Photo: Stephen Craven · CC BY-SA 2.0Selby is a river town: 12% of its homes are at high or medium risk from rivers or the sea, more than in 96% of UK towns
On the Environment Agency’s maps, which allow for flood defences, “high or medium” means at least a 1 in 100 chance of flooding from rivers or the sea in any year. Hazard risk puts Selby at D−: #50 of 54 in North Yorkshire.
What stands out about Selby’s hazards
From the Environment Agency’s maps and records and the BGS radon atlas, below.
What Selby faces
Each hazard against its own yardstick; meters run from low to high on that yardstick.
Rivers and the sea
Surface water
Past floods
The River Ouse
Flood warnings
Radon
Selby grades D− for hazard risk
Flood risk from rivers and the sea, against all UK towns.
The share of homes at high or medium risk from rivers and the sea, ranked against every UK town of 1,000 or more: fewer homes at risk is better. Towns with none at high or medium risk are ordered by their share at low risk, so they don’t all share one score. Surface water and radon aren’t graded: they are described below.
Where the water goes in Selby
Turn layers on and off. Blue is the risk from rivers and the sea; pink is where heavy rain collects. Both allow for flood defences.
The river and sea risk follows the River Aire, the River Ouse and the Selby Dam. Surface-water risk is patchier: dips, underpasses and small streams.
12% of Selby’s homes are at high or medium risk from rivers or the sea
The Environment Agency’s national map, allowing for defences. A further 80% are at low risk.
Share of each UK town’s homes at high or medium risk from rivers and the sea. 35% of UK towns have none; Selby has more than 96% of towns.
| # | Town | People | High or med. | |
|---|---|---|---|---|
| 1 | Little Hulton Greater Manchester | 25,824 | 0% | |
| 2 | Coseley West Midlands | 25,206 | 0% | |
| 3 | Wickersley and Bramley South Yorkshire | 24,653 | 0% | |
| … | ||||
| 300 | St Ives Cambridgeshire | 16,818 | 11% | |
| 301 | Skipton North Yorkshire | 15,050 | 11% | |
| 302 | Selby North Yorkshire | 19,480 | 12% | |
| 303 | Gainsborough Lincolnshire | 21,899 | 12% | |
| 304 | Skegness Lincolnshire | 20,701 | 13% | |
| … | ||||
| 309 | Dunscroft and Hatfield South Yorkshire | 14,000 | 51% | |
| 310 | Goole East Riding of Yorkshire | 20,173 | 94% | |
UK towns of 14,000 to 27,000 people.
The Environment Agency’s Risk of Flooding from Rivers and Sea (NaFRA2, June 2026) counts each postcode’s homes by band; the shares weight those postcodes by Census 2021 households. The EA counts include homes built since 2021.
Rivers and the sea, more than heavy rain, are Selby’s flood risk
Surface water is rain that falls faster than drains and the ground can take it. It is mapped separately from rivers and the sea, and it is not in the Hazard risk Grade.
About 0.5% of homes are at high risk of surface-water flooding (a 1 in 30 chance or more each year) and 1.9% at medium risk: roughly 210 households. A further 9.2% face a low risk from surface water. That is more than 31% of UK towns.
Our estimate: every address in the town (ONS NSUL) read on the Environment Agency’s Risk of Flooding from Surface Water map (NaFRA2, 2025), each postcode’s share weighted by its Census 2021 households. Neither agency publishes a count of homes for surface water, so treat it as a guide; one street can differ from the next.
Selby has flooded in 8 recorded years since 1947, most of all in 1947
Every flood the Environment Agency has mapped inside Selby’s built-up area, newest first. The record is fullest for big river floods; small and surface-water floods are often missing.
- 2021January 2021: River flooding recorded5 hectares inside today’s built-up area · January Flood Incident - Storm Christoph
- 2020February 2020: River flooding recorded2 hectares inside today’s built-up area · February Flood Incident - Storm Dennis, February Flood Incident - Storm Ciara
- 2015December 2015: River flooding recorded2 hectares inside today’s built-up area
- 2007June 2007: River flooding recorded7 hectares inside today’s built-up area
- 2000October 2000: River flooding recorded49 hectares inside today’s built-up area
- 1995January 1995: River flooding recorded3 hectares inside today’s built-up area
Show all 8
- 1978December 1978: River flooding recorded19 hectares inside today’s built-up area
- 1947March 1947: River flooding recorded372 hectares inside today’s built-up area
Floodwater covered 372 hectares of what is now Selby in 1947, the largest flood the record holds here (March).
7,198 of Selby’s households today live inside the outline of a recorded flood.
Since 1947, the largest recorded flood inside the town covered 49 hectares.
The River Ouse at Selby Westmill: highest 6.34 m, in December 2015
The highest level each winter (October to September) at the Environment Agency’s Selby Westmill gauge, since 2002. The river normally runs between 0.36 m and 5.00 m here.
- 28 December 20156.34 m
- 1 October 20196.17 m
- 31 March 20066.14 m
- 24 January 20086.08 m
- 12 February 20205.93 m
- 25 February 20205.89 m
The River Ouse has topped its normal range on 422 days since 2002, most in the winters of 2015–16 and 2023–24. By its highest day, the winter of 2025–26 was the 19th-highest of the 22.
Environment Agency Hydrology API, Selby Westmill (station L2401A), daily maximum level; the record and normal range from the EA’s stage scale. Live river levels are on GOV.UK’s Check for flooding.
No flood warning or alert is in force for Selby · 2 warnings in 20 years
The Environment Agency has 2 flood warning areas and 2 alert areas reaching into the town; warnings since the service began in 2006.
The warning area covering the most of Selby, River Ouse at Selby and Barlby, has not had a flood warning since 2006. Of the 2 warnings, 2 were for River Ouse at Selby Dam.
2019 had the most warnings (1); 2012 the most alerts (22). The most recent warning was on 21 January 2021.
Show the 4 warning and alert areas
| Area | Kind | Since 2006 | Now |
|---|---|---|---|
| River Ouse at Selby Dam | Warning area | 2 | None |
| River Ouse at Selby and Barlby | Warning area | 0 | None |
| Tidal River Ouse from Naburn Lock to Selby | Alert area | 136 | None |
| Lower River Aire catchment | Alert area | 31 | None |
Environment Agency Historic Flood Warnings (first issues only, not updates; “flood watch” counted as an alert before 2011) and the real-time flood-monitoring API. Sign up for free warnings on GOV.UK or call Floodline, 0345 988 1188.
Selby is in the lowest radon band
Radon is a natural radioactive gas from the ground; long exposure raises the risk of lung cancer. The atlas gives the chance that a home in each 1 km square is above the UK action level (200 Bq/m³).
Every 1 km square over Selby is in the lowest band: fewer than 1 in 100 homes are expected to be above the action level.
BGS/UKHSA Indicative Atlas of Radon in Great Britain, version 3. Check an address at UKradon.org.
Flood risk in the places around Selby
Share of homes at high or medium and at low risk from rivers and the sea. Tap a town for its page.
| Town | People | High or medium | Low | Hazard |
|---|---|---|---|---|
| Selby | 19,480 | 12% | 80% | D− |
| Brayton | 4,092 | 0.1% | 40% | B− |
| Barlby | 3,499 | 14% | 0.7% | D− |
| Thorpe Willoughby | 3,482 | 0% | 1% | B+ |
| Riccall | 2,388 | 20% | 15% | D− |
| Hambleton | 1,722 | 0% | 29% | B |
| Hemingbrough | 1,874 | 22% | 4% | D− |
| Cawood | 1,501 | 58% | 30% | D− |
Cawood, 4.3 miles north-west, has the most homes at risk around Selby (58% at high or medium). Thorpe Willoughby and Hambleton have none.
Get ready for what Selby faces
Free warnings, what to do in a cloudburst, and what to check before you move.
- Sign up free for Environment Agency flood warnings by text, call or email.
- Floodline: 0345 988 1188, 24 hours.
- Selby’s warning areas include River Ouse at Selby and Barlby and River Ouse at Selby Dam.
- Surface water rises in minutes, often with no warning issued: stay out of underpasses and dips.
- Keep the gullies and drains outside your home clear of leaves.
- Report a blocked road drain to the council.
- Never walk or drive through floodwater: 30 cm of moving water can float a car.
- Move valuables, papers and medicines upstairs.
- Turn off gas, electricity and water if you’re told to.
- Check the address on GOV.UK’s long-term flood risk service: it gives rivers and sea and surface water separately.
- Ask whether the home has flooded or had a flood insurance claim; the TA6 property form asks the seller.
- Homes built before 2009 can get flood cover through Flood Re, the government-backed scheme; newer homes can’t.
What this data can and can’t tell you
- Defences are counted. Both agencies’ maps allow for flood defences and the chance they are overtopped or fail, so a town behind a defence scheme can show few homes at high risk and many at low risk.
- Surface water is our estimate. Neither agency publishes a count of homes at risk from surface water, so we read each address on the map. A flat on a hill and a basement in a dip can share a postcode.
- Past floods are what was recorded. The flood outlines come from surveys, aerial photographs and reports; many small floods, and most surface-water floods, were never mapped.
- One town, many streets. Risk is street by street. Check a specific address on GOV.UK’s long-term flood risk service before you buy or rent.
Questions about flooding and hazards in Selby
Does Selby flood?
The last flood the Environment Agency recorded inside the town was in January 2021. 12% of homes are at high or medium risk from rivers and the sea on the Environment Agency’s maps, which allow for flood defences. About 2.3% of homes are at high or medium risk from surface water, when heavy rain overwhelms the drains. Selby grades D− for hazard risk against UK towns.
Which parts of Selby are at risk of flooding?
From rivers and the sea, the places the Environment Agency warns directly: River Ouse at Selby Dam and River Ouse at Selby and Barlby. Surface water can collect in low spots anywhere in the town. Check a specific address on GOV.UK’s long-term flood risk service.
When did Selby last flood?
The recorded flood outlines inside the town run from 1947 to 2021 (8 years); the largest was in 1947. Flood warnings have been issued for parts of the town since 2006, most recently on 21 January 2021.
Is Selby at risk of surface water flooding?
About 0.5% of homes are at high risk and 1.9% at medium risk from surface water, against 12% at high or medium risk from rivers and the sea. Surface water floods come with little warning, and the agencies don’t issue warnings for them.
Is radon a problem in Selby?
Not by the atlas: every 1 km square over Selby is in the lowest band, where fewer than 1 in 100 homes are expected to be above the action level.
Are there flood warnings in Selby now?
No flood warning or alert was in force near Selby at 7 November 2026, 18:45. Live warnings are on GOV.UK’s Check for flooding service and Floodline, 0345 988 1188.
Contains Environment Agency information © Environment Agency and/or database right 2026. Contains British Geological Survey materials © UKRI 2026.
Sources: Environment Agency Risk of Flooding from Rivers and Sea, postcodes in areas at risk (June 2026); Natural Resources Wales Flood Risk Assessment Wales (May 2026); ONS Census 2021 households by postcode · Environment Agency Risk of Flooding from Surface Water (NaFRA2, 2025) and Natural Resources Wales Flood Risk Assessment Wales surface water and small watercourses, read at every address (ONS National Statistics UPRN Lookup, September 2026) and weighted by Census 2021 households by postcode · Environment Agency Recorded Flood Outlines and Natural Resources Wales historic flood map, inside the ONS 2022 built-up-area boundary · Environment Agency Hydrology API (daily maximum river level) and flood-monitoring stage scales · Environment Agency real-time flood-monitoring API · Environment Agency Historic Flood Warnings (January 2006 to June 2026) and flood warning and alert areas · BGS/UKHSA Indicative Atlas of Radon in Great Britain, version 3, by 1 km square · TownRatings grades: our own summary of the data, ranked against UK towns only. All under the Open Government Licence v3.0.
Contains public sector information licensed under the Open Government Licence v3.0. Contains HM Land Registry data © Crown copyright and database right 2026. Contains OS data © Crown copyright and database right 2026 (ONS boundaries). Northern Ireland: Source: NISRA; contains Land & Property Services data and Ordnance Survey of Northern Ireland information, © Crown copyright, licensed under the Open Government Licence v3.0. Scotland: contains National Records of Scotland data, Registers of Scotland data and SEPA data, © Crown copyright / © SEPA 2025, licensed under the Open Government Licence v3.0.