Does Chiswick flood?

What the Environment Agency's rivers-and-sea flood-risk data says about Chiswick

Ordnance Survey places 80 postcodes in Chiswick in the Environment Agency's rivers-and-sea flood-risk dataset (Risk of Flooding from Rivers and Sea). Each postcode is counted once, under the worst band any of its properties reaches; together they hold 1,401 properties in the EA dataset's likelihood bands.

This dataset covers flooding from rivers and the sea only — one of five flood sources. Surface water, groundwater, sewers and reservoirs are assessed separately, so a postcode missing from it is not proof that a place cannot flood. The band describes the land around properties (allowing for defences), not any single address and not today's conditions.

Rivers and live river levels near Chiswick

Environment Agency gauges within 10 km of Chiswick watch Beverley Brook, River Brent, Thames Tideway, River Crane, River Thames, River Wandle.

• Barnes
  Beverley Brook · 1.5 km away 1.46 mASD
  normal range · steady · 31 min ago
• Brentford Tidal
  River Brent · 4.0 km away 0.31 mASD
  rises and falls with the tide · 31 min ago
• Richmond Tidal
  Thames Tideway · 4.9 km away 1.73 mAOD
  rises and falls with the tide · 31 min ago
• Wimbledon Common
  Beverley Brook · 5.7 km away 0.22 mASD
  normal range · steady · 31 min ago
• Hanwell
  River Brent · 6.8 km away 0.94 mASD
  normal range · steady · 31 min ago
• Marsh Farm
  River Crane · 7.1 km away 0.05 mASD
  normal range · steady · 31 min ago
• Teddington Lock Structure
  River Thames · 7.4 km away 0.05 mASD
  controlled by a sluice or weir · 31 min ago
• Trowlock Island
  River Thames · 7.5 km away 4.42 mAOD
  normal range · steady · 31 min ago
• Summerstown
  River Wandle · 7.6 km away 1.06 mASD
  normal range · rising · 46 min ago
• Brent, Monks Park
  River Brent · 7.7 km away 0.07 mASD
  normal range · steady · 31 min ago
• Greenford, Costons Lane
  River Brent · 8.0 km away 0.28 mASD
  normal range · falling · 31 min ago
• New Malden
  Beverley Brook · 8.0 km away 0.79 mASD
  normal range · steady · 31 min ago

Distances are from the middle of Chiswick's at-risk postcodes. Tidal and structure gauges are shown as readings only — the tide and sluice gates move them, not floods. A gauge with no recent reading shows no level.

Flood warning areas near Chiswick

47 Environment Agency flood warning areas lie within 10 km of Chiswick. The EA has issued 1,265 flood warnings and alerts for them since 2006, most recently on 15 Aug 2026.

• River Thames from the Hogarth Lane Roundabout to the River Brent including South Chiswick, Grove Park, Strand-on-the-Green and Brentford 1.0 km
• River Thames from Putney Bridge to Mortlake High Street East including Barnes 1.2 km
• River Thames including areas in the boroughs of Kensington & Chelsea, Hammersmith & Fulham, Ealing and Hounslow
  2 warnings and alerts since 2006, latest Feb 2008 1.2 km
• River Thames from Putney Bridge to the Hogarth Lane Roundabout including Fulham Palace, Craven Cottage, the Hammersmith Flyover, Furnival Gardens and South Chiswick 1.2 km
• Beverley Brook at Barnes, London Boroughs of Richmond upon Thames and Wandsworth 1.7 km
• River Thames including areas in the boroughs of Wandsworth and Richmond-upon-Thames
  2 warnings and alerts since 2006, latest Feb 2008 1.7 km
• River Thames at Chiswick including Ravenscourt Park, west Shepherd's Bush, Stamford Brook, Turnham Green and Chiswick Park 1.8 km
• River Thames at Hammersmith and West Kensington including central Hammersmith, Olympia, Brook Green and West Kensington 2.7 km
• River Thames riverside from Putney Bridge to Teddington Weir
  906 warnings and alerts since 2006, latest Aug 2026 2.8 km
• River Thames from Mortlake High Street East to Richmond Bridge including Mortlake, North Sheen, Kew, the Royal Botanic Gardens and Old Deer Park 2.8 km
• River Thames at north Fulham including Stamford Bridge, areas to the west of Earls Court, Barons Court and West Kensington 3.3 km
• River Thames at south Fulham including north Parsons Green, Walham Green and Eel Brook Common 3.6 km

Recorded floods near Chiswick

Floods whose mapped extent (EA Recorded Flood Outlines) reached within ~5 km of Chiswick, most recent first. Absence of a record does not mean a place has never flooded. See them on the map →

• 23 Nov 2013 — Winter 2013/2014 Other
• 1 Jan 1999 — 06JanuaryWinter1999 Main river
• 1 Jan 1965 — 06NovemberWinter1965 Main river
• 6 Jan 1928 — TTD_FEO_1928 Main river

Rainfall near Chiswick

The nearest rain gauge, Rainfall station (3.9 km away), recorded 10.0 mm in the last 24 hours and 10.0 mm in the last 7 days (latest reading 1 h ago).

At-risk postcodes in Chiswick

Every postcode Ordnance Survey places in Chiswick that appears in the EA's rivers-and-sea dataset, worst band first. Each links to its own flood-risk page.

High likelihood (3)

Low likelihood (2)

Very low likelihood (75)

Postcode districts

Sources

FloodRadar summarises public flood data. It is not a flood-risk survey of any property, and it does not replace official GOV.UK flood warnings or the GOV.UK long-term flood risk service.