England's flood zones on a map you can search by postcode: Flood Zone 3 (dark blue) and Flood Zone 2 (light blue) from rivers and the sea. Tap anywhere to see the zone and every other planning constraint there, or paste a whole list of addresses below.
Quick answer
Flood Zone 3 is land with a high chance of flooding from rivers (1% or more a year) or the sea (0.5% or more), Flood Zone 2 a medium chance (0.1% to 1% from rivers, 0.1% to 0.5% from the sea), and everywhere else is Flood Zone 1, a low chance. The zones ignore flood defences and leave out flooding from heavy rain (surface water). The blue areas on the map are Flood Zones 2 (light) and 3 (dark); for flood warnings in force today, see the live flood map.
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Or paste one address per line
UK addresses with a postcode, or postcodes on their own. Only the address is used for the check.
Dark blue is Flood Zone 3 and light blue Flood Zone 2, for rivers and the sea, as published on planning.data.gov.uk; land outside them is Flood Zone 1. Tap any spot, or check a list, for the zone from the Environment Agency's current release (July 2026), which can differ at the edges where the map has been updated. Switch on other layers to see green belt, conservation areas, Article 4 directions, tree preservation orders and listed buildings in the same place.
Planning: any application in Flood Zone 2 or 3 needs a flood risk assessment, and national policy steers new homes to Flood Zone 1 first. Buying, lending and insuring: a zone is one of the first things a surveyor, lender or insurer looks at. Portfolios: paste every property in a book into the checker to see which sit in Flood Zone 2 or 3.
Flood zones cover rivers and the sea only and ignore flood defences. Surface water flooding from heavy rain puts more properties in England at risk than rivers and the sea do, and isn't part of the zones. The zones cover England: Wales, Scotland and Northern Ireland publish their own flood maps.
A screening map, not a flood risk assessment. For a planning application, get the official flood map for planning report from GOV.UK.
Where can I see a flood risk map for England?
On this page: the Environment Agency's current Flood Zones 2 and 3 for rivers and the sea, searchable by postcode, with every other planning constraint a tap away.
What do the blue areas mean?
Flood Zones 2 and 3: a medium or high chance of flooding from rivers or the sea in any year, ignoring defences. Land outside them is Flood Zone 1, a low chance.
Is my house at risk of flooding?
The map shows the flood zone for the land, not the house. A home in Flood Zone 3 can still be dry for decades, and one in Flood Zone 1 can flood from heavy rain, which the zones leave out.
Can I check a whole list of addresses?
Yes. Paste up to 5,000 addresses or postcodes, or upload a spreadsheet. The first 25 show straight away; a work email checks the rest and gives you the whole list as a CSV.
Are there flood warnings in force now?
Flood zones are long-term. For the Environment Agency's flood warnings and alerts in force today, see the live flood map.
The checker reports every constraint we hold for each site: green belt, conservation area, Article 4, tree preservation orders, listed buildings, flood zone and national landscape. From Claude, the InstaMaps connector checks a whole sheet the same way and writes the answers back into it.