South Gloucestershire Flood Risk
In South Gloucestershire, 885 of 153,161 properties (0.6%) 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 187th of 296 local authorities in England by number.
By bandProperties in South Gloucestershire 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 | 448 | 221 |
| Medium | between 1% and 3.3% (1 in 100 to 1 in 30) chance in any year | 437 | 311 |
| Low | between 0.1% and 1% (1 in 1,000 to 1 in 100) chance in any year | 1,732 | 1,191 |
| Very low | less than 0.1% (1 in 1,000) chance in any year | 3,096 | 2,001 |
532 of the high- or medium-risk properties are homes and 213 are non-residential. 175 postcodes in South Gloucestershire have at least one property at high or medium risk.
Postcode districtsFlood risk across South Gloucestershire
Counts are for the part of each district inside South Gloucestershire.
| District | Properties | High + medium | High | Share |
|---|---|---|---|---|
| BS37 | 22,920 | 278 | 91 | 1.2% |
| BS15 | 19,863 | 139 | 118 | 0.7% |
| BS35 | 14,468 | 114 | 57 | 0.8% |
| BS30 | 15,185 | 95 | 55 | 0.6% |
| GL12 | 4,749 | 76 | 49 | 1.6% |
| BS16 | 29,958 | 72 | 27 | 0.2% |
| BS34 | 18,592 | 65 | 24 | 0.3% |
| BS31 | 35 | 16 | 9 | 45.7% |
| BS36 | 8,410 | 12 | 10 | 0.1% |
| BS32 | 12,037 | 10 | 4 | 0.1% |
| GL9 | 1,809 | 5 | 3 | 0.3% |
| BS10 | 1,632 | 2 | 0 | 0.1% |
| SN14 | 1,573 | 1 | 1 | 0.1% |
| BS7 | 1,586 | 0 | 0 | 0.0% |
| GL13 | 250 | 0 | 0 | 0.0% |
| BA1 | 94 | 0 | 0 | 0.0% |
Recorded floodsPast floods mapped in South Gloucestershire
The Environment Agency has mapped flood outlines on 43 dates in postcode districts that mostly lie in South Gloucestershire since 1925; the most recent started on 23 Oct 2022.
1920s 1 1960s 11 1970s 12 1980s 2 1990s 5 2000s 3 2010s 8 2020s 1
| Started | Place / name in the record | Source of flooding | Cause | Districts |
|---|---|---|---|---|
| 23 Oct 2022 | This represents flooding in the area in | Main river | Obstruction/blockage - channel | BS15 |
| 5 Jan 2014 | Hanham to | Drainage | Local drainage/surface water | BS15 |
| 24 Dec 2013 | Swineford to | Main river | Channel capacity exceeded (no raised defences) | BS30 |
| 23 Dec 2013 | Oldbury-on-Severn to | Ordinary watercourse | Channel capacity exceeded (no raised defences) | BS35 |
| 25 Nov 2012 | Oldbury on Severn 2 outlines | Ordinary watercourse | Channel capacity exceeded (no raised defences) | BS35 |
| 23 Nov 2012 | Stoke Gifford | Ordinary watercourse | Channel capacity exceeded (no raised defences) | BS34 |
| 22 Nov 2012 | Old Sodbury | Main river | Other | GL9 |
| 21 Nov 2012 | Old Sodbury 7 outlines | Main river, ordinary watercourse | Channel capacity exceeded (no raised defences) | BS16 BS32 BS35 BS36 BS37 GL9 |
| 4 Nov 2012 | Old Sodbury | Main river | Other | BS37 |
| 10 Feb 2009 | North Wessex | Main river | Channel capacity exceeded (no raised defences) | BS30 |
| 30 Oct 2000 – 31 Oct 2000 | Owls Nest Stream Itchington 3 outlines | Main river | Channel capacity exceeded (no raised defences) | BS35 BS36 GL9 |
| 29 Oct 2000 – 12 Nov 2000 | Olveston 32 outlines | Main river | Channel capacity exceeded (no raised defences) | BS32 BS35 |
| 19 Jan 1999 – 22 Jan 1999 | Avon Hencliffe Bristol | Main river | Channel capacity exceeded (no raised defences) | BS15 |
| 21 Mar 1996 | This represents flooding in this area in 4 outlines | Drainage | Local drainage/surface water | GL9 |
| 23 Feb 1996 | This represents flooding in the area in | Ordinary watercourse | Other | GL9 |
| 26 Feb 1990 – 2 Mar 1990 | Redwick | Sea | Not recorded | BS32 |
| 1 Feb 1990 | This represents flooding in this area in | Ordinary watercourse | Not recorded | GL9 |
| 16 Mar 1982 | Avon Hanham | Main river | Channel capacity exceeded (no raised defences) | BS15 |
| 1 Feb 1980 | Aust | Ordinary watercourse | Not recorded | BS35 |
| 30 May 1979 – 31 May 1979 | Bradley Brook Hambrook | Main river | Channel capacity exceeded (no raised defences) | BS34 |
| 6 Mar 1978 | This represents flooding in this area in 4 outlines | Ordinary watercourse, drainage | Channel capacity exceeded (no raised defences) | GL9 |
| 27 Sep 1976 | Hinton | Drainage | Local drainage/surface water | BS37 |
| 26 Sep 1976 – 27 Sep 1976 | Bradley Brook Stoke Gifford | Main river | Channel capacity exceeded (no raised defences) | BS34 |
| 1 Jan 1976 | Redwick 2 outlines | Main river | Channel capacity exceeded (no raised defences) | BS32 |
| 28 Jan 1975 | Warmley brook Crane Close Warmley | Main river | Channel capacity exceeded (no raised defences) | BS15 |
| 27 Sep 1974 | Bristol Kingswood Avon 2 outlines | Main river | Channel capacity exceeded (no raised defences) | BS30 GL9 |
| 3 Sep 1974 – 4 Sep 1974 | Owls Nest Str Itchington | Main river | Channel capacity exceeded (no raised defences) | BS35 |
| 11 Feb 1974 | Siston Willsbridge Oldland Warmley | Main river | Channel capacity exceeded (no raised defences) | BS30 |
| 9 Feb 1974 – 10 Feb 1974 | WarmleyBk Warmley | Main river | Channel capacity exceeded (no raised defences) | BS30 |
| 13 Dec 1972 | SistonBrook Kingswood Bristol | Main river | Channel capacity exceeded (no raised defences) | BS30 |
| 10 Jun 1971 – 11 Jun 1971 | Bristol Avon Warmley Oldland | Main river | Channel capacity exceeded (no raised defences) | BS30 |
| 10 Jul 1968 – 11 Jul 1968 | Boyd Dyrham Hinton 6 outlines | Main river, drainage | Channel capacity exceeded (no raised defences) | BS16 BS30 BS34 BS37 GL9 |
| 1 Jul 1968 | Oldbury Upon Severn 12 outlines | Main river | Channel capacity exceeded (no raised defences) | BS35 |
| 5 Nov 1966 | SistonBrook Kingswood Willsbridge Bristol | Main river | Channel capacity exceeded (no raised defences) | BS30 |
| 18 Dec 1965 – 20 Dec 1965 | Dyrham Hinton 5 outlines | Main river, drainage | Channel capacity exceeded (no raised defences) | BS16 BS30 BS36 BS37 GL9 |
| 15 Dec 1965 – 18 Dec 1965 | Boyd Dyrham Hinton | Main river | Local drainage/surface water | BS30 |
| 1 Jan 1965 | This represents flooding in the area in | Drainage | Other | GL9 |
| 20 Nov 1963 | Bristol Frome Chipping Sodbury | Main river | Channel capacity exceeded (no raised defences) | BS37 |
| 18 Nov 1963 – 20 Nov 1963 | Bristol Frome Chipping Sodbury | Main river | Channel capacity exceeded (no raised defences) | BS37 |
| 1 Jan 1962 – 31 Jan 1962 | Siston Brook Kingswood | Main river | Channel capacity exceeded (no raised defences) | BS30 |
Showing the 40 most recent of 43 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.
"South Gloucestershire" means the local authority area (ONS code E06000025), not only the town centre.
If you live in South Gloucestershire
- 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 South Gloucestershire at risk of flooding?
In South Gloucestershire, 885 of 153,161 properties (0.6%) 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 187th of 296 local authorities in England by number.
Which parts of South Gloucestershire have the most properties at flood risk?
Postcode district BS37 has the most: 278 properties at high or medium risk (1.2% of its properties in South Gloucestershire). The table on this page lists every district.
When did South Gloucestershire last flood?
The Environment Agency has mapped flood outlines on 43 dates in postcode districts that mostly lie in South Gloucestershire since 1925; the most recent started on 23 Oct 2022.
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.