Flood Warning Areas in Clapham (SW4)
Environment Agency flood warning areas and alert areas within about 2km of SW4, and any warnings in force now. This is not a flood risk rating for a home.
Which flood warning areas cover Clapham (SW4)?
The Environment Agency lists 7 flood warning and alert areas within 2km of the SW4 centre, against 5 around SW2, 13 around SW8, 11 around SW9, 9 around SW12 on the same measure.
What does the flood checker show for SW4?
For SW4 it lists 7 Environment Agency flood warning and alert areas within 2km of the outcode centre, including "Tidal Thames from Battersea Bridge to Wandsworth Bridge" and "Tidal Thames from Battersea Power Station to Battersea Bridge", 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 an SW4 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 SW4 cannot. Check it before you offer, and ask the seller whether the home has ever flooded or had a flood claim.
SW4 at a glance
The Environment Agency lists 7 flood warning and alert areas within 2km of the SW4 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
- 3
- Flood alert areas within 2km
- 4
- Warnings or alerts in force, 26 October 2026
- 0
| Flood area | Covers | Type |
|---|---|---|
| Tidal Thames from Battersea Bridge to Wandsworth Bridge | River Thames from Battersea Bridge to Wandsworth Bridge including west Battersea, Clapham Junction and east Wandsworth | Warning area |
| Tidal Thames from Battersea Power Station to Battersea Bridge | River Thames from Battersea Power Station to Battersea Bridge including Battersea | 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 |
| River Wandle area in the London Boroughs of Wandsworth, Merton, Lambeth, Croydon and Sutton | River Wandle area in the London Boroughs of Wandsworth, Merton, Lambeth, Croydon and Sutton. Including the Norbury Brook from Thornton Heath to Tooting | Alert 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 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 SW4 centroid, checked 26 October 2026.
How SW4 compares with its nearest outcodes
| Outcode | Flood warning areas within 2km | Flood alert areas within 2km | Distance between centres |
|---|---|---|---|
| Clapham (SW4) | 3 | 4 | — |
| Brixton & Streatham Hill (SW2) | 1 | 4 | 1.7km |
| South Lambeth & Stockwell (SW8) | 8 | 5 | 1.8km |
| Stockwell & Brixton (SW9) | 6 | 5 | 1.8km |
| Balham (SW12) | 4 | 5 | 1.8km |
Neighbours are the outcodes nearest SW4, 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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