CH3 Flood Risk
In postcode district CH3 (Cheshire West and Chester), 326 of 20,682 properties (1.6%) 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 is the 532nd highest count of 2,181 districts in England.
By bandProperties in CH3 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 | 316 | 224 |
| Medium | between 1% and 3.3% (1 in 100 to 1 in 30) chance in any year | 10 | 8 |
| Low | between 0.1% and 1% (1 in 1,000 to 1 in 100) chance in any year | 188 | 150 |
| Very low | less than 0.1% (1 in 1,000) chance in any year | 38 | 22 |
232 of the high- or medium-risk properties are homes and 50 are non-residential (shops, offices, farms, public buildings); the rest are unclassified. By share, CH3 ranks 759th of 2,084 districts with at least 500 properties.
Postcode sectorsWhere in CH3 the risk sits
| Sector | Properties | High | Medium | Low | Very low | High + medium share |
|---|---|---|---|---|---|---|
| CH3 3 | 1 | 0 | 0 | 0 | 0 | 0.0% |
| CH3 5 | 6,471 | 217 | 1 | 126 | 7 | 3.4% |
| CH3 6 | 4,334 | 60 | 0 | 6 | 7 | 1.4% |
| CH3 7 | 3,883 | 14 | 2 | 6 | 0 | 0.4% |
| CH3 8 | 2,559 | 14 | 5 | 8 | 0 | 0.7% |
| CH3 9 | 3,434 | 11 | 2 | 42 | 24 | 0.4% |
Recorded floodsPast floods mapped near CH3
The Environment Agency has mapped flood outlines on 7 dates near CH3 since 1971; the most recent started on 16 Oct 2024.
| Started | Place / name in the record | Source of flooding | Cause |
|---|---|---|---|
| 16 Oct 2024 | Castlefields | Main river | Channel capacity exceeded (no raised defences) |
| 20 Oct 2023 – 23 Oct 2023 | Tattenhall, Castlefields | Drainage | Local drainage/surface water |
| 20 Jan 2021 | Tattenhall | Main river | Channel capacity exceeded (no raised defences) |
| 6 Nov 2000 – 7 Nov 2000 | Tattenhall 2 outlines | Ordinary watercourse | Channel capacity exceeded (no raised defences) |
| 1 Nov 2000 – 15 Nov 2000 | Eaton | Main river | Channel capacity exceeded (no raised defences) |
| 23 May 1971 – 24 May 1971 | — | Not recorded | Channel capacity exceeded (no raised defences) |
| 23 Apr 1971 – 24 Apr 1971 | — 4 outlines | Main river | Channel capacity exceeded (no raised defences) |
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 CH3
- Cheshire West and Chester — 20,681 properties, 326 at high or medium risk
Parishes in CH3: Aldersey, Aldford and Saighton, Ashton Hayes and Horton-cum-Peel, Barrow, Broxton, Burwardsley, Carden, Chowley, Christleton, Churton, Clotton Hoofield, Clutton, Coddington, Farndon, Golborne David, Great Boughton, Guilden Sutton, Handley, Hargrave and Huxley, Harthill, Huntington, Littleton, Mouldsworth, Peckforton, Rowton, Shocklach Oviatt and District, Stretton, Tarvin, Tattenhall and District, Waverton.
If you live in CH3
- 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 CH3 at risk of flooding?
In postcode district CH3 (Cheshire West and Chester), 326 of 20,682 properties (1.6%) 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 is the 532nd highest count of 2,181 districts in England.
How many homes in CH3 are at high risk of flooding?
224 homes (residential properties) in CH3 are in areas at high risk (3.3% or greater chance each year) and 8 at medium risk, out of 16,705 homes, per Environment Agency data updated 6 July 2026. This counts rivers and the sea only, not surface water.
Has CH3 flooded before?
The Environment Agency has mapped flood outlines on 7 dates near CH3 since 1971; the most recent started on 16 Oct 2024.
How do I check the flood risk for my own address in CH3?
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.