St. Helens Flood Risk
In St. Helens, 338 of 96,403 properties (0.4%) 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 253rd of 296 local authorities in England by number.
By bandProperties in St. Helens 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 | 246 | 171 |
| Medium | between 1% and 3.3% (1 in 100 to 1 in 30) chance in any year | 92 | 82 |
| Low | between 0.1% and 1% (1 in 1,000 to 1 in 100) chance in any year | 933 | 842 |
| Very low | less than 0.1% (1 in 1,000) chance in any year | 29 | 28 |
253 of the high- or medium-risk properties are homes and 63 are non-residential. 55 postcodes in St. Helens have at least one property at high or medium risk.
Postcode districtsFlood risk across St. Helens
Counts are for the part of each district inside St. Helens.
Recorded floodsPast floods mapped in St. Helens
The Environment Agency has mapped flood outlines on 12 dates in postcode districts that mostly lie in St. Helens since 1997; the most recent started on 26 Dec 2015.
1990s 1 2000s 9 2010s 2
| Started | Place / name in the record | Source of flooding | Cause | Districts |
|---|---|---|---|---|
| 26 Dec 2015 | PeasleyCross,St.Helens 3 outlines | Other, main river | Local drainage/surface water | WA11 WA9 |
| 24 Sep 2012 | BlackBrook StHelens | Main river | Channel capacity exceeded (no raised defences) | WA11 |
| 21 Jan 2008 – 22 Jan 2008 | Sankey Brook Broad Oak, Me 2 outlines | Main river | Not recorded | WA11 WA9 |
| 8 Dec 2007 – 9 Dec 2007 | WindleBrook | Main river | Not recorded | WA10 |
| 20 Aug 2004 – 21 Aug 2004 | Mill Brook | Main river | Not recorded | WA10 |
| 10 Aug 2004 – 11 Aug 2004 | Sutton Mill WheatsheafHotel 2 outlines | Drainage | Local drainage/surface water | WA9 |
| 3 Aug 2004 – 4 Aug 2004 | StHelens 2 outlines | Main river | Not recorded | WA9 |
| 9 Sep 2002 – 10 Sep 2002 | — | Not recorded | Channel capacity exceeded (no raised defences) | WA9 |
| 14 Jun 2002 – 15 Jun 2002 | Clipsley Brook 2 outlines | Main river, ordinary watercourse | Overtopping of defences | WA11 |
| 28 Oct 2000 – 29 Oct 2000 | — 7 outlines | Ordinary watercourse | Channel capacity exceeded (no raised defences) | WA11 |
| 3 Jun 2000 – 4 Jun 2000 | — | Not recorded | Obstruction/blockage - channel | WA10 |
| 24 Dec 1997 – 25 Dec 1997 | — 11 outlines | Not recorded | Obstruction/blockage - channel | WA10 WA11 WA9 |
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.
"St. Helens" means the local authority area (ONS code E08000013), not only the town centre.
If you live in St. Helens
- 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 St. Helens at risk of flooding?
In St. Helens, 338 of 96,403 properties (0.4%) 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 253rd of 296 local authorities in England by number.
Which parts of St. Helens have the most properties at flood risk?
Postcode district WA10 has the most: 146 properties at high or medium risk (0.6% of its properties in St. Helens). The table on this page lists every district.
When did St. Helens last flood?
The Environment Agency has mapped flood outlines on 12 dates in postcode districts that mostly lie in St. Helens since 1997; the most recent started on 26 Dec 2015.
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.