Data sources current as of July 2026
Am I in a flood zone? Enter your UK postcode at the top of this page for an instant answer. LocalRisk returns an Environment Agency flood-risk band (from NaFRA2 flood-likelihood data) for England, or the equivalent SEPA band for Scotland and NRW band for Wales, in roughly five seconds. Try example postcodes like HU3 1XL (Hull), YO23 1LN (York) or L11 1EE (Liverpool) to see High flood-band results, or enter any UK postcode above. The Environment Agency estimates around 1 in 4 properties in England is in an area at risk of flooding, so a quick postcode check before buying, renting or insuring is worth doing. Below is a free guide to what each flood zone means, how to read the band returned for your postcode, the difference between a postcode-level check and the official address-level service, and how flood-zone classification affects insurance availability and price.
| UK nation | Flood data source | Coverage on LocalRisk |
|---|---|---|
| England | Environment Agency (NaFRA2) | Live |
| Scotland | SEPA | Live |
| Wales | Natural Resources Wales | Live |
| Northern Ireland | DfI Rivers | Not yet integrated |
| Flood Zone (England) | Annual probability | LocalRisk band |
|---|---|---|
| Zone 1 | Less than 0.1% | Very Low |
| Zone 2 | 0.1% to 1% | Lower |
| Zone 3a (lower part) | 1% to 3.3% annual probability | Medium |
| Zone 3a (upper part) and Zone 3b | 3.3% or greater annual probability | Higher |
Enter your UK postcode at the top of this page for an area-level flood-zone answer in about five seconds. LocalRisk returns an Environment Agency NaFRA2 flood-risk band for England, an SEPA band for Scotland, or a Natural Resources Wales band for Wales, alongside a comparison to the rest of your council so you can see whether you sit above or below the local norm. Around 6.3 million properties in England (roughly 1 in 4) are in an area at some risk of flooding from rivers, the sea, or surface water (Environment Agency NaFRA2, 2024). For an address-specific check before buying, renting, or insuring, the Environment Agency's free Check Your Long-Term Flood Risk service is the official source for England. Wales uses NRW's Long Term Flood Risk Map; Scotland uses SEPA's Flood Maps. Northern Ireland flood data from DfI Rivers is not yet integrated on LocalRisk.
More than most people expect - flood risk varies street by street rather than town by town. In LocalRisk's analysis of Environment Agency NaFRA2 data (July 2026), 2,096 of the 2,206 English postcode districts in the EA's property-level flood dataset - 95% - contain both Very Low and High rated postcodes. Croydon's CR0 district alone holds over 500 postcodes with a High-rated address and more than 1,300 rated Very Low. A town's reputation says little about a specific address, which is why a postcode-level check is the meaningful starting point, refined by the Environment Agency's address-level flood maps.
Properties in UK high-risk flood areas have greater than a 1 in 30 chance of flooding in any given year - a 3.3% annual probability, or roughly a 29% chance over a 10-year period. The Environment Agency defines this band using its NaFRA2 model, which combines river, sea, and surface water flood likelihoods at a 50-metre grid resolution across England. Scotland and Wales use equivalent High likelihood bands published by SEPA and Natural Resources Wales respectively. High-risk areas are most often found on the floodplain of major rivers (the Severn, Thames, Aire, Ouse, Trent) and along low-lying coast such as the Lincolnshire Wash and the Somerset Levels. LocalRisk shows this as a Higher band for any UK postcode, alongside the council-level share of properties in the higher band so you can see whether the wider area is similarly exposed or whether your postcode is unusual.
A postcode is in Environment Agency Flood Zone 3 if its annual probability is above 1% from rivers or 0.5% from the sea, but LocalRisk's Higher band is more specific than that: it covers the upper part of Zone 3a and all of Zone 3b (3.3% or greater annual probability, roughly a 1-in-30 chance or more often). The lower part of Zone 3a (1% to 3.3%) shows as Medium on LocalRisk. Zone 3 is split into 3a (the bulk of high-risk land) and 3b (functional floodplain, the most restrictive planning category). Enter your postcode above to see your exact band, and use the EA's Check Your Long-Term Flood Risk service for address-level confirmation before any property transaction.
Enter your postcode at the top of this page for an instant area-level flood-risk band. Results use Environment Agency data for England, NRW for Wales and SEPA for Scotland; Northern Ireland flood data is not yet covered. For an address-specific check, the EA's Check Your Long-Term Flood Risk service is the official source.
The Environment Agency uses four flood-zone classifications by annual probability. Zone 1: less than 0.1% (lowest). Zone 2: 0.1% to 1%. Zone 3a (lower part): 1% to 3.3% from rivers or sea. Zone 3a (upper part) and Zone 3b (functional floodplain): 3.3% or greater. LocalRisk maps these to Very Low (Zone 1), Lower (Zone 2), Medium (Zone 3a lower part) and Higher (Zone 3a upper part and Zone 3b).
Flood Zone 3 is the Environment Agency's high-probability flood-zone classification for England. It covers land with greater than 1% annual probability of river flooding, or greater than 0.5% from the sea - roughly a 1-in-100 chance or more often per year. Zone 3 is sub-divided into Zone 3a (the bulk of high-risk land, where new development is restricted) and Zone 3b (the functional floodplain, the most restrictive planning category, where most new building is not permitted). Property in Zone 3 typically faces higher buildings insurance premiums and may need to be placed through the government-backed Flood Re scheme, available for eligible homes built before 1 January 2009. Scotland's SEPA equivalent is the High likelihood band; Wales uses the same EA-style Zone 3 classification through Natural Resources Wales. LocalRisk maps the lower-probability part of Zone 3a (1% to 3.3% annual probability) to a Medium flood band, and Zone 3a's upper part plus Zone 3b (3.3% or greater) to a Higher flood band, and the council page above your postcode result reports the percentage of postcodes locally in the higher band.
Three levels of check are available. Free postcode-level: enter the postcode on LocalRisk for a band in 5 seconds. Free address-level: the official agency service for your nation - EA Check Your Long-Term Flood Risk (England), NRW (Wales), SEPA (Scotland) or DfI Rivers (NI). Paid: a commissioned environmental search from a regulated provider, normally arranged by your conveyancer.
Yes, it can affect both availability and cost. Insurers use their own flood models when pricing cover. The government-backed Flood Re scheme helps make insurance more affordable for eligible higher-risk homes built before 1 January 2009 (subject to council tax band caps - up to band H in England, band I in Scotland and Wales). If your postcode shows a higher flood risk, it is worth comparing quotes and checking whether Flood Re applies. The average domestic flood payout reached £30,000 in 2025, with UK insurers paying £312 million in domestic flood claims over the year (Association of British Insurers, February 2026).
Postcode data is a reliable area-level indicator for comparison and screening. In England, flood bands reflect property-level counts from EA data. For Scotland and Wales, SEPA and NRW do not publish postcode-level data - we derive bands by querying their published flood extent polygons against each postcode centroid. Properties at different ends of the same postcode can face quite different exposure. For property transactions or insurance, obtain address-specific data from the EA, check SEPA's flood maps (Scotland) or NRW (Wales) directly, or commission a professional flood risk report.
The EA's checker gives address-specific detail using detailed hydraulic modelling - it's the right tool for individual property decisions. LocalRisk combines flood risk with heat, air quality and subsidence for 1.8 million UK postcodes, so you can see the full picture for any area and compare locations side by side.
Flood zone data currently covers England, Scotland and Wales. Northern Ireland flood data is not yet included. Heat, air quality and subsidence data are available for all UK nations including Northern Ireland.
Enter the postcode at the top of this page. Welsh flood-risk bands are built on Natural Resources Wales (NRW) data - NRW is the statutory flood authority for Wales. Around one in seven properties in Wales (more than 245,000) is at risk of flooding from rivers, the sea or surface water, according to NRW. NRW does not publish postcode-level data, so LocalRisk derives each band by querying NRW's published flood extent polygons against the postcode centroid - an area-level screening reading. For address-level detail, NRW's Flood Risk Assessment Wales map on DataMapWales is the authoritative source.