SO40 9GG up to Medium SO40 9GW up to Medium SO40 2AW up to Low SO40 2AZ up to Low SO40 2BE up to Low SO40 2GL up to Low SO40 2GQ up to Low SO40 2GR up to Low SO40 2HN up to Low SO40 2LP up to Low SO40 2LY up to Low SO40 2NQ up to Low SO40 2NU up to Low SO40 2PA up to Low SO40 2QE up to Low SO40 2QJ up to Low SO40 2RQ up to Low SO40 2SF up to Low SO40 2SZ up to Low SO40 2TW up to Low SO40 3DG up to Low SO40 3DN up to Low SO40 3DR up to Low SO40 3GS up to Low SO40 3HE up to Low SO40 3HF up to Low SO40 3HT up to Low SO40 3HU up to Low SO40 3LE up to Low SO40 3LF up to Low SO40 3LG up to Low SO40 3NR up to Low SO40 3NT up to Low SO40 3NU up to Low SO40 3PP up to Low SO40 3PQ up to Low SO40 3PR up to Low SO40 3PS up to Low SO40 3PT up to Low SO40 3PU up to Low SO40 3PW up to Low SO40 3WX up to Low SO40 4AG up to Low SO40 4AJ up to Low SO40 4AN up to Low SO40 4AP up to Low SO40 4AT up to Low SO40 4BJ up to Low SO40 4JX up to Low SO40 4SE up to Low SO40 4UB up to Low SO40 4WH up to Low SO40 4XR up to Low SO40 4XT up to Low SO40 4XU up to Low SO40 4YR up to Low SO40 7AZ up to Low SO40 7BA up to Low SO40 7GR up to Low SO40 7GS up to Low SO40 7GT up to Low SO40 8GR up to Low SO40 8SX up to Low SO40 8WZ up to Low SO40 8XY up to Low SO40 9AS up to Low SO40 9BT up to Low SO40 9DT up to Low SO40 9DY up to Low SO40 9EA up to Low SO40 9EB up to Low SO40 9GL up to Low SO40 9GP up to Low SO40 9GS up to Low SO40 9GX up to Low SO40 3AD up to Very low SO40 3JZ up to Very low SO40 4AA up to Very low SO40 4AB up to Very low SO40 8DQ up to Very low SO40 9BJ up to Very low SO40 9BP up to Very low SO40 9DS up to Very low SO40 9DW up to Very low SO40 9DX up to Very low SO40 9GU up to Very low

Rivers and flooding history near SO40

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

438 official flood warnings and alerts have been raised within ~10 km of the district's centre since 2006 (121 at warning level or above), most recently 19 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 SO40? 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

SO41 SO42 SO43 SO45 SO32 SO31 SO30 SO50

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.