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Does PO9 1AQ flood?

Havant, Hampshire

Up to Low likelihood

Properties in PO9 1AQ sit in the Environment Agency's Low flood-likelihood band (worst property). The band is the worst found in the postcode — it describes the land around properties (defence-adjusted, rivers & sea), not any single address, and not today's conditions.

Likelihood bandAnnual chancePropertiesOf which homes
Highgreater than 3.3%00
Medium1% – 3.3%00
Low0.1% – 1%94
Very lowbelow 0.1%00

Over a 25-year mortgage, a property in a low-likelihood area has a 2–22% chance of flooding at least once.

The ground around PO9 1AQ

The ground here sits at about 9 m above sea level and falls 11 m across the surrounding 800 m. Surface water reaching this point runs off ground lying to the east, 2.8 m higher.

Shaded relief map of the ground around PO91AQ, computed from Environment Agency LiDAR. The ground here sits at about 9 m above sea level and falls 11 m across the surrounding 800 m. Surface water reaching this point runs off ground lying to the east, 2.8 m higher.
Shaded relief of the bare ground within about 400 m of PO9 1AQ, computed from the Environment Agency's published LiDAR terrain survey. The ring marks the postcode centre, not a property. This shows the shape of the land, not a flood map — it does not include drains, culverts, walls or kerbs, and the official likelihood band above is the authoritative figure. © Environment Agency copyright and/or database right 2022. All rights reserved.
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Get the full flood report for PO9 1AQ — £19 Free preview first · instant access · no account needed The detail below — flood history, warnings, rivers, overflows — is part of FloodRadar's property flood-risk report. The official band above is free; the preview shows more before you decide.

Inside the full report for PO9 1AQ

FloodRadarProperty Flood-Risk Report
PO9 1AQ
Moderate flood risk — investigate further

Because properties in the low likelihood band; 3 recorded floods nearby; 679 official warnings since 2006.

C Today — indicative grade (A best → E)
··· By the 2050s — EA climate scenario (in the full report)
⚑ Official warning within 10 km: Yes ⚑ Recorded flood nearby: Yes ⚑ Flood defences within 500 m: Yes ⚑ In flood zone 2 or 3: ···
Rivers & sea
Up to Low
Surface water
···
Groundwater
Not assessed
Historic flooding
Recorded nearby
Warning history · flood map with building picker · 2050s view · insurance outlook · every dataset receipt — 18 sections

Flood-risk map of this area

Environment Agency flood-likelihood cells
High (>3.3%/yr) Medium Low Very low Marker = postcode centre Base map © OpenStreetMap contributors

The map above shows the real EA rivers & sea likelihood cells around PO9 1AQ. The small panels are illustrative previews of the report's per-layer map views — the full report draws each layer for real, plus recorded extents, defences and a building picker on an interactive map.

Official flood warnings near PO9 1AQ

679
flood alerts & warnings within 10 km since 2011
94
of them full flood warnings or severe warnings
2026
most recent warning nearby (2026-03-20)

Warnings cover flood areas, not individual addresses.

Recorded floods near this postcode

DateRecorded floodApprox. distance
Mar 2014 East Hampshire Winter 13/14 ~11.9 km
Jan 2000 General_Lavant Stream_Havant(1) ~0.5 km
Mar 1991 07/03/1991_Brockhampton Stream_Brockhampton ~0.6 km

EA Recorded Flood Outlines — absence of a record never proves a place has not flooded. The full report tests whether any extent covered the exact spot.

Named storms that brought flooding here

2013-14 UK winter floods (2013, 111 warnings nearby) · Eleanor (2018, 12 warnings nearby) · Ciara (2020, 11 warnings nearby) · Eunice (2022, 10 warnings nearby)

The rivers that matter for PO9 1AQ

GaugeRiverDistanceTypical highHighest on record
West Street River Lavant 0.4 km 7.80 m 7.66 m
Havant Hermitage Stream 1.0 km 6.20 m 6.69 m
Crosslands Drive River Lavant 1.1 km 1.43 m 1.43 m
Emsworth West Brook 2.8 km 3.00 m 3.25 m

Live levels, predictions and rain-response behaviour are on each gauge's page and in the property report.

Storm overflows within 5 km

OverflowDischarges intoDistanceSpillsHours
Budds Farm Havant Ceo Brockhampton Creek 1.3 km 5 (2024) 14
Priorsdean Crescent Havant Cso Hermitage Stream 1.5 km 1 (2024) 1
Kings Road Emsworth Cso Nore Rithe/emsworth Harbour 2.5 km 4 (2024) 31
St Andrews Road Portsmouth Cso Broom Channel 3.2 km 5 (2024) 1

Official annual EDM figures — a water-quality signal for local watercourses, not a property flood-risk factor.

Flood defences

28 mapped flood-defence assets within 500 m — nearest ~287 m (natural high ground, engineered high ground, wall). Defences reduce risk, never remove it.

What the full property report adds

The interactive flood-risk map with a building picker (your exact house, not the postcode), the 2050s climate view, surface-water and planning flood zones at your building, exact recorded-flood distances, year-by-year warning charts, watercourses including culverted streams, an insurance outlook with the Flood Re rules, and a printable document with every dataset receipt — start with the free preview, unlock for £19.

Flood risk at nearby postcodes

PO9 1AA up to Low PO9 1BH up to Low PO9 1BJ up to Low PO9 1BL up to Low PO9 1BN up to Medium PO9 1BU up to Low PO9 1DA up to Low PO9 1DD up to Low PO9 1DE up to High PO9 1DH up to Medium PO9 1DJ up to Low PO9 1DQ up to Low

At-risk postcodes near PO9 1AQ — all in the PO9 district.

© Environment Agency copyright and/or database right 2025. All rights reserved. Some features of this map are based on digital spatial data from the Centre for Ecology & Hydrology, © NERC (CEH). © Crown Copyright and Database Rights 2025 OS AC0000807064. This product is produced in part from PAF® and Multiple Residence Data, the copyright in which is owned by Royal Mail Group Limited and/or Royal Mail Group plc. All rights reserved. Licence number AC0000807064. Place names: Contains OS data © Crown copyright and database rights 2026. Contains Royal Mail data © Royal Mail copyright and database right 2026. Contains National Statistics data © Crown copyright and database right 2026. Licensed under the Open Government Licence v3.0. Recorded Flood Outlines and warning history © Environment Agency copyright and/or database right 2025. Storm-overflow figures: EA Event Duration Monitoring. Flood defences © Environment Agency (OGL v3). This page summarises public area-level data — it is not a flood-risk survey and not a substitute for the official GOV.UK service. All data sources & licences. More postcodes: the PO9 district.