SN16 Flood Risk
In postcode district SN16 (Wiltshire), 81 of 9,919 properties (0.8%) 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 is the 1,138th highest count of 2,181 districts in England.
By bandProperties in SN16 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 | 49 | 23 |
| Medium | between 1% and 3.3% (1 in 100 to 1 in 30) chance in any year | 32 | 19 |
| Low | between 0.1% and 1% (1 in 1,000 to 1 in 100) chance in any year | 132 | 85 |
| Very low | less than 0.1% (1 in 1,000) chance in any year | 8 | 4 |
42 of the high- or medium-risk properties are homes and 16 are non-residential (shops, offices, farms, public buildings); the rest are unclassified. By share, SN16 ranks 1,066th of 2,084 districts with at least 500 properties.
Postcode sectorsWhere in SN16 the risk sits
| Sector | Properties | High | Medium | Low | Very low | High + medium share |
|---|---|---|---|---|---|---|
| SN16 0 | 4,233 | 13 | 9 | 63 | 0 | 0.5% |
| SN16 9 | 5,686 | 36 | 23 | 69 | 8 | 1.0% |
Recorded floodsPast floods mapped near SN16
The Environment Agency has mapped flood outlines on 55 dates near SN16 since 1925; the most recent started on 24 Dec 2013.
| Started | Place / name in the record | Source of flooding | Cause |
|---|---|---|---|
| 24 Dec 2013 | Dauntsey to | Main river | Channel capacity exceeded (no raised defences) |
| 23 Dec 2013 | Norton, Malmesbury to | Main river | Channel capacity exceeded (no raised defences) |
| 21 Nov 2012 – 25 Nov 2012 | This represents flooding in the area in 5 outlines | Main river | Channel capacity exceeded (no raised defences) |
| 10 Feb 2009 | North Wessex 2 outlines | Main river | Channel capacity exceeded (no raised defences) |
| 16 Mar 2008 | Bourne Dauntsey OldSodomLane | Main river | Channel capacity exceeded (no raised defences) |
| 12 Jan 2008 – 20 Jan 2008 | Crudwell Fluvial Water | Ordinary watercourse | Channel capacity exceeded (no raised defences) |
| 1 Jan 2008 | This represents flooding in this area in | Main river | Not recorded |
| 21 Jul 2007 – 22 Jul 2007 | DauntseyBrook Dauntsey | Main river | Channel capacity exceeded (no raised defences) |
| 20 Jul 2007 – 21 Jul 2007 | Malmesbury Surrounding Area 2 outlines | Main river | Channel capacity exceeded (no raised defences) |
| 19 Jul 2007 – 29 Jul 2007 | Crudwell Fluvial Water 11 outlines | Ordinary watercourse, drainage | Channel capacity exceeded (no raised defences) |
| 1 Jul 2007 – 2 Jul 2007 | This represents flooding in this area in | Main river | Not recorded |
| 25 Nov 2006 – 26 Nov 2006 | This represents flooding in this area in 2 outlines | Main river | Other |
| 1 Jan 2003 | This represents flooding in this area in 2 outlines | Main river | Other |
| 1 Jan 2001 | This represents flooding in this area in | Main river | Not recorded |
| 30 Oct 2000 | This represents flooding in this area in | Main river | Channel capacity exceeded (no raised defences) |
| 28 Oct 2000 – 30 Oct 2000 | Avon Malmesbury | Main river | Overtopping of defences |
| 1 Oct 2000 | This represents flooding in this area in | Drainage | Local drainage/surface water |
| 1 Oct 1999 | This represents flooding in this area in | Main river | Other |
| 20 Jan 1999 | This represents flooding in this area in | Main river | Other |
| 19 Jan 1999 – 22 Jan 1999 | Sherston Avon Dauntsey Park 3 outlines | Main river | Channel capacity exceeded (no raised defences) |
| 28 Oct 1996 | This represents flooding in this area in | Ordinary watercourse | Channel capacity exceeded (no raised defences) |
| 25 Mar 1996 | This represents flooding in this area in 2 outlines | Main river | Channel capacity exceeded (no raised defences) |
| 18 Mar 1996 | This represents flooding in this area in 24 outlines | Drainage, ordinary watercourse | Local drainage/surface water |
| 14 Mar 1996 | This represents flooding in the area in | Drainage | Other |
| 1 Jan 1996 | This represents flooding in the area in | Ordinary watercourse | Local drainage/surface water |
| 31 Jan 1995 | This represents flooding in this area in | Main river | Local drainage/surface water |
| 13 Oct 1993 | This represents flooding in this area in | Main river | Channel capacity exceeded (no raised defences) |
| 3 Dec 1992 | This represents flooding in this area in | Main river | Channel capacity exceeded (no raised defences) |
| 1 Dec 1992 – 2 Dec 1992 | Sherston&TetburyAvon Malmesbury 2 outlines | Main river, ordinary watercourse | Channel capacity exceeded (no raised defences) |
| 30 Nov 1992 – 3 Dec 1992 | This represents flooding in this area in | Main river | Channel capacity exceeded (no raised defences) |
Showing the 30 most recent of 55 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.
Local authorities in SN16
- Wiltshire — 9,919 properties, 81 at high or medium risk
Parishes in SN16: Braydon, Brokenborough, Charlton, Crudwell, Easton Grey, Hankerton, Hullavington, Lea and Cleverton, Luckington, Malmesbury, Minety, Norton, Oaksey, Purton, Royal Wootton Bassett, Sherston, Shipton Moyne, St. Paul Malmesbury Without.
If you live in SN16
- Check your own address on gov.uk; it also covers surface water.
- Sign up for free flood warnings by phone, text or email: gov.uk/get-flood-warnings.
- See what is in force now on flood warnings UK, and river levels. Floodline: 0345 988 1188.
- Never walk or drive through flood water: why shallow water kills.
Nearby districts
FAQQuestions people ask
Is SN16 at risk of flooding?
In postcode district SN16 (Wiltshire), 81 of 9,919 properties (0.8%) 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 is the 1,138th highest count of 2,181 districts in England.
How many homes in SN16 are at high risk of flooding?
23 homes (residential properties) in SN16 are in areas at high risk (3.3% or greater chance each year) and 19 at medium risk, out of 6,921 homes, per Environment Agency data updated 6 July 2026. This counts rivers and the sea only, not surface water.
Has SN16 flooded before?
The Environment Agency has mapped flood outlines on 55 dates near SN16 since 1925; the most recent started on 24 Dec 2013.
How do I check the flood risk for my own address in SN16?
Use the government's long-term flood risk checker (check-long-term-flood-risk.service.gov.uk): it shows rivers and the sea, surface water, reservoirs and groundwater for one address. District figures here are totals and cannot tell you about a single home.
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.