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Does PO6 4TN flood?

Up to Very low likelihood

Properties in PO6 4TN sit in the Environment Agency's Very 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%00
Very lowbelow 0.1%108

Over a 25-year mortgage, a property in a very low-likelihood area has less than a 3% chance of flooding at least once.

The ground around PO6 4TN

The ground here sits at about 3 m above sea level and falls 21 m across the surrounding 800 m. Surface water reaching this point runs off ground lying to the north, 10.3 m higher.

Shaded relief map of the ground around PO64TN, computed from Environment Agency LiDAR. The ground here sits at about 3 m above sea level and falls 21 m across the surrounding 800 m. Surface water reaching this point runs off ground lying to the north, 10.3 m higher.
Shaded relief of the bare ground within about 400 m of PO6 4TN, 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 PO6 4TN — £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 4TN

FloodRadarProperty Flood-Risk Report
PO6 4TN
Moderate flood risk — investigate further

Because properties in the very low likelihood band; 419 official warnings since 2006.

B 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 Very low
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

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

419
flood alerts & warnings within 10 km since 2011
53
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 4TN

GaugeRiverDistanceTypical highHighest on record
NORTH FAREHAM GS — 5.1 km — —
Denmead River Wallington 6.0 km 34.20 m 34.23 m
Browndown River Alver 7.7 km 1.60 m 1.72 m
Havant Hermitage Stream 7.7 km 6.20 m 6.69 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
Cow Lane Portchester Ceo Portsmouth Harbour 1.2 km 1 (2024) 0
Wicor Mill Lane Portchester Ceo Portsmouth Harbour 2.7 km 6 (2024) 11
Cosham Ps Ports Creek 2.9 km 19 (2024) 73
Gruneison Road Storm Ps Portsmouth Harbour 3.0 km 2 (2024) 2

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

Flood defences

9 mapped flood-defence assets within 500 m — nearest ~188 m (engineered high ground, embankment, 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 4PY 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

At-risk postcodes near PO6 4TN — 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. 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.