Photo: Malcolm Neal · CC BY-SA 2.0In Nottingham, 3.6% of homes face high or medium risk from rivers or the sea and 4.2% from surface water
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 Nottingham at D: #46 of 49 in Nottinghamshire.
What stands out about Nottingham’s hazards
From the Environment Agency’s maps and records and the BGS radon atlas, below.
What Nottingham 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 Leen
Flood warnings
Radon
Nottingham 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 Nottingham
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 Trent, the River Leen and the Day Brook. Surface-water risk is spread across the city, in dips, underpasses and along small streams, which is why more homes are exposed to it.
3.6% of Nottingham’s homes are at high or medium risk from rivers or the sea
The Environment Agency’s national map, allowing for defences. A further 3.7% 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; Nottingham has more than 86% of towns.
| # | Town | People | High or med. | |
|---|---|---|---|---|
| 1 | Southwark London | 307,076 | 0% | |
| 2 | Islington London | 216,309 | 0% | |
| 3 | Newham London | 351,065 | under 0.1% | |
| … | ||||
| 38 | Portsmouth Hampshire | 223,324 | 2.6% | |
| 39 | Lewisham London | 300,764 | 3.6% | |
| 40 | Nottingham Nottinghamshire | 299,786 | 3.6% | |
| 41 | Kingston upon Hull East Riding of Yorkshire | 270,816 | 6.3% | |
UK towns of 210,000 to 420,000 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.
4.2% of Nottingham’s homes are at high or medium risk from surface water
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 2.2% of homes are at high risk of surface-water flooding (a 1 in 30 chance or more each year) and 2% at medium risk: roughly 4,930 households. A further 5.4% face a low risk from surface water. That is more than 60% of UK towns.
Our estimate: every address in the city (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.
Nottingham has flooded in 12 recorded years since 1900, most of all in 1947
Every flood the Environment Agency has mapped inside Nottingham’s built-up area, newest first. The record is fullest for big river floods; small and surface-water floods are often missing.
- 2024January 2024: The Day Brook overflowed11 hectares inside today’s built-up area · Beeston to West Bridgford, Day Brook
- 2023October 2023: River flooding recorded2 hectares inside today’s built-up area
- 2010June 2010: The Day Brook overflowed9 hectares inside today’s built-up area · Day Brook
- 2000October and November 2000: River flooding recorded13 hectares inside today’s built-up area · Fluvial Trent
- 1998January 1998: River flooding recorded2 hectares inside today’s built-up area
- 1979January 1979: River flooding recorded113 hectares inside today’s built-up area
Show all 12
- 1977February 1977: River flooding recorded10 hectares inside today’s built-up area · Fluvial Trent
- 1960December 1960: River flooding recorded56 hectares inside today’s built-up area
- 1947March 1947: The River Leen overflowed637 hectares inside today’s built-up area · Fluvial Trent
- 1946February 1946: River flooding recorded334 hectares inside today’s built-up area
- 1932January and May 1932: River flooding recorded444 hectares inside today’s built-up area · Trent Shardlow & Notts, Trent Nottingham & West Bridgford
- 1900January 1900: River flooding recorded105 hectares inside today’s built-up area
The River Leen covered 637 hectares of what is now Nottingham in 1947, the largest flood the record holds here (March).
6,527 of Nottingham’s households today live inside the outline of a recorded flood.
Since 1947, the largest recorded flood inside the city covered 113 hectares.
The River Leen at Lenton: highest 1.62 m, in October 1979
The highest level each winter (October to September) at the Environment Agency’s Lenton gauge (Lenton), since 2003. The river normally runs between 0.08 m and 1.00 m here.
- 10 August 20141.16 m
- 16 February 20201.15 m
- 26 July 20071.14 m
- 18 September 20231.12 m
- 23 July 20131.11 m
- 20 October 20231.09 m
The River Leen has topped its normal range on 16 days since 2003, most in the winters of 2006–07 and 2023–24. By its highest day, the winter of 2025–26 was the 17th-highest of the 23.
Environment Agency Hydrology API, Lenton (station 4435), 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 Nottingham · 47 warnings in 20 years
The Environment Agency has 13 flood warning areas and 2 alert areas reaching into the city; warnings since the service began in 2006.
The warning area covering the most of Nottingham, Rivers Leen and Trent at Dunkirk, has not had a flood warning since 2006. Of the 47 warnings, 15 were for River Trent at Lenton for Nottingham Park and Ride Site at Queens Drive and 14 for Day Brook at Ventnor Rise and Athorpe Grove in Old Basford.
2019 had the most warnings (8). The most recent warning was on 8 February 2026.
Show the 15 warning and alert areas
| Area | Kind | Since 2006 | Now |
|---|---|---|---|
| River Trent at Lenton for Nottingham Park and Ride Site at Queens Drive | Warning area | 15 | None |
| Day Brook at Ventnor Rise and Athorpe Grove in Old Basford | Warning area | 14 | None |
| Rivers Leen at Old Basford, New Basford and Bobbers Mill | Warning area | 9 | None |
| River Leen at Bulwell | Warning area | 8 | None |
| Day Brook at Old Basford | Warning area | 1 | None |
| Rivers Leen and Trent at Dunkirk | Warning area | 0 | None |
| River Trent at Beeston Rylands | Warning area | 0 | None |
| River Trent at Nottingham including The Meadows | Warning area | 0 | None |
| River Leen at Radford | Warning area | 0 | None |
| River Trent at Colwick Racecourse | Warning area | 0 | None |
| Rivers Leen and Trent at Old Lenton and Castle Marina | Warning area | 0 | None |
| Tottle Brook at Wollaton and Beeston | Warning area | 0 | None |
| Upper Day Brook at Sherwood and Woodthorpe | Warning area | 0 | None |
| River Leen, Day Brook and Tottle Brook in Nottinghamshire | Alert area | 172 | None |
| River Trent in Nottinghamshire | Alert area | 71 | 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.
Parts of Nottingham are in radon Affected Areas, up to the Over 30% 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).
49% of Nottingham’s built-up area is in a radon Affected Area (1% of homes or more above the action level), and 18% in squares of 5% or more, mostly on the north-west side of the city.
The squares are indicative: each takes the highest band found anywhere inside it, so most homes in a coloured square are below it. Only a three-month test in the home gives a real answer.
BGS/UKHSA Indicative Atlas of Radon in Great Britain, version 3. Check an address at UKradon.org.
Flood risk in the places around Nottingham
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 |
|---|---|---|---|---|
| Nottingham | 299,786 | 3.6% | 3.7% | D |
| Arnold | 40,016 | under 0.1% | under 0.1% | B |
| Nuthall and Watnall | 9,581 | 0% | 0% | A |
| Wilford | 4,849 | 48% | 36% | D− |
| Carlton | 53,555 | 4.1% | 7% | D |
| Bestwood Village | 2,151 | 0.1% | 6.1% | B |
| West Bridgford | 36,489 | 1.3% | 39% | C |
| Gamston (Rushcliffe) | 2,171 | 0% | 0.4% | B+ |
Wilford, 3.4 miles south, has the most homes at risk around Nottingham (48% at high or medium). Nuthall and Watnall and Gamston (Rushcliffe) have none.
Get ready for what Nottingham 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.
- Nottingham’s warning areas include Rivers Leen and Trent at Dunkirk and River Trent at Nottingham including The Meadows.
- 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.
- Test over three months, in a living room and a bedroom.
- Above 200 Bq/m³, a small sump and fan usually fixes it.
- New homes in radon areas are built with protection: basic from 3%, full from 10%.
- 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.
- Check radon for the address on UKradon.org (a small fee) or ask the seller for a test result.
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 Nottingham
Does Nottingham flood?
The last flood the Environment Agency recorded inside the city was in January 2024. 3.6% 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 4.2% of homes are at high or medium risk from surface water, when heavy rain overwhelms the drains. Nottingham grades D for hazard risk against UK towns.
Which parts of Nottingham are at risk of flooding?
From rivers and the sea, the places the Environment Agency warns directly: River Trent at Lenton for Nottingham Park and Ride Site at Queens Drive, Day Brook at Ventnor Rise and Athorpe Grove in Old Basford, Rivers Leen at Old Basford, New Basford and Bobbers Mill and River Leen at Bulwell. Surface water can collect in low spots anywhere in the city. Check a specific address on GOV.UK’s long-term flood risk service.
When did Nottingham last flood?
The recorded flood outlines inside the city run from 1900 to 2024 (12 years); the largest was in 1947. Flood warnings have been issued for parts of the city since 2006, most recently on 8 February 2026.
Is Nottingham at risk of surface water flooding?
About 2.2% of homes are at high risk and 2% at medium risk from surface water, against 3.6% 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 Nottingham?
49% of the city’s built-up area is in a radon Affected Area on the BGS/UKHSA atlas, and 18% is in 1 km squares where 5% or more of homes may be above the action level. Most homes are below it; a three-month test is the only way to know.
Are there flood warnings in Nottingham now?
No flood warning or alert was in force near Nottingham at 7 November 2026, 15:17. 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.