Winchester Flood Risk
In Winchester, 695 of 80,111 properties (0.9%) are in areas at high or medium risk of flooding from rivers and the sea — at least a 1 in 100 chance in any year — per Environment Agency data updated 6 July 2026; that ranks 207th of 296 local authorities in England by number.
By bandProperties in Winchester by flood-risk band
| Risk band | Chance of flooding each year | All properties | Homes |
|---|---|---|---|
| High | 3.3% (1 in 30) or greater chance in any year | 509 | 343 |
| Medium | between 1% and 3.3% (1 in 100 to 1 in 30) chance in any year | 186 | 129 |
| Low | between 0.1% and 1% (1 in 1,000 to 1 in 100) chance in any year | 662 | 488 |
| Very low | less than 0.1% (1 in 1,000) chance in any year | 178 | 145 |
472 of the high- or medium-risk properties are homes and 121 are non-residential. 166 postcodes in Winchester have at least one property at high or medium risk.
Postcode districtsFlood risk across Winchester
Counts are for the part of each district inside Winchester.
Recorded floodsPast floods mapped in Winchester
The Environment Agency has mapped flood outlines on 20 dates in postcode districts that mostly lie in Winchester since 1995; the most recent started on 5 Mar 2014.
1990s 2 2000s 6 2010s 12
| Started | Place / name in the record | Source of flooding | Cause | Districts |
|---|---|---|---|---|
| 5 Mar 2014 | East Hampshire Photography 2 outlines | Other | Groundwater/high water table | SO23 |
| 24 Feb 2014 | Meonstoke Electricity Sub Station | Other | Groundwater/high water table | SO32 |
| 23 Feb 2014 | The Globe, New Arlesford | Main river | Channel capacity exceeded (no raised defences) | SO24 |
| 22 Feb 2014 | Soberton Village Hall 2 outlines | Main river | Groundwater/high water table | SO22 SO32 |
| 21 Feb 2014 | Bishops Sutton 2 outlines | Ordinary watercourse | Groundwater/high water table | SO24 SO32 |
| 18 Feb 2014 | King Charles Pub, Kingsworthy 3 outlines | Other | Groundwater/high water table | SO21 |
| 15 Feb 2014 | Village Hall, Sutton Scotney | Main river | Groundwater/high water table | SO21 |
| 12 Feb 2014 | Park Avenue, Winchester 7 outlines | Main river | Groundwater/high water table | SO23 SO24 |
| 11 Feb 2014 | Hazeley Road, Twyford | Main river | Groundwater/high water table | SO22 |
| 9 Feb 2014 | Winchester Leisure Centre 2 outlines | Main river | Groundwater/high water table | SO21 SO23 |
| 8 Feb 2014 | Bucks Head Hill, Meonstoke 2 outlines | Main river, other | Groundwater/high water table | SO32 |
| 31 Jan 2014 | Bridge Street, Wickham | Main river | Groundwater/high water table | PO17 |
| 1 Dec 2002 – 1 Mar 2003 | Lower Itchen 40 outlines | Ephemeral watercourse | Groundwater/high water table | SO22 SO23 SO32 |
| 1 Jan 2001 | River Dever Micheldever | Ephemeral watercourse | Groundwater/high water table | SO21 |
| 1 Dec 2000 – 1 Jun 2001 | River Itchen Bramdean 58 outlines | Ephemeral watercourse, main river | Groundwater/high water table | SO21 SO22 SO23 SO24 SO32 |
| 6 Nov 2000 – 7 Nov 2000 | River Meon 142 outlines | Main river, drainage | Channel capacity exceeded (no raised defences) | PO17 SO24 SO32 |
| 1 Nov 2000 – 1 Jan 2001 | Nunswalk St Headbourne Worthy 6 outlines | Ephemeral watercourse, main river | Groundwater/high water table | PO17 SO21 SO32 |
| 1 Jan 2000 | River Dever Wonston | Ephemeral watercourse | Groundwater/high water table | SO21 |
| 12 Feb 1995 – 27 Mar 1995 | Nuns Walk Stream Harestock | Ephemeral watercourse | Groundwater/high water table | SO21 |
| 1 Jan 1995 – 1 Apr 1995 | Sombourne Stream 40 outlines | Ephemeral watercourse | Groundwater/high water table | SO21 SO22 |
What this page shows, and what it misses
The Environment Agency's count of properties in each postcode that sit in areas of land at very low, low, medium or high risk of flooding from rivers and the sea, allowing for flood defences and their condition, added up here by postcode district and local authority. Every property in England is counted once, so the share is of all properties in the area.
It misses: surface water (heavy rain), groundwater, sewer and reservoir flooding; Wales, Scotland and Northern Ireland; and anything about a single building. A band describes the land a property stands on, not its floor level or flood protection, so it is not a forecast for any one home. Past floods come from the EA's Recorded Flood Outlines and are placed in the postcode district whose centre is nearest (within 12 km), so a flood near a boundary can be listed under a neighbour. Older records are patchy, and a flood with no outline is not listed.
"Winchester" means the local authority area (ONS code E07000094), not only the town centre.
If you live in Winchester
- Check your own address on gov.uk; it also covers surface water.
- Sign up for free flood warnings: gov.uk/get-flood-warnings. Floodline: 0345 988 1188.
- What is in force now: flood warnings UK · river levels.
- Never walk or drive through flood water: why shallow water kills.
FAQQuestions people ask
Is Winchester at risk of flooding?
In Winchester, 695 of 80,111 properties (0.9%) are in areas at high or medium risk of flooding from rivers and the sea — at least a 1 in 100 chance in any year — per Environment Agency data updated 6 July 2026; that ranks 207th of 296 local authorities in England by number.
Which parts of Winchester have the most properties at flood risk?
Postcode district PO7 has the most: 268 properties at high or medium risk (4.3% of its properties in Winchester). The table on this page lists every district.
When did Winchester last flood?
The Environment Agency has mapped flood outlines on 20 dates in postcode districts that mostly lie in Winchester since 1995; the most recent started on 5 Mar 2014.
Does this include surface water flooding?
No. These counts cover flooding from rivers and the sea only. Surface water (heavy rain) flooding affects more properties in England; check it for one address on gov.uk's long-term flood risk service.
Flood risk counts: Environment Agency, Risk of Flooding from Rivers and Sea – Postcodes in Areas at Risk and Recorded Flood Outlines, used under the Open Government Licence v3.0. © Environment Agency copyright and/or database right 2025. All rights reserved. Some features of this information 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.
Local authority of each postcode: Office for National Statistics postcode lookup (May 2026), licensed under the Open Government Licence v3.0. Contains OS data © Crown copyright and database right 2026. Contains Royal Mail data © Royal Mail copyright and database right 2026. District centres and place names: postcodes.io (ONS/OS open data). Totals, ranks and grouping are Global Incident Tracker's own calculations; the Environment Agency does not endorse them.