Does PO6 4PY flood?

Portsmouth, City of Portsmouth

Up to High likelihood

Properties in PO6 4PY sit in the Environment Agency's High 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 band	Annual chance	Properties	Of which homes
High	greater than 3.3%	5	1
Medium	1% – 3.3%	53	9
Low	0.1% – 1%	6	4
Very low	below 0.1%	0	0

Over a 25-year mortgage, a property in a high-likelihood area has at least a 57% chance of flooding at least once.

The ground around PO6 4PY

The ground here sits at about 3 m above sea level and falls 22 m across the surrounding 800 m. The ground contributing surface water to this point lies to the west.

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Get the full flood report for PO6 4PY — £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 PO6 4PY

FloodRadarProperty Flood-Risk Report

PO6 4PY

Elevated flood risk — professional assessment recommended

Because properties in the high likelihood band; 417 official warnings since 2006.

E 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: No ⚑ Flood defences within 500 m: Yes ⚑ In flood zone 2 or 3: ···

Rivers & sea

Up to High

Surface water

···

Groundwater

Not assessed

Historic flooding

None within ~1 km

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

Rivers & sea likelihood · illustrative

Surface water (flash flooding) · illustrative

Flood Zones 2 & 3 (planning) · illustrative

2050s projection (climate) · illustrative

The map above shows the real EA rivers & sea likelihood cells around PO6 4PY. 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 PO6 4PY

417

flood alerts & warnings within 10 km since 2011

of them full flood warnings or severe warnings

2026

most recent warning nearby (2026-03-18)

Warnings cover flood areas, not individual addresses.

Named storms that brought flooding here

2013-14 UK winter floods (2013, 87 warnings nearby) · Eleanor (2018, 7 warnings nearby) · Eunice (2022, 7 warnings nearby) · Henk (2024, 7 warnings nearby)

The rivers that matter for PO6 4PY

Gauge	River	Distance	Typical high	Highest on record
NORTH FAREHAM GS	—	4.1 km	—	—
Denmead	River Wallington	6.4 km	34.20 m	34.23 m
Browndown	River Alver	7.2 km	1.60 m	1.72 m
Wickham	River Meon	7.6 km	19.30 m	20.00 m

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

Storm overflows within 5 km

Overflow	Discharges into	Distance	Spills	Hours
Cow Lane Portchester Ceo	Portsmouth Harbour	0.5 km	1 (2024)	0
Wicor Mill Lane Portchester Ceo	Portsmouth Harbour	1.8 km	6 (2024)	11
Newmans Bridge Southwick Ceo	River Wallington	3.1 km	3 (2024)	29
Southwick Wwtw	River Wallington	3.2 km	35 (2024)	398

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

Flood defences

6 mapped flood-defence assets within 500 m — nearest ~71 m (embankment, engineered high ground, promenade). 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

PO6 4PU up to Medium PO6 4PX up to High PO6 4PZ up to Medium PO6 4QD up to Very low PO6 4QE up to High PO6 4QG up to Medium PO6 4RG up to Low PO6 4RX up to Low PO6 4RY up to Very low PO6 4SD up to Very low PO6 4SN up to Very low PO6 4SP up to Low

At-risk postcodes near PO6 4PY — all in the PO6 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 PO6 district.