Does Brentwood flood?

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

Ordnance Survey places 20 postcodes in Brentwood 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 160 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 Brentwood

Environment Agency gauges within 10 km of Brentwood watch River Wid, River Ingrebourne, River Roding, River Crouch.

• Mountnessing
  River Wid · 2.8 km away 0.47 m
  normal range · rising · 34 min ago
• Wardropers
  River Wid · 5.6 km away 0.69 m
  normal range · rising · 34 min ago
• Harold Park
  River Ingrebourne · 5.8 km away 1.10 m
  normal range · rising · 34 min ago
• Shonks Mill Bridge
  River Roding · 8.4 km away 0.45 m
  normal range · 34 min ago
• Noak Bridge
  River Crouch · 8.5 km away -0.66 mAOD
  normal range · just past its peak · 34 min ago

Distances are from the middle of Brentwood'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 Brentwood

4 Environment Agency flood warning areas lie within 10 km of Brentwood. The EA has issued 65 flood warnings and alerts for them since 2006, most recently on 24 Oct 2026.

• The River Ingrebourne at Harold Park including Harold Wood
  1 warning or alert since 2006, latest Jun 2016 7.2 km
• The River Roding from Ongar to Stapleford including Hallsford Bridge, and Shonk's Mill
  no warning on record since 2006 9.1 km
• The River Ingrebourne at Harold Park and Hornchurch including Harold Wood, Upminster and Rainham
  28 warnings and alerts since 2006, latest Oct 2026 9.7 km
• The River Crouch from Noaks Bridge to Runwell, including Wickford
  36 warnings and alerts since 2006, latest Jan 2025 9.9 km

Recorded floods near Brentwood

Floods whose mapped extent (EA Recorded Flood Outlines) reached within ~5 km of Brentwood, most recent first. Records, not floods: no outline on the record is not evidence a place has not flooded. See them on the map →

• 14 Jul 2012 — ea06JulySummer2012 Main river
• 18 Jan 2011 — ea06JanuaryWinter2011 Main river
• 14 Feb 2007 — 06FebruaryWinter2007 Main river
• 21 Oct 2001 — 06OctoberAutumn2001 Main river
• 1 Oct 1993 — 06OctoberAutumn1993 Main river
• 1 Jan 1993 — 06OctoberAutumn1993 Main river
• 1 Jan 1992 — 06OctoberAutumn1992 Main river
• 1 Jan 1987 — 06SeptemberSummer1987 Main river
• 1 Jan 1978 — 06MaySpring1978 Main river
• 1 Jan 1974 — 06NovemberAutumn1974 Main river
• 12 Jan 1968 — 1968 September Flood Outline Main river
• 1 Jan 1968 — 06SeptemberAutumn1968 Main river

…and 3 earlier recorded floods on the map.

Rainfall near Brentwood

Brentwood gets about 610 mm of rain a year on average (wettest month October, 69 mm; driest March, 37 mm). That is 48% drier than the UK as a whole, which averages 1,163 mm a year. Source: Met Office HadUK-Grid 1991–2020 (5 km grid), 3.1 km from the place centre.

The nearest rain gauge, Rainfall station (4.6 km away), recorded 3.6 mm in the last 24 hours and 48.8 mm in the last 7 days (latest reading 34 min ago).

At-risk postcodes in Brentwood

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

High likelihood (13)

Medium likelihood (3)

Low likelihood (4)

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.