Photo: Malc McDonald · CC BY-SA 2.0Surface water, more than the river, is Enfield’s flood risk: 7.5% of homes, against 1.3% from rivers or the sea
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. For hazard risk, Enfield grades C: #20 of 33 in London.
What stands out about Enfield’s hazards
From the Environment Agency’s maps and records and the BGS radon atlas, below.
What Enfield 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 Pymmes Brook
Flood warnings
Radon
Enfield grades C 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 Enfield
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 Salmons Brook, the Ching Brook and the Cobbins Brook. Surface-water risk is spread across the borough, in dips, underpasses and along small streams, which is why more homes are exposed to it.
1.3% of Enfield’s homes are at high or medium risk from rivers or the sea
The Environment Agency’s national map, allowing for defences. A further 6.8% 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; Enfield has more than 72% of towns.
| # | Town | People | High or med. | |
|---|---|---|---|---|
| 1 | Southwark London | 307,076 | 0% | |
| 2 | Newham London | 351,065 | under 0.1% | |
| 3 | Wolverhampton West Midlands | 234,029 | under 0.1% | |
| … | ||||
| 20 | Cardiff South Glamorgan | 348,511 | 0.9% | |
| 21 | Barnet London | 388,572 | 1.2% | |
| 22 | Enfield London | 329,822 | 1.3% | |
| 23 | Hillingdon London | 307,089 | 1.3% | |
| 24 | Harrow London | 260,534 | 1.3% | |
| … | ||||
| 37 | Nottingham Nottinghamshire | 299,786 | 3.6% | |
| 38 | Kingston upon Hull East Riding of Yorkshire | 270,816 | 6.3% | |
UK towns of 231,000 to 462,000 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.
Heavy rain puts about 5.9 times as many Enfield homes at risk as rivers and the sea do
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 3.3% of homes are at high risk of surface-water flooding (a 1 in 30 chance or more each year) and 4.2% at medium risk: roughly 9,130 households. A further 12% face a low risk from surface water. That is more than 85% of UK towns.
Our estimate: every address in the borough (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.
Enfield has flooded in 11 recorded years since 1947, most of all in 1947
Every flood the Environment Agency has mapped inside Enfield’s built-up area, newest first. The record is fullest for big river floods; small and surface-water floods are often missing.
- 2022August 2022: River flooding recordedUnder 1 hectare inside today’s built-up area
- 2021January 2021: River flooding recordedUnder 1 hectare inside today’s built-up area
- 2012June 2012: River flooding recordedUnder 1 hectare inside today’s built-up area
- 2006November 2006: River flooding recorded1 hectare inside today’s built-up area
- 2000January and October 2000: River flooding recorded27 hectares inside today’s built-up area
- 1987January 1987: River flooding recorded2 hectares inside today’s built-up area
Show all 11
- 1981January 1981: River flooding recordedUnder 1 hectare inside today’s built-up area
- 1980January 1980: River flooding recordedUnder 1 hectare inside today’s built-up area
- 1977January 1977: River flooding recorded1 hectare inside today’s built-up area
- 1964December 1964: River flooding recorded2 hectares inside today’s built-up area
- 1947January 1947: River flooding recorded183 hectares inside today’s built-up area
Floodwater covered 183 hectares of what is now Enfield in 1947, the largest flood the record holds here (January).
3,273 of Enfield’s households today live inside the outline of a recorded flood.
Since 1947, the largest recorded flood inside the borough covered 27 hectares.
The Pymmes Brook at Edmonton, Silver Street: highest 1.45 m, in October 1993
The highest level each winter (October to September) at the Environment Agency’s Edmonton, Silver Street gauge (Edmonton), since 1990. The river normally runs between 0.04 m and 1.70 m here.
- 12 October 19931.45 m
- 10 August 19941.36 m
- 9 September 20021.34 m
- 20 July 19921.31 m
- 20 September 20231.27 m
- 30 October 20001.27 m
The Pymmes Brook has topped its normal range on 0 days since 1990. By its highest day, the winter of 2025–26 was the 14th-highest of the 35.
Environment Agency Hydrology API, Edmonton, Silver Street (station 5369TH), 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 Enfield · 1 warning in 20 years
The Environment Agency has 7 flood warning areas and 2 alert areas reaching into the borough; warnings since the service began in 2006.
The warning area covering the most of Enfield, Lower River Lee at Enfield, has not had a flood warning since 2006. Of the 1 warnings, 1 were for Small River Lee at Cheshunt.
2016 had the most warnings (1); 2024 the most alerts (15). The most recent warning was on 16 September 2016.
Show the 9 warning and alert areas
| Area | Kind | Since 2006 | Now |
|---|---|---|---|
| Small River Lee at Cheshunt | Warning area | 1 | None |
| Salmons Brook at Grange Park and Lower Edmonton | Warning area | 0 | None |
| Lower River Lee at Enfield | Warning area | 0 | None |
| Turkey Brook at Enfield | Warning area | 0 | None |
| Pymmes Brook at Upper Edmonton and Tottenham | Warning area | 0 | None |
| Pymmes Brook at East Barnet | Warning area | 0 | None |
| Pymmes Brook from Bowes Park to Edmonton | Warning area | 0 | None |
| Lower Lee tributaries | Alert area | 115 | None |
| Lower River Lee from Hoddesdon to Canning Town | Alert area | 17 | 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.
Enfield 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 Enfield 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 Enfield
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 |
|---|---|---|---|---|
| Enfield | 329,822 | 1.3% | 6.8% | C |
| Haringey | 264,069 | 0.8% | 2.9% | C |
| Waltham Cross | 11,936 | 1.7% | 30% | C− |
| Waltham Forest | 278,129 | 1.6% | 3% | C− |
| Cheshunt | 43,694 | 1.8% | 6.3% | C− |
| Goff's Oak | 3,503 | under 0.1% | under 0.1% | B |
| Waltham Abbey | 18,645 | 1.2% | 4.8% | C |
| Cuffley | 4,350 | 0% | 0% | A |
Cheshunt, 4.9 miles north, has the most homes at risk around Enfield (1.8% at high or medium). Cuffley has none.
Get ready for what Enfield 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.
- Enfield’s warning areas include Lower River Lee at Enfield and Salmons Brook at Grange Park and Lower Edmonton.
- 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 Enfield
Does Enfield flood?
The last flood the Environment Agency recorded inside the borough was in August 2022. 1.3% 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 7.5% of homes are at high or medium risk from surface water, when heavy rain overwhelms the drains. Enfield grades C for hazard risk against UK towns.
Which parts of Enfield are at risk of flooding?
From rivers and the sea, the places the Environment Agency warns directly: Small River Lee at Cheshunt, Lower River Lee at Enfield, Salmons Brook at Grange Park and Lower Edmonton and Pymmes Brook from Bowes Park to Edmonton. Surface water can collect in low spots anywhere in the borough. Check a specific address on GOV.UK’s long-term flood risk service.
When did Enfield last flood?
The recorded flood outlines inside the borough run from 1947 to 2022 (11 years); the largest was in 1947. Flood warnings have been issued for parts of the borough since 2006, most recently on 16 September 2016.
Is Enfield at risk of surface water flooding?
About 3.3% of homes are at high risk and 4.2% at medium risk from surface water, against 1.3% 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 Enfield?
Not by the atlas: every 1 km square over Enfield 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 Enfield now?
No flood warning or alert was in force near Enfield at 7 November 2026, 02:52. 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.