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AHazard risk Grade
Flood & hazards in Forest Town · Environment Agency

Rivers and the sea put none of Forest Town’s homes at high or medium risk; surface water puts 1.4% at risk

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. Forest Town grades A for hazard risk: #1 of 49 in Nottinghamshire.

0warnings in force0%at low risk
In brief

What stands out about Forest Town’s hazards

From the Environment Agency’s maps and records and the BGS radon atlas, below.

Rain, not the river1.4% of homes sit where heavy rain can flood the streets; none are at risk from rivers or the sea.The River Maun ran its 6th-highest in August 20261.52 m at Mansfield The Dykes on 30 August 2026, 12 cm under the record set in 1993.
By hazard

What Forest Town faces

Each hazard against its own yardstick; meters run from low to high on that yardstick.

Rivers and the sea

0%of homes at high or medium risk
None at high or medium risk
0 homes by the EA’s own count

Surface water

1.4%of homes at high or medium risk
More than 15% of UK towns
About 110 households

The River Maun

1.52 mhighest in winter 2025–26 at Mansfield The Dykes
6th-highest of 34 winters
Record 1.63 m, June 1993

Radon

1%of the town in a radon Affected Area
Highest band here: 3–5% of homes
No square of 5% or more
Not on this page: coastal erosion, subsidence and shrink-swell ground (the British Geological Survey licenses it), groundwater flooding and reservoir failure.
Hazard risk Grade

Forest Town grades A for hazard risk

Flood risk from rivers and the sea, against all UK towns.

Homes at high or medium flood risk (0%)Fewer than 86% of 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.

Flood map

Where the water goes in Forest Town

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.

© OpenStreetMap contributors · EA NaFRA2
HighMediumLowrivers & seaHighMediumLowsurface waterForest Town’s built-up area

No home in Forest Town is in the high or medium band for rivers or the sea. Surface-water risk is spread across the town, in dips, underpasses and along small streams, which is why more homes are exposed to it.

Rivers and the sea

0% of Forest Town’s homes are at high or medium risk from rivers or the sea

The Environment Agency’s national map, allowing for defences. None are in the low-risk band.

High risk0%of homes · 1 in 30 a year or more0 homes, EA count
Medium risk0%of homes · 1 in 30 to 1 in 1000 homes, EA count
Low risk0%of homes · 1 in 100 to 1 in 1,0000 homes, EA count
Where Forest Town sits among 3,735 UK towns
35%NoneForest Town
23%Under 0.5%
9%0.5–1%
11%1–2%
11%2–5%
5%5–10%
3%10–20%
2%20% +

Share of each UK town’s homes at high or medium risk from rivers and the sea. 35% of UK towns have none.

Towns its size: 24th of 351 from the fewest homes at risk
#TownPeopleHigh or med.
1Little Hulton Greater Manchester25,8240%
2Coseley West Midlands25,2060%
3Wickersley and Bramley South Yorkshire24,6530%
…
22Stanley County Durham19,4230%
23Leek Staffordshire19,3880%
24Forest Town Nottinghamshire19,0150%
25Litherland Merseyside18,7520%
26Clifton Greater Manchester17,7480%
…
350Dunscroft and Hatfield South Yorkshire14,00051%
351Goole East Riding of Yorkshire20,17394%

UK towns of 13,000 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.

Surface water

1.4% of Forest Town’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.

Surface water1.4%
Rivers and the sea0%
0%7%14% of homes

About 0.6% of homes are at high risk of surface-water flooding (a 1 in 30 chance or more each year) and 0.8% at medium risk: roughly 110 households. A further 3.9% face a low risk from surface water. That is more than 15% of UK towns.

~110
households at high or medium risk
3.9%
of homes at low risk
15%
of UK towns have a smaller share
9,454
addresses read on the map

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.

River levels

The River Maun at Mansfield The Dykes: highest 1.63 m, in June 1993

The highest level each winter (October to September) at the Environment Agency’s Mansfield The Dykes gauge (Mansfield), since 1992. The river normally runs between 0.25 m and 1.00 m here.

Highest level each winter, metres
Winter 1992–93: highest 1.63 m on 11 June 1993 · 3 days above the normal rangeWinter 1993–94: highest 1.10 m · 2 days above the normal rangeWinter 1994–95: highest 0.98 m · 0 days above the normal rangeWinter 1995–96: highest 0.94 m · 0 days above the normal rangeWinter 1996–97: highest 1.33 m · 1 days above the normal rangeWinter 1997–98: highest 1.19 m · 2 days above the normal rangeWinter 1998–99: highest 1.31 m · 1 days above the normal rangeWinter 1999–00: highest 1.10 m · 1 days above the normal rangeWinter 2000–01: highest 1.10 m · 3 days above the normal rangeWinter 2001–02: highest 1.45 m on 30 July 2002 · 2 days above the normal rangeWinter 2002–03: highest 0.93 m · 0 days above the normal rangeWinter 2003–04: highest 1.46 m on 10 August 2004 · 3 days above the normal rangeWinter 2004–05: highest 1.10 m · 1 days above the normal rangeWinter 2005–06: highest 1.09 m · 4 days above the normal rangeWinter 2006–07: highest 1.19 m · 4 days above the normal rangeWinter 2007–08: highest 1.16 m · 2 days above the normal rangeWinter 2008–09: highest 1.07 m · 1 days above the normal rangeWinter 2009–10: highest 1.53 m on 6 June 2010 · 4 days above the normal rangeWinter 2010–11: highest 1.14 m · 1 days above the normal rangeWinter 2011–12: highest 1.26 m · 3 days above the normal rangeWinter 2012–13: highest 1.28 m · 3 days above the normal rangeWinter 2013–14: highest 1.55 m on 8 August 2014 · 7 days above the normal rangeWinter 2014–15: highest 1.24 m · 1 days above the normal rangeWinter 2015–16: highest 1.40 m · 2 days above the normal rangeWinter 2016–17: highest 1.36 m · 2 days above the normal rangeWinter 2017–18: highest 1.26 m · 3 days above the normal rangeWinter 2018–19: highest 1.04 m · 2 days above the normal rangeWinter 2019–20: highest 1.35 m · 5 days above the normal rangeWinter 2020–21: highest 1.11 m · 2 days above the normal rangeWinter 2021–22: highest 1.12 m · 2 days above the normal rangeWinter 2022–23: highest 1.55 m on 18 September 2023 · 6 days above the normal rangeWinter 2023–24: highest 1.55 m on 20 October 2023 · 4 days above the normal rangeWinter 2024–25: highest 1.04 m · 1 days above the normal rangeWinter 2025–26: highest 1.52 m on 30 August 2026 · 3 days above the normal range’92–93’22–23’13–14Record 1.63 m, 1993Top of normal range
1992–932025–26
The highest days on record
  • 11 June 19931.63 m
  • 18 September 20231.55 m
  • 8 August 20141.55 m
  • 20 October 20231.55 m
  • 6 June 20101.53 m
  • 30 August 20261.52 m

The River Maun has topped its normal range on 81 days since 1992, most in the winters of 2013–14 and 2022–23. By its highest day, the winter of 2025–26 was the 6th-highest of the 34.

Environment Agency Hydrology API, Mansfield The Dykes (station 4115), 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.

Flood warnings

No flood warning or alert is in force for Forest Town

Now: no flood warnings or alerts for Forest Town (checked 8 November 2026, 15:47). Check for flooding on GOV.UK →

The Environment Agency has no flood warning or alert area that reaches into Forest Town’s built-up area.

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.

Radon

Parts of Forest Town are in radon Affected Areas, at the low end

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).

SK5461: 3–5% of homes above the action levelSK5462: 3–5% of homes above the action levelSK5561: Under 1% of homes above the action levelSK5562: Under 1% of homes above the action levelSK5563: Under 1% of homes above the action levelSK5661: Under 1% of homes above the action levelSK5662: Under 1% of homes above the action levelSK5761: Under 1% of homes above the action levelSK5762: Under 1% of homes above the action levelSK5763: Under 1% of homes above the action levelSK5862: Under 1% of homes above the action levelSK5863: Under 1% of homes above the action levelSK5864: Under 1% of homes above the action levelSK5962: Under 1% of homes above the action levelSK5963: Under 1% of homes above the action levelSK5964: Under 1% of homes above the action levelSK6063: Under 1% of homes above the action level© OpenStreetMap contributors · BGS/UKHSA
Under 1%3–5%
Share of the town’s area in each band
Under 1% of homes99%
3–5% of homes1%

1% of Forest Town’s built-up area is in a radon Affected Area (1% of homes or more above the action level).

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.

Neighbours

Flood risk in the places around Forest Town

Share of homes at high or medium and at low risk from rivers and the sea. Tap a town for its page.

Mansfield Woodhouse: Hazard risk AMansfield: Hazard risk B−Market Warsop: Hazard risk ARainworth: Hazard risk B−Church Warsop: Hazard risk B−Edwinstowe: Hazard risk B−Meden Vale: Hazard risk AMansfield WoodhouseMansfieldMarket WarsopRainworthChurch WarsopEdwinstoweMeden ValeForest Town
ABCD
TownPeopleHigh or mediumLowHazard
Forest Town19,0150%0%A
Mansfield Woodhouse19,5210%0%A
Mansfield63,4480.2%0.2%B−
Market Warsop6,9700%0%A
Rainworth7,9900.3%under 0.1%B−
Church Warsop2,1390.2%0%B−
Edwinstowe5,3270.2%0%B−
Meden Vale2,0950%0%A

Mansfield Woodhouse, Market Warsop and Meden Vale have none.

Be ready

Get ready for what Forest Town faces

Free warnings, what to do in a cloudburst, and what to check before you move.

Get the warnings
  • Sign up free for Environment Agency flood warnings by text, call or email.
  • Floodline: 0345 988 1188, 24 hours.
Sign up ↗
In a cloudburst
  • 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.
Radon
  • 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%.
UKradon ↗
Before you buy or rent in Forest Town
  • 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.
How to read these numbers

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.
  • 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.

Check the long-term flood risk for an address on GOV.UK →

Questions about flooding and hazards in Forest Town

Does Forest Town flood?

0% 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 1.4% of homes are at high or medium risk from surface water, when heavy rain overwhelms the drains. Forest Town grades A for hazard risk against UK towns.

Is Forest Town at risk of surface water flooding?

About 0.6% of homes are at high risk and 0.8% at medium risk from surface water, against 0% 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 Forest Town?

1% of the town’s built-up area is in a radon Affected Area on the BGS/UKHSA atlas. Most homes are below it; a three-month test is the only way to know.

Are there flood warnings in Forest Town now?

No flood warning or alert was in force near Forest Town at 8 November 2026, 15:47. 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 Hydrology API (daily maximum river level) and flood-monitoring stage scales · Environment Agency real-time flood-monitoring API · 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.