Havant Flood Risk
In Havant, 2,417 of 63,343 properties (3.8%) 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 ranks 91st of 296 local authorities in England by number.
By bandProperties in Havant 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 | 1,491 | 1,109 |
| Medium | between 1% and 3.3% (1 in 100 to 1 in 30) chance in any year | 926 | 650 |
| Low | between 0.1% and 1% (1 in 1,000 to 1 in 100) chance in any year | 1,715 | 1,178 |
| Very low | less than 0.1% (1 in 1,000) chance in any year | 1,073 | 751 |
1,759 of the high- or medium-risk properties are homes and 578 are non-residential. 250 postcodes in Havant have at least one property at high or medium risk.
Postcode districtsFlood risk across Havant
Counts are for the part of each district inside Havant.
Recorded floodsPast floods mapped in Havant
The Environment Agency has mapped flood outlines on 24 dates in postcode districts that mostly lie in Havant since 1960; the most recent started on 22 Feb 2014.
1960s 1 1970s 4 1980s 3 1990s 3 2000s 10 2010s 3
| Started | Place / name in the record | Source of flooding | Cause | Districts |
|---|---|---|---|---|
| 22 Feb 2014 | Enmore Road, Denmead | Other | Groundwater/high water table | PO7 |
| 31 Dec 2013 | Lumley Road, Emsworth | Main river | Channel capacity exceeded (no raised defences) | PO10 |
| 9 Nov 2010 | West Brook Bridge Road | Main river | Other | PO10 |
| 10 Mar 2008 | Northney 4 outlines | Sea | Other | PO10 PO11 PO9 |
| 3 Nov 2005 | Hayling Island 10 outlines | Sea | Overtopping of defences | PO11 |
| 1 Dec 2002 – 1 Mar 2003 | Lavant Stream 30 outlines | Ephemeral watercourse | Groundwater/high water table | PO9 |
| 1 Dec 2000 | Lavant Stream Havant | Not recorded | Not recorded | PO9 |
| 15 Nov 2000 – 1 Jan 2001 | Lavant Stream Rowlands Castle | Ephemeral watercourse | Groundwater/high water table | PO9 |
| 1 Nov 2000 – 1 May 2001 | Lavant Stream Rowlands Castle 22 outlines | Ephemeral watercourse, drainage | Groundwater/high water table | PO10 PO9 |
| 30 Oct 2000 | Church Lane w/c Gable Head 2 outlines | Not recorded | Not recorded | PO11 |
| 9 Oct 2000 | River Wallington Waterlooville 2 outlines | Not recorded | Not recorded | PO7 |
| 1 Oct 2000 – 1 Jan 2001 | River Wallington Denmead | Ephemeral watercourse | Groundwater/high water table | PO7 |
| 1 Jan 2000 | General Lavant Stream Havant | Not recorded | Not recorded | PO9 |
| 30 Jan 1995 – 12 Mar 1995 | Lavant Stream Rowlands Castle | Ephemeral watercourse | Groundwater/high water table | PO9 |
| 16 Jun 1991 | CHIDHAM | Drainage | Other | PO10 |
| 7 Mar 1991 | Brockhampton Stream Brockhampton | Main river | Not recorded | PO9 |
| 14 Dec 1989 | West Brook Emsworth | Ordinary watercourse | Not recorded | PO10 |
| 8 Apr 1985 | Coast Northey Road, Hayling Island | Not recorded | Not recorded | PO10 |
| 14 Dec 1981 | Coast N Hayling, Hayling Island 3 outlines | Other | Not recorded | PO10 PO11 |
| 10 Feb 1977 | Bedhampton Brook Bedhampton | Ordinary watercourse | Not recorded | PO9 |
| 14 Oct 1976 | Coast Emsworth | Not recorded | Not recorded | PO10 |
| 23 Nov 1974 | CHIDHAM | Not recorded | Other | PO10 |
| 1 Nov 1974 | River Lavent Flood | Ordinary watercourse | Channel capacity exceeded (no raised defences) | PO10 |
| 1 Nov 1960 | CHICHESTER | Drainage | Other | PO10 |
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.
"Havant" means the local authority area (ONS code E07000090), not only the town centre.
If you live in Havant
- 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 Havant at risk of flooding?
In Havant, 2,417 of 63,343 properties (3.8%) 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 ranks 91st of 296 local authorities in England by number.
Which parts of Havant have the most properties at flood risk?
Postcode district PO11 has the most: 1,066 properties at high or medium risk (9.3% of its properties in Havant). The table on this page lists every district.
When did Havant last flood?
The Environment Agency has mapped flood outlines on 24 dates in postcode districts that mostly lie in Havant since 1960; the most recent started on 22 Feb 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.