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Street , High StreetPhoto: Lewis Clarke · CC BY-SA 2.0
BHazard risk Grade
Flood & hazards in Street · Environment Agency

Surface water, more than the river, is Street’s flood risk: 2.8% of homes, against under 0.1% 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. Hazard risk puts Street at B: #10 of 49 in Somerset.

2012worst recorded flood5flood warnings since 2006100%in a radon Affected Area
In brief

What stands out about Street’s hazards

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

Rain, more than the river2.8% of homes sit where heavy rain can flood the streets, against under 0.1% at risk from rivers and the sea.Remembers 2012Floodwater covered 2 hectares of today’s Street in 2012.5 flood warnings since 2006For the parts of Street the Environment Agency warns directly; the most recent on 26 January 2025.Radon in parts100% of the town is in 1 km squares where 5% or more of homes may be above the radon action level.
By hazard

What Street faces

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

Rivers and the sea

under 0.1%of homes at high or medium risk
Fewer than the typical UK town · more than 42% of towns
5 homes by the EA’s own count

Surface water

2.8%of homes at high or medium risk
More than 39% of UK towns
Rivers and sea: under 0.1%

Past floods

6years with a recorded flood
Last recorded: January 2014
14 households inside past outlines

The River Brue

0.97 mhighest in winter 2025–26 at Clyse Hole
22nd-highest of 26 winters
Record 1.20 m, January 2004

Flood warnings

5flood warnings since 2006
187 flood alerts for the wider area
Last warning 26 January 2025

Radon

100%of the town in a radon Affected Area
Highest band here: 10–30% of homes
100% in squares 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

Street grades B for hazard risk

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

Homes at high or medium flood risk (under 0.1%)Fewer than 58% 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 Street

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.

Recorded flood: 1955Recorded flood: 1960Recorded flood: 2008Recorded flood: 2009Recorded flood: 2012Recorded flood: 2014© OpenStreetMap contributors · EA NaFRA2
HighMediumLowrivers & seaHighMediumLowsurface waterStreet’s built-up area

The river and sea risk follows the River Brue, the River Sheppey and the North Drain. 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

Under 0.1% of Street’s homes are at high or medium risk from rivers or the sea

The Environment Agency’s national map, allowing for defences. A further 0.4% are at low risk.

High riskunder 0.1%of homes · 1 in 30 a year or more2 homes, EA count
Medium riskunder 0.1%of homes · 1 in 30 to 1 in 1003 homes, EA count
Low risk0.4%of homes · 1 in 100 to 1 in 1,00019 homes, EA count
Where Street sits among 3,735 UK towns
35%None
23%Under 0.5%Street
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; Street has more than 42% of towns.

Towns its size: 141st of 406 from the fewest homes at risk
#TownPeopleHigh or med.
1Clifton Greater Manchester17,7480%
2Oswestry Shropshire17,5000%
3Royston Hertfordshire17,4430%
…
139New Mills Derbyshire9,195under 0.1%
140North Walsham Norfolk12,829under 0.1%
141Street Somerset12,707under 0.1%
142Great Harwood Lancashire11,022under 0.1%
143Great Wyrley and Cheslyn Hay Staffordshire17,6470.1%
…
405Bentley South Yorkshire12,04440%
406Dunscroft and Hatfield South Yorkshire14,00051%

UK towns of 9,000 to 18,000 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

2.8% of Street’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 water2.8%
Rivers and the seaunder 0.1%
0%7%14% of homes

About 1.2% of homes are at high risk of surface-water flooding (a 1 in 30 chance or more each year) and 1.6% at medium risk: roughly 150 households. A further 6.5% face a low risk from surface water. That is more than 39% of UK towns.

~150
households at high or medium risk
6.5%
of homes at low risk
39%
of UK towns have a smaller share
6,497
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.

Flood history

Street has flooded in 6 recorded years since 1955, most of all in 2012

Every flood the Environment Agency has mapped inside Street’s built-up area, newest first. The record is fullest for big river floods; small and surface-water floods are often missing.

  1. 2014January 2014: River flooding recorded2 hectares inside today’s built-up area
  2. 2012November 2012: River flooding recorded2 hectares inside today’s built-up area
  3. 2009March 2009: River flooding recordedUnder 1 hectare inside today’s built-up area · North Wessex Brue Parrett Yeo
  4. 2008December 2008: River flooding recordedUnder 1 hectare inside today’s built-up area
  5. 1960October 1960: River flooding recordedUnder 1 hectare inside today’s built-up area
  6. 1955December 1955: River flooding recordedUnder 1 hectare inside today’s built-up area
The worst: 20122 ha

Floodwater covered 2 hectares of what is now Street in 2012, the largest flood the record holds here (November).

14 of Street’s households today live inside the outline of a recorded flood.

Since 2012, the largest recorded flood inside the town covered 2 hectares.

River levels

The River Brue at Clyse Hole: highest 1.20 m, in January 2004

The highest level each winter (October to September) at the Environment Agency’s Clyse Hole gauge (Glastonbury), since 1992. The river normally runs between 0.14 m and 0.80 m here.

Highest level each winter, metres
Winter 1992–93: highest 1.06 m · 11 days above the normal rangeWinter 1994–95: highest 1.10 m · 18 days above the normal rangeWinter 1995–96: highest 1.08 m · 7 days above the normal rangeWinter 1996–97: highest 0.95 m · 3 days above the normal rangeWinter 1997–98: highest 1.10 m · 16 days above the normal rangeWinter 1998–99: highest 1.17 m · 18 days above the normal rangeWinter 1999–00: highest 1.18 m on 4 April 2000 · 31 days above the normal rangeWinter 2000–01: highest 1.18 m on 30 October 2000 · 37 days above the normal rangeWinter 2001–02: highest 1.15 m · 13 days above the normal rangeWinter 2002–03: highest 1.20 m on 14 November 2002 · 26 days above the normal rangeWinter 2003–04: highest 1.20 m on 12 January 2004 · 7 days above the normal rangeWinter 2004–05: highest 1.17 m · 7 days above the normal rangeWinter 2005–06: highest 1.20 m on 2 December 2005 · 12 days above the normal rangeWinter 2006–07: highest 1.07 m · 22 days above the normal rangeWinter 2007–08: highest 1.09 m · 19 days above the normal rangeWinter 2015–16: highest 1.01 m · 9 days above the normal rangeWinter 2016–17: highest 1.01 m · 3 days above the normal rangeWinter 2017–18: highest 0.99 m · 12 days above the normal rangeWinter 2018–19: highest 0.95 m · 3 days above the normal rangeWinter 2019–20: highest 0.97 m · 18 days above the normal rangeWinter 2020–21: highest 0.96 m · 13 days above the normal rangeWinter 2021–22: highest 0.94 m · 4 days above the normal rangeWinter 2022–23: highest 0.99 m · 14 days above the normal rangeWinter 2023–24: highest 0.99 m · 37 days above the normal rangeWinter 2024–25: highest 0.98 m · 19 days above the normal rangeWinter 2025–26: highest 0.97 m · 14 days above the normal range’02–03’03–04’05–06Record 1.20 m, 2004Top of normal range
1992–932025–26
The highest days on record
  • 14 November 20021.20 m
  • 12 January 20041.20 m
  • 6 February 20041.20 m
  • 2 December 20051.20 m
  • 22 December 20021.19 m
  • 1 January 20031.19 m

The River Brue has topped its normal range on 393 days since 1992, most in the winters of 2000–01 and 2023–24. By its highest day, the winter of 2025–26 was the 22nd-highest of the 26.

Environment Agency Hydrology API, Clyse Hole (station 52206), 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 Street · 5 warnings in 20 years

The Environment Agency has 1 flood warning area and 1 alert area reaching into the town; warnings since the service began in 2006.

Now: no flood warnings or alerts for Street (checked 6 November 2026, 20:26). Check for flooding on GOV.UK →
Warnings and alerts each year for areas in Street
06
07
08
09
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
Flood warning (flooding expected)Flood alert (flooding possible)

Of the 5 warnings, 5 were for River Brue and Glastonbury Millstream from Lovington to Highbridge. 2024 had the most warnings (2); 2012 the most alerts (22).

The most recent warning was on 26 January 2025.

Show the 2 warning and alert areas
AreaKindSince 2006Now
River Brue and Glastonbury Millstream from Lovington to HighbridgeWarning area5None
East Somerset RiversAlert area187None

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 Street are in radon Affected Areas, up to the 10–30% 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).

ST4734: 10–30% of homes above the action levelST4735: 10–30% of homes above the action levelST4736: 10–30% of homes above the action levelST4737: 5–10% of homes above the action levelST4834: 10–30% of homes above the action levelST4835: 10–30% of homes above the action levelST4836: 10–30% of homes above the action levelST4837: 5–10% of homes above the action levelST4935: 10–30% of homes above the action levelST4936: 10–30% of homes above the action levelST4937: 5–10% of homes above the action level© OpenStreetMap contributors · BGS/UKHSA
5–10%10–30%
Share of the town’s area in each band
5–10% of homes9%
10–30% of homes91%

100% of Street’s built-up area is in a radon Affected Area (1% of homes or more above the action level), and 100% in squares of 5% or more.

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 Street

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

Walton: Hazard risk B−Glastonbury: Hazard risk DSomerton: Hazard risk B−Keinton Mandeville: Hazard risk B−Langport: Hazard risk C−Wells: Hazard risk DPilton: Hazard risk C+WaltonGlastonburySomertonKeinton MandevilleLangportWellsPiltonStreet
ABCD
TownPeopleHigh or mediumLowHazard
Street12,707under 0.1%0.4%B
Walton1,1490.3%0.4%B−
Glastonbury8,3045.2%0.6%D
Somerton5,1060.2%0%B−
Keinton Mandeville1,2160.2%0%B−
Langport3,5782.8%6.5%C−
Wells12,0977%2.2%D
Pilton1,1040.5%1.2%C+

Wells, 7.2 miles north-east, has the most homes at risk around Street (7% at high or medium).

Be ready

Get ready for what Street 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.
  • Street’s warning areas include River Brue and Glastonbury Millstream from Lovington to Highbridge.
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 Street
  • 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.
  • 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.

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

Questions about flooding and hazards in Street

Does Street flood?

The last flood the Environment Agency recorded inside the town was in January 2014. Under 0.1% 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 2.8% of homes are at high or medium risk from surface water, when heavy rain overwhelms the drains. Street grades B for hazard risk against UK towns.

Which parts of Street are at risk of flooding?

From rivers and the sea, the places the Environment Agency warns directly: River Brue and Glastonbury Millstream from Lovington to Highbridge. 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 Street last flood?

The recorded flood outlines inside the town run from 1955 to 2014 (6 years); the largest was in 2012. Flood warnings have been issued for parts of the town since 2006, most recently on 26 January 2025.

Is Street at risk of surface water flooding?

About 1.2% of homes are at high risk and 1.6% at medium risk from surface water, against under 0.1% 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 Street?

100% of the town’s built-up area is in a radon Affected Area on the BGS/UKHSA atlas, and 100% 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 Street now?

No flood warning or alert was in force near Street at 6 November 2026, 20:26. 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.