Does Waterlooville flood?

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

Ordnance Survey places 36 postcodes in Waterlooville 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 245 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 Waterlooville

Environment Agency gauges within 10 km of Waterlooville watch River Wallington, Hermitage Stream, River Lavant, West Brook, River Ems, River Meon.

• Denmead
  River Wallington · 1.3 km away 33.24 mAOD
  normal range · rising · 32 min ago
• Havant
  Hermitage Stream · 5.0 km away 5.08 mAOD
  normal range · steady · 32 min ago
• Crosslands Drive
  River Lavant · 5.5 km away 0.12 mASD
  normal range · steady · 32 min ago
• West Street
  River Lavant · 5.7 km away 7.07 mAOD
  normal range · steady · 32 min ago
• Emsworth
  West Brook · 8.4 km away 2.11 mAOD
  normal range · just past its peak · 32 min ago
• Westbourne
  River Ems · 8.5 km away 0.09 mASD
  normal range · steady · 47 min ago
• North Fareham weir Structure
  River Wallington · 9.1 km away 0.12 mASD
  controlled by a sluice or weir · 32 min ago
• Mislingford
  River Meon · 9.3 km away 0.22 mASD
  normal range · steady · 32 min ago

Distances are from the middle of Waterlooville'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 Waterlooville

28 Environment Agency flood warning areas lie within 10 km of Waterlooville. The EA has issued 568 flood warnings and alerts for them since 2006, most recently on 18 Mar 2026.

• Mead End Stream at Denmead 2.1 km
• Mead End Stream at Denmead
  3 warnings and alerts since 2006, latest Feb 2026 2.1 km
• Areas at risk of groundwater flooding in Denmead in Hampshire, including Anmore Road
  9 warnings and alerts since 2006, latest Mar 2026 2.1 km
• Hermitage Stream from Leigh Park to Bedhampton
  4 warnings and alerts since 2006, latest Feb 2026 3.9 km
• Leigh Park, New Road and Mill Lane Old Bedhampton on the Hermitage Stream 3.9 km
• River Wallington from World's End to Wallington
  15 warnings and alerts since 2006, latest Feb 2026 5.2 km
• Eastern Road, Havant Town Centre, Park Road North and South and Brockhampton Road on the Lavant Stream
  2 warnings and alerts since 2006, latest Jan 2023 5.5 km
• Areas at risk of groundwater flooding in Hambledon in Hampshire
  80 warnings and alerts since 2006, latest Mar 2026 5.6 km
• Tidal areas from North Harbour to Brockhampton, including Port Solent, Horsea Island, Highbury and Farlington Marshes 5.7 km
• Coastal area from Port Solent to Brockhampton including Farlington Marshes
  11 warnings and alerts since 2006, latest Apr 2024 5.7 km
• West Leigh, Crosslands Drive and Lavant Road on the Lavant Stream
  2 warnings and alerts since 2006, latest Feb 2026 5.7 km
• Lavant Stream from Woodberry Lane to Langstone and Brockhampton
  3 warnings and alerts since 2006, latest Feb 2026 5.8 km

Recorded floods near Waterlooville

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

• 5 Mar 2014 — East Hampshire Winter 13/14 Other
• 22 Feb 2014 — Enmore Road, Denmead, Winter 13/14 Other
• 21 Jan 2014 — Hambledon, Winter 13/14 Main river
• 1 Dec 2002 — Winter 2002/03gw_Lavant Stream_Aerial(1) Ephemeral watercourse
• 1 Dec 2000 — Winter 2000/01g_Lavant Stream_Havant
• 1 Nov 2000 — Winter 2000/01gw_River Wallington_Hambledon Main river
• 1 Nov 2000 — Winter 2000/01g_North Purbrook Heath_Purbrook
• 9 Oct 2000 — 09/10/2000_River Wallington_Waterlooville (1)
• 9 Oct 2000 — 09/10/2000_River Wallington_Waterlooville (2)
• 1 Oct 2000 — Winter 2000/01gw_River Wallington_Denmead Ephemeral watercourse
• 1 Jan 2000 — General_Lavant Stream_Havant(1)
• 7 Mar 1991 — 07/03/1991_Brockhampton Stream_Brockhampton Main river

…and 1 earlier recorded flood on the map.

Rainfall near Waterlooville

The nearest rain gauge, Rainfall station (4.7 km away), recorded 6.0 mm in the last 24 hours and 32.9 mm in the last 7 days (latest reading 47 min ago).

At-risk postcodes in Waterlooville

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

High likelihood (17)

Medium likelihood (3)

Low likelihood (15)

Very low likelihood (1)

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.