Does PO30 4JN flood?

Up to High likelihood

Properties in PO30 4JN 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%	6	1
Medium	1% – 3.3%	0	0
Low	0.1% – 1%	4	2
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 PO30 4JN

The ground here sits at about 30 m above sea level and falls 36 m across the surrounding 800 m. Surface water reaching this point runs off ground lying to the south-east, 29.0 m higher.

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Get the full flood report for PO30 4JN — £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 PO30 4JN

FloodRadarProperty Flood-Risk Report

PO30 4JN

Elevated flood risk — professional assessment recommended

Because properties in the high likelihood band; 1 recorded flood nearby; 201 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: Yes ⚑ Flood defences within 500 m: Yes ⚑ In flood zone 2 or 3: ···

Rivers & sea

Up to High

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

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 PO30 4JN. 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 PO30 4JN

201

flood alerts & warnings within 10 km since 2011

of them full flood warnings or severe warnings

2026

most recent warning nearby (2026-02-18)

Warnings cover flood areas, not individual addresses.

Recorded floods near this postcode

Date	Recorded flood	Approx. distance
Dec 1993	30/12/93_Calbourne_Newbridge	~0.9 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, 21 warnings nearby) · Eleanor (2018, 5 warnings nearby) · Chandra (2026, 4 warnings nearby) · Henk (2024, 3 warnings nearby)

The rivers that matter for PO30 4JN

Gauge	River	Distance	Typical high	Highest on record
Freshwater	Western Yar	7.2 km	1.02 m	1.19 m
CARISBROOKE GS	—	7.9 km	—	—
Carisbrook Mill	Lukely Brook	7.9 km	0.38 m	0.81 m
Atherfield	Atherfield Brook	8.0 km	1.52 m	1.52 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
Calbourne Wwtw	Caul Bourne	0.6 km	112 (2024)	1,953
Newbridge Road Newbridge Ceo	Caul Bourne	0.7 km	29 (2024)	58
Westway Springhill Ceo	The Caul Bourne	1.1 km	24 (2024)	126
Mill Lane Shalfleet Wps	Newtown River	2.6 km	1 (2024)	0

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 ~33 m (natural high ground). 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

PO30 4AG up to Medium PO30 4AJ up to Low PO30 4BB up to Low PO30 4BD up to High PO30 4BE up to Low PO30 4BL up to Medium PO30 4BP up to Low PO30 4BQ up to Low PO30 4DJ up to High PO30 4EJ up to High PO30 4ER up to High PO30 4JF up to High

At-risk postcodes near PO30 4JN — all in the PO30 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 PO30 district.