Does HA0 4AU flood?

Up to High likelihood

Properties in HA0 4AU 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%	10	6
Medium	1% – 3.3%	0	0
Low	0.1% – 1%	0	0
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 HA0 4AU

The ground here sits at about 36 m above sea level and falls 19 m across the surrounding 800 m. Surface water reaching this point runs off ground lying to the north-east, 3.4 m higher.

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Get the full flood report for HA0 4AU — £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 HA0 4AU

FloodRadarProperty Flood-Risk Report

HA0 4AU

Elevated flood risk — professional assessment recommended

Because properties in the high likelihood band; 2 recorded floods nearby; 1,268 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 HA0 4AU. 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 HA0 4AU

1,268

flood alerts & warnings within 10 km since 2008

of them full flood warnings or severe warnings

2026

most recent warning nearby (2026-08-15)

Warnings cover flood areas, not individual addresses.

Recorded floods near this postcode

Date	Recorded flood	Approx. distance
Nov 2013	Winter 2013/2014	~40.2 km
Jan 1977	06AugustSummer1977	~1.6 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, 22 warnings nearby) · Ashley (2024, 6 warnings nearby) · Dennis (2020, 5 warnings nearby) · Lilian (2024, 4 warnings nearby)

The rivers that matter for HA0 4AU

Gauge	River	Distance	Typical high	Highest on record
Wembley	Wealdstone Brook	1.8 km	2.22 m	1.67 m
Brent, Monks Park	River Brent	2.0 km	1.80 m	2.56 m
Greenford, Costons Lane	River Brent	4.2 km	1.11 m	1.75 m
Hanwell	River Brent	5.6 km	3.49 m	2.73 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
Lyon Park Avenue	Wembley Brook	0.2 km	3 (2024)	4
Sudbury Heights Ave, Allendale Road	Wembley Brook	1.5 km	0 (2024)	0
District Road	Wembley Brook	1.6 km	3 (2024)	2
N/a	N/a	1.6 km	2 (2024)	4

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

Flood defences

3 mapped flood-defence assets within 500 m — nearest ~226 m (engineered high ground, 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

HA0 4AE up to High HA0 4AN up to High HA0 4AR up to High HA0 4AT up to High HA0 4AY up to High HA0 4AZ up to Low HA0 4BA up to High HA0 4DB up to High HA0 4DN up to High HA0 4DR up to Medium HA0 4DX up to Medium HA0 4DY up to Low

At-risk postcodes near HA0 4AU — all in the HA0 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 HA0 district.