Flood Risk In England: How The Environment Agency Classifies Flood Risk

The bands describe the chance of flooding today for each source, with defences counted. The zones describe land for planning, without defences and for rivers and the sea only. This page explains both, who manages each source of flooding, and how England's system differs from those in Wales, Scotland and Northern Ireland.

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How Is Flood Risk Classified In England?

Flood risk in England is classified by the Environment Agency's National Flood Risk Assessment, which gives each area a flood risk band for rivers and the sea and for surface water, and separately by Flood Zones used in planning. The two classifications answer different questions and can disagree for the same address.

The two English classifications are set out below.

The national assessment was published on 17 December 2024 and models risk at 2 metre resolution. What each band means is explained in flood risk levels, and each zone in Flood Zones explained.

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Who Is Responsible For Flood Risk In England?

In England, responsibility for flood risk is split by source. The Environment Agency manages flooding from main rivers, the sea and reservoirs, and the lead local flood authority manages local flood risk from surface water, groundwater and ordinary watercourses.

The law names the bodies that manage flood risk in England as the Environment Agency, lead local flood authorities, district councils where there is no unitary authority, internal drainage boards, water companies and highway authorities. Their roles are set out below.

To report flooding from a main river or the sea, call the Environment Agency on 0800 80 70 60. Surface water and groundwater flooding are reported to the local council.

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How Do You Check Flood Risk In England?

The flood risk of any address in England is shown by entering its postcode into the checker on this site, which returns the flood risk band for each source and the Flood Zone together. The Environment Agency publishes the same information in two separate GOV.UK services.

The official services are:

1. Check your long term flood risk — the flood risk band for rivers and the sea, surface water, reservoirs and groundwater where data exists. The Environment Agency states that it does not tell you how likely it is that an individual property will flood.
2. Flood Map for Planning — the Flood Zone, the "Flood Zones plus Climate Change" extent and surface water risk, for planning applications.
3. Flood warnings — a free Environment Agency service by phone call, text or email; sign up online or call Floodline on 0345 988 1188.

The band and the zone for one postcode appear side by side through check the flood risk of any UK postcode. Live warnings in force across England are listed on flood warnings.

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How Does England's System Compare With The Rest Of The UK?

England is the only UK nation whose planning Flood Zone 3 is split into 3a and 3b. Wales uses similar bands but different Flood Zones, Scotland has no Flood Zones, and Northern Ireland plans around defined floodplains.

The four systems are compared below.

The property figures are not directly comparable: each agency counts at risk differently, covers different sources and publishes on a different date. Unlike Wales, England's planning zones leave out both climate change and surface water. Each system is explained on flood risk in Wales, flood risk in Scotland and flood risk in Northern Ireland.

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Which Areas Of England Have The Highest Flood Risk?

The towns and cities in England with more than a quarter of their homes in a Medium or High flood risk band for rivers and the sea. Surface water risk follows a different pattern, because it is not tied to rivers or coasts.

The Environment Agency reports that There are wide regional variations in flood risk. The places in England with the highest share of homes at risk are listed below, with each county's own page ranking the towns within it.

1. Goole flood risk High 86.5% of homes at Medium or High 7 addresses at surface water risk
2. Spalding flood risk Medium 81.5% of homes at Medium or High Lincolnshire · 248 addresses at surface water risk
3. Stainforth flood risk High 67.1% of homes at Medium or High 50 addresses at surface water risk
4. Dunscroft and Hatfield flood risk High 54.5% of homes at Medium or High 257 addresses at surface water risk
5. Wisbech flood risk Medium 43% of homes at Medium or High Cambridgeshire · 671 addresses at surface water risk
6. Bentley (Doncaster) flood risk Medium 39.2% of homes at Medium or High 410 addresses at surface water risk
7. Old Windsor and Wraysbury flood risk High 37.6% of homes at Medium or High 121 addresses at surface water risk
8. Coningsby and Tattershall flood risk High 37.5% of homes at Medium or High Lincolnshire · 211 addresses at surface water risk
9. Moorends flood risk Medium 35.6% of homes at Medium or High 192 addresses at surface water risk
10. Chertsey flood risk High 35% of homes at Medium or High Surrey · 241 addresses at surface water risk
11. Preesall and Knott End-on-Sea flood risk High 34.4% of homes at Medium or High Lancashire · 133 addresses at surface water risk
12. Shepperton flood risk High 32.6% of homes at Medium or High Surrey · 53 addresses at surface water risk
13. Egham flood risk High 28.2% of homes at Medium or High Surrey · 964 addresses at surface water risk
14. Todmorden flood risk High 28.1% of homes at Medium or High 690 addresses at surface water risk
15. Cleethorpes flood risk High 26.6% of homes at Medium or High 1,464 addresses at surface water risk

Counties in England

1. flood risk in Cambridgeshire 5 districts ranked · 6% of homes at Medium or High
2. flood risk in Derbyshire 8 districts ranked · 1.1% of homes at Medium or High
3. flood risk in Devon 8 districts ranked · 3.8% of homes at Medium or High
4. flood risk in East Sussex 5 districts ranked · 1.8% of homes at Medium or High
5. flood risk in Essex 12 districts ranked · 1.1% of homes at Medium or High
6. flood risk in Gloucestershire 6 districts ranked · 2.3% of homes at Medium or High
7. flood risk in Hampshire 11 districts ranked · 1.2% of homes at Medium or High
8. flood risk in Hertfordshire 10 districts ranked · 0.9% of homes at Medium or High
9. flood risk in Kent 12 districts ranked · 2.2% of homes at Medium or High
10. flood risk in Lancashire 12 districts ranked · 2.5% of homes at Medium or High

The full ranking for the UK, with its method, is on most flooded towns in the UK.

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What Does Flood Risk Mean For Planning In England?

In England, flood risk shapes planning through Flood Zones, the sequential test and the exception test, set out in the National Planning Policy Framework published on 17 August 2026. Development is steered to the lowest-risk land first, and some uses are refused in the highest-risk zones.

Four rules decide most applications:

1. A site-specific flood risk assessment accompanies development in Flood Zones 2, 3a and 3b, and in Flood Zone 1 on sites of 1 hectare or more, in areas with critical drainage problems, or where risk from any source is shown now or in future.
2. The sequential test steers development away from land at risk where a lower-risk site is reasonably available; householder development is exempt.
3. The exception test has three criteria: three: wider sustainability benefits that outweigh the flood risk; safe for its anticipated lifetime; not increase flood risk elsewhere and, where possible, reduce flood risk overall.
4. Some uses should be refused outright, such as highly vulnerable development in Flood Zone 3a.

What each type of building work needs is covered in building in a flood zone.

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What Does Flood Risk Mean For Insurance In England?

Flood cover in England is part of a standard home insurance policy, and flood risk affects its price and excess. Homes built before 1 January 2009 can be eligible for Flood Re, which covers the whole of the UK apart from the Isle of Man and the Channel Islands.

Insurers set premiums with their own underwriting methods; the Environment Agency states that NaFRA was not developed or tested for insurance underwriting or setting insurance premiums. Specialist providers for homes that standard insurers will not cover are listed in the BIBA and ABI Flood Insurance Directory, on 0370 950 1790. How premiums, excesses, refused cover and previously flooded homes work is explained in flood insurance, and the scheme's rules in Flood Re.

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Sources (Verified 16 Sep 2026)