Flood Warning Areas in Mayfair & Soho (W1)
Environment Agency flood warning areas and alert areas within about 2km of W1, and any warnings in force now. This is not a flood risk rating for a home.
Which flood warning areas cover Mayfair & Soho (W1)?
The Environment Agency lists 8 flood warning and alert areas within 2km of the W1 centre, against 9 around WC1, 10 around SW1Y, 11 around WC2, 12 around SW1A on the same measure.
What does the flood checker show for W1?
For W1 it lists 8 Environment Agency flood warning and alert areas within 2km of the outcode centre, including "Tidal Thames at Westminster" and "Tidal Thames from Hungerford Bridge to Battersea Power Station", and any warnings in force there. It is not the Environment Agency's rating of a property's flood risk — for that, check the exact address on GOV.UK's long-term flood risk service.
How do I check the long-term flood risk of a W1 address?
Enter the exact address into GOV.UK's "check your long term flood risk" service. It gives the Environment Agency's river, sea and surface-water ratings for that property, which a list of warning areas across W1 cannot. Check it before you offer, and ask the seller whether the home has ever flooded or had a flood claim.
W1 at a glance
The Environment Agency lists 8 flood warning and alert areas within 2km of the W1 centre. No flood warning or alert was in force within 2km when this page was generated on 26 October 2026.
- Flood warning areas within 2km
- 4
- Flood alert areas within 2km
- 4
- Warnings or alerts in force, 26 October 2026
- 0
| Flood area | Covers | Type |
|---|---|---|
| Tidal Thames at Westminster | River Thames at Westminster including St James's Park, Victoria and Westminster Cathedral | Warning area |
| Tidal Thames from Hungerford Bridge to Battersea Power Station | River Thames from Hungerford Bridge to Battersea Power Station including Waterloo, Albert Embankment, Vauxhall, Oval and Nine Elms | Warning area |
| Tidal Thames from Blackfriars Bridge to Vauxhall Bridge | River Thames from Blackfriars Bridge to Vauxhall Bridge including Temple, Embankment and Houses of Parliament | Warning area |
| Tidal Thames from London Bridge to Hungerford Bridge | River Thames from London Bridge to Hungerford Bridge including Borough, the South Bank, Elephant and Castle and Waterloo | Warning area |
| Tidal Thames in the boroughs of Greenwich, Lewisham, Southwark, Lambeth and Wandsworth | River Thames including areas in the boroughs of Greenwich, Lewisham, Southwark, Lambeth and Wandsworth | Alert area |
| Tidal Thames in the boroughs of Tower Hamlets, City of London, City of Westminster, Ken and Chelsea | River Thames including areas in the boroughs of Tower Hamlets, the City of London, the City of Westminster and Kensington & Chelsea | Alert area |
| Tidal Thames riverside from the Thames Barrier to Putney Bridge | River Thames riverside from the Thames Barrier to Putney Bridge | Alert area |
| Groundwater flooding in South East London | Areas at risk from Groundwater flooding including Caterham Bourne, Coulsdon Bourne, Beddington, Carshalton, Coulsdon, Kenley, Purley, South Croydon, Whyteleafe, Bromley, Bexley, Lewisham, Greenwich, Epsom and Ewell. | Alert area |
A flood warning area is where the Environment Agency issues warnings when flooding of homes is expected; an alert area is the wider zone where flooding is possible. Being inside one is not a rating of any property's flood risk.
These areas cover flooding from rivers and the sea. Surface water flooding is not included, so an outcode with no listed areas can still flood. For a property's own long-term rating, use GOV.UK's "check your long term flood risk" service.
Source: Environment Agency real-time flood-monitoring API (Open Government Licence): flood areas and warnings within 2km of the W1 centroid, checked 26 October 2026.
How W1 compares with its nearest outcodes
| Outcode | Flood warning areas within 2km | Flood alert areas within 2km | Distance between centres |
|---|---|---|---|
| Mayfair & Soho (W1) | 4 | 4 | — |
| Bloomsbury & Holborn (WC1) | 6 | 3 | 0.9km |
| SW1Y | 6 | 4 | 1.1km |
| Covent Garden & Strand (WC2) | 7 | 4 | 1.1km |
| Westminster (SW1A) | 8 | 4 | 1.4km |
Neighbours are the outcodes nearest W1, by straight-line distance between outcode centres (postcodes.io), for which the Environment Agency answered.
These are counts of the areas where the Environment Agency issues warnings, not a rating of flood risk: an outcode on a river lists more areas whether or not any home in it has flooded, and surface water is not covered.
Source: Environment Agency real-time flood-monitoring API (Open Government Licence): flood warning and alert areas within 2km of each outcode centroid.
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A screening indication from public data, not a survey or a site investigation. It does not replace a specialist report, and the absence of a flag is not evidence of the absence of risk.
Contains public sector information licensed under the Open Government Licence v3.0.
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