Wiltshire Flood Risk
In Wiltshire, 4,555 of 299,864 properties (1.5%) 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 31st of 296 local authorities in England by number.
By bandProperties in Wiltshire 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 | 2,095 | 1,302 |
| Medium | between 1% and 3.3% (1 in 100 to 1 in 30) chance in any year | 2,460 | 1,647 |
| Low | between 0.1% and 1% (1 in 1,000 to 1 in 100) chance in any year | 6,445 | 4,511 |
| Very low | less than 0.1% (1 in 1,000) chance in any year | 185 | 141 |
2,949 of the high- or medium-risk properties are homes and 1,065 are non-residential. 839 postcodes in Wiltshire have at least one property at high or medium risk.
Postcode districtsFlood risk across Wiltshire
Counts are for the part of each district inside Wiltshire.
| District | Properties | High + medium | High | Share |
|---|---|---|---|---|
| SP2 | 17,525 | 1,039 | 376 | 5.9% |
| SP1 | 13,048 | 1,011 | 322 | 7.7% |
| BA12 | 20,131 | 287 | 131 | 1.4% |
| SN15 | 22,600 | 270 | 114 | 1.2% |
| SP3 | 8,647 | 240 | 156 | 2.8% |
| SN8 | 15,899 | 182 | 75 | 1.1% |
| SN9 | 5,397 | 177 | 146 | 3.3% |
| BA15 | 8,212 | 174 | 82 | 2.1% |
| SP5 | 12,503 | 163 | 106 | 1.3% |
| BA13 | 12,913 | 159 | 76 | 1.2% |
| SN12 | 15,987 | 132 | 62 | 0.8% |
| BA14 | 27,642 | 130 | 50 | 0.5% |
| SP4 | 20,769 | 97 | 39 | 0.5% |
| SN14 | 14,858 | 89 | 63 | 0.6% |
| SN16 | 9,919 | 81 | 49 | 0.8% |
| SN13 | 10,470 | 74 | 61 | 0.7% |
| SN11 | 13,904 | 62 | 40 | 0.4% |
| SN6 | 4,529 | 52 | 43 | 1.1% |
| SP9 | 4,216 | 39 | 31 | 0.9% |
| SN10 | 19,409 | 37 | 27 | 0.2% |
| SN5 | 4,460 | 22 | 18 | 0.5% |
| SP7 | 1,825 | 20 | 16 | 1.1% |
| BA2 | 682 | 7 | 5 | 1.0% |
| BA11 | 26 | 5 | 3 | 19.2% |
| SN4 | 9,707 | 4 | 3 | 0.0% |
| RG17 | 541 | 2 | 1 | 0.4% |
| SP11 | 4,037 | 0 | 0 | 0.0% |
| GL7 | 8 | 0 | 0 | 0.0% |
Recorded floodsPast floods mapped in Wiltshire
The Environment Agency has mapped flood outlines on 179 dates in postcode districts that mostly lie in Wiltshire since 1894; the most recent started on 21 Oct 2023.
1890s 1 1900s 1 1920s 2 1930s 8 1940s 2 1950s 7 1960s 10 1970s 19 1980s 21 1990s 57 2000s 25 2010s 25 2020s 1
| Started | Place / name in the record | Source of flooding | Cause | Districts |
|---|---|---|---|---|
| 21 Oct 2023 | This represents flooding on the at Dauntsey in | Main river | Channel capacity exceeded (no raised defences) | SN15 |
| 15 Dec 2015 | This represents flooding in the area in | Not recorded | Not recorded | SN10 |
| 27 Feb 2014 | This represents flooding in the area in | Not recorded | Not recorded | SN11 |
| 19 Feb 2014 | This represents flooding in the area in 6 outlines | Other | Groundwater/high water table | SN10 SN9 |
| 18 Feb 2014 | Pitton 3 outlines | Main river | Groundwater/high water table | SP1 |
| 14 Feb 2014 | This represents flooding in this area in | Not recorded | Not recorded | SP2 |
| 7 Feb 2014 | This represents flooding in the area in | Main river | Not recorded | SN10 |
| 6 Feb 2014 | Salisbury to | Main river | Channel capacity exceeded (no raised defences) | SP1 |
| 13 Jan 2014 | BIshopstone to | Main river | Channel capacity exceeded (no raised defences) | SP2 |
| 12 Jan 2014 | This represents flooding in the area in | Ordinary watercourse | Not recorded | BA13 |
| 11 Jan 2014 | Shrewton, Amesbury to | Main river | Channel capacity exceeded (no raised defences) | SP4 |
| 9 Jan 2014 – 27 Feb 2014 | Flood Extents to 3 outlines | Main river | Overtopping of defences | SN12 SP2 |
| 8 Jan 2014 | Wilton to 2 outlines | Main river | Channel capacity exceeded (no raised defences) | SP2 |
| 7 Jan 2014 | This represents flooding in the area in 10 outlines | Main river, drainage | Groundwater/high water table | BA15 SN10 SN15 SN9 SP2 |
| 6 Jan 2014 | Salisbury to 13 outlines | Main river | Channel capacity exceeded (no raised defences) | SP1 |
| 5 Jan 2014 | Bulford to | Ordinary watercourse | Channel capacity exceeded (no raised defences) | SP4 |
| 4 Jan 2014 – 6 Jan 2014 | This represents flooding in the area in 6 outlines | Drainage, main river | Overtopping of defences | BA13 SN10 SN12 SN15 SN9 |
| 2 Jan 2014 | Britford to 2 outlines | Ordinary watercourse | Channel capacity exceeded (no raised defences) | SN15 SP1 |
| 1 Jan 2014 | This represents flooding in the area in 6 outlines | Drainage | Not recorded | BA14 SN10 SN12 SN13 |
| 26 Dec 2013 | Bradford on Avon to | Main river | Channel capacity exceeded (no raised defences) | BA15 |
| 24 Dec 2013 – 4 Jan 2014 | This represents flooding in the area in 11 outlines | Main river, ordinary watercourse | Channel capacity exceeded (no raised defences) | BA14 BA15 SN10 SN12 SN15 SN16 SN9 |
| 23 Dec 2013 – 24 Dec 2013 | This represents flooding in the area in 7 outlines | Main river, drainage | Channel capacity exceeded (no raised defences) | BA13 BA14 BA15 SN10 SN12 SN14 SN16 |
| 24 Nov 2012 | This represents flooding in the area in 2 outlines | Not recorded | Not recorded | BA15 SN9 |
| 21 Nov 2012 – 25 Nov 2012 | This represents flooding in the area in 22 outlines | Main river, ordinary watercourse | Channel capacity exceeded (no raised defences) | BA15 SN11 SN12 SN14 SN15 SN16 |
| 4 Nov 2012 | Freshford | Drainage | Obstruction/blockage - culvert | BA15 |
| 29 Apr 2012 – 5 May 2012 | This represents flooding in the area in 2 outlines | Main river | Other | BA14 SN13 |
| 10 Feb 2009 | North Wessex 8 outlines | Main river | Channel capacity exceeded (no raised defences) | SN12 SN15 SN16 |
| 15 Dec 2008 | This represents flooding in the area in | Main river | Not recorded | SN10 |
| 13 Dec 2008 – 14 Dec 2008 | Biss Yarnbrook 2 outlines | Main river | Overtopping of defences | BA14 SN10 |
| 16 Mar 2008 – 17 Mar 2008 | SurfaceWater Dauntsey 3 outlines | Drainage, ordinary watercourse | Channel capacity exceeded (no raised defences) | SN15 SN16 |
| 15 Jan 2008 | This represents flooding in the area in | Main river | Other | BA15 |
| 12 Jan 2008 – 20 Jan 2008 | Crudwell Fluvial Water | Ordinary watercourse | Channel capacity exceeded (no raised defences) | SN16 |
| 1 Jan 2008 | This represents flooding in this area in | Main river | Not recorded | SN16 |
| 21 Jul 2007 – 22 Jul 2007 | DauntseyBrook Dauntsey | Main river | Channel capacity exceeded (no raised defences) | SN16 |
| 20 Jul 2007 – 21 Jul 2007 | Malmesbury Surrounding Area 2 outlines | Main river | Channel capacity exceeded (no raised defences) | SN16 |
| 19 Jul 2007 – 29 Jul 2007 | Crudwell Fluvial Water 12 outlines | Ordinary watercourse, main river | Channel capacity exceeded (no raised defences) | SN16 SN4 |
| 15 Jul 2007 | This represents flooding in this area in | Main river | Not recorded | SN15 |
| 1 Jul 2007 – 2 Jul 2007 | This represents flooding in this area in | Main river | Not recorded | SN16 |
| 25 Nov 2006 – 26 Nov 2006 | This represents flooding in this area in 2 outlines | Main river | Other | SN16 |
| 2 Jan 2003 | This represents flooding in the area in | Main river | Not recorded | BA15 |
Showing the 40 most recent of 179 dates.
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.
"Wiltshire" means the local authority area (ONS code E06000054), not only the town centre.
If you live in Wiltshire
- 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 Wiltshire at risk of flooding?
In Wiltshire, 4,555 of 299,864 properties (1.5%) 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 31st of 296 local authorities in England by number.
Which parts of Wiltshire have the most properties at flood risk?
Postcode district SP2 has the most: 1,039 properties at high or medium risk (5.9% of its properties in Wiltshire). The table on this page lists every district.
When did Wiltshire last flood?
The Environment Agency has mapped flood outlines on 179 dates in postcode districts that mostly lie in Wiltshire since 1894; the most recent started on 21 Oct 2023.
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.