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Does SO51 flood?

Yes — parts of the SO51 district carry real flood risk: 67 of its 130 at-risk postcodes reach the Environment Agency's High likelihood band. The SO51 postcode district covers Blackwater, Mid Test, close to Romsey, Longbridge, Ower, and surrounding villages in parts of Hampshire and England.

130 postcodes in the SO51 district appear in the Environment Agency's rivers-and-sea flood-risk dataset — worst bands: 67 high, 20 medium, 37 low, 6 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 SO51 postcodes are at risk?

SO51 0DR up to High SO51 0EZ up to High SO51 0HA up to High SO51 0HB up to High SO51 0HE up to High SO51 0HR up to High SO51 0JF up to High SO51 0JG up to High SO51 0JJ up to High SO51 0JR up to High SO51 0JY up to High SO51 0LB up to High SO51 0LE up to High SO51 0LN up to High SO51 0LW up to High SO51 0NB up to High SO51 0PF up to High SO51 5AG up to High SO51 5AH up to High SO51 5AP up to High SO51 5AR up to High SO51 5AS up to High SO51 5AT up to High SO51 5AZ up to High SO51 5BN up to High SO51 5BP up to High SO51 5BQ up to High SO51 5EG up to High SO51 6AB up to High SO51 6AE up to High SO51 6AL up to High SO51 6AN up to High SO51 6BG up to High SO51 6EE up to High SO51 6EP up to High SO51 6FQ up to High SO51 7LE up to High SO51 8AA up to High SO51 8AB up to High SO51 8AJ up to High SO51 8BX up to High SO51 8BY up to High SO51 8BZ up to High SO51 8EQ up to High SO51 8ER up to High SO51 8ES up to High SO51 8GE up to High SO51 8GF up to High SO51 8GG up to High SO51 8GQ up to High SO51 8HF up to High SO51 8JA up to High SO51 8JB up to High SO51 8JD up to High SO51 8JE up to High SO51 8JF up to High SO51 8JL up to High SO51 8LZ up to High SO51 8PD up to High SO51 8PE up to High SO51 8WJ up to High SO51 9AN up to High SO51 9BD up to High SO51 9BN up to High SO51 9LA up to High SO51 9LB up to High SO51 9ZH up to High SO51 0AJ up to Medium SO51 0JA up to Medium SO51 5AL up to Medium SO51 5AN up to Medium SO51 6AF up to Medium SO51 6AP up to Medium SO51 6DJ up to Medium SO51 6EF up to Medium SO51 8AD up to Medium SO51 8AF up to Medium SO51 8GH up to Medium SO51 8HE up to Medium SO51 8HG up to Medium SO51 8HH up to Medium SO51 8HL up to Medium SO51 8HP up to Medium SO51 8LG up to Medium SO51 8LJ up to Medium SO51 8QL up to Medium SO51 9LH up to Medium SO51 0GX up to Low SO51 0HP up to Low SO51 0JH up to Low SO51 0NE up to Low SO51 0QB up to Low SO51 5AJ up to Low SO51 5AU up to Low SO51 5BA up to Low SO51 5BD up to Low SO51 5TA up to Low SO51 5UZ up to Low SO51 6BA up to Low SO51 6DH up to Low SO51 6DR up to Low SO51 6DW up to Low SO51 6FS up to Low SO51 6GL up to Low SO51 7AD up to Low SO51 7JG up to Low SO51 7LX up to Low SO51 7QN up to Low SO51 7QT up to Low SO51 7QU up to Low SO51 8AE up to Low SO51 8DY up to Low SO51 8FH up to Low SO51 8GD up to Low SO51 8GP up to Low SO51 8GX up to Low SO51 8HB up to Low SO51 8HD up to Low SO51 8HJ up to Low SO51 8HN up to Low SO51 8HQ up to Low SO51 8HR up to Low SO51 8HT up to Low SO51 9AJ up to Low SO51 0AE up to Very low SO51 0LD up to Very low SO51 7LP up to Very low SO51 7RY up to Very low SO51 7SA up to Very low SO51 8GU up to Very low

Rivers and flooding history near SO51

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

487 official flood warnings and alerts have been raised within ~10 km of the district's centre since 2006 (106 at warning level or above), most recently 30 March 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 SO51? 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

SO50 SO52 SO53 SO45 SO43 SO42 SO41 SO40

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.