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Compton Martin, Bath and North East Somerset
Up to High likelihood
Properties in BS40 6JP sit in the Environment Agency's High flood-likelihood band (worst property). The band is the worst found in the postcode — it describes the land around properties (defence-adjusted, rivers & sea), not any single address, and not today's conditions.
| Likelihood band | Annual chance | Properties | Of which homes |
|---|---|---|---|
| High | greater than 3.3% | 9 | 7 |
| Medium | 1% – 3.3% | 2 | 2 |
| Low | 0.1% – 1% | 1 | 1 |
| Very low | below 0.1% | 0 | 0 |
Over a 25-year mortgage, a property in a high-likelihood area has at least a 57% chance of flooding at least once.
BS40 6JP gets about 1,135 mm of rain a year on average (wettest month November, 125 mm; driest May, 73 mm). That is close to the UK as a whole, which averages 1,163 mm a year.
A thirty-year average for the surrounding area, not a measurement at this address and not a flood risk on its own: a dry area floods when a storm sits over it, and a wet one may drain away perfectly well. Source: Met Office HadUK-Grid 1991–2020 (5 km grid), 2.1 km away. Average rainfall: HadUK-Grid v1.3.2, Met Office. Contains public sector information licensed under the Open Government Licence v3.0.
The ground here sits at about 126 m above sea level and falls 133 m across the surrounding 800 m. Surface water reaching this point runs off ground lying to the south-south-west, 87.9 m higher.
The river map has no watercourse within 1 km of the centre of BS40 6JP.
That means this spot is not on the river map, not that there is no water here: Ordnance Survey’s river map (OS Open Rivers) leaves out small streams, ditches and culverts. Contains OS data © Crown copyright and database rights 2026.
Because properties in the high likelihood band; 1 recorded flood outline mapped nearby; 205 official warnings since 2006.
The map above shows the real EA rivers & sea likelihood cells around BS40 6JP. The small panels are illustrative previews of the report's per-layer map views — the full report draws each layer for real, plus recorded extents, defences and a building picker on an interactive map.
Warnings cover flood areas, not individual addresses.
| Date | Mapped flood extent | Approx. distance |
|---|---|---|
| Nov 2012 | Nov 2012 Floods | ~10.1 km |
These are extents the Environment Agency has mapped, not a list of every flood. Records, not floods: no outline on the record is not evidence a place has not flooded. The full report tests whether any extent covered the exact spot.
2013-14 UK winter floods (2013, 13 warnings nearby) ▶ replay it here · Angus (2016, 4 warnings nearby) ▶ replay it here · Dylan (2017, 3 warnings nearby) ▶ replay it here · Henk (2024, 3 warnings nearby) ▶ replay it here
| Gauge | River | Distance | Typical high | Highest on record |
|---|---|---|---|---|
| Chew Stoke | Chew Stoke Brook | 5.2 km | 0.90 m | 3.13 m |
| Chew Magna Level | Winford Brook | 6.8 km | 0.45 m | 1.20 m |
| Cheddar Gorge | Cheddar Yeo | 8.6 km | 0.36 m | 0.64 m |
| Wookey | River Axe | 11.2 km | 0.77 m | 1.40 m |
Live levels, predictions and rain-response behaviour are on each gauge's page and in the property report.
| Overflow | Discharges into | Distance | Spills | Hours |
|---|---|---|---|---|
| Ubley Water Recycling Centre | Congresbury Yeo, Trib Of Lake | 2.7 km | 108 (2024) | 2,127 |
| East Harptree Wrc | Trib Of River Chew | 2.8 km | 141 (2024) | 2,250 |
| Hinton Blewett Wrc | The Cam Brook | 4.8 km | 45 (2024) | 175 |
| Bishop Sutton Pumping Station | A Tributary Of The River Chew | 4.9 km | 77 (2024) | 184 |
Official annual EDM figures — a water-quality signal for local watercourses, not a property flood-risk factor.
No mapped flood-defence assets within 500 m of the postcode centre. Defences reduce risk, never remove it.
The interactive flood-risk map with a building picker (your exact house, not the postcode), the 2050s climate view, surface-water and planning flood zones at your building, exact recorded-flood distances, year-by-year warning charts, watercourses including culverted streams, an insurance outlook with the Flood Re rules, and a printable document with every dataset receipt — start with the free preview, unlock for £19.
At-risk postcodes near BS40 6JP — all in the BS40 district.
© Environment Agency copyright and/or database right 2025. All rights reserved. Some features of this map are based on digital spatial data from the Centre for Ecology & Hydrology, © NERC (CEH). © Crown Copyright and Database Rights 2025 OS AC0000807064. This product is produced in part from PAF® and Multiple Residence Data, the copyright in which is owned by Royal Mail Group Limited and/or Royal Mail Group plc. All rights reserved. Licence number AC0000807064. Place names: Contains OS data © Crown copyright and database rights 2026. Contains Royal Mail data © Royal Mail copyright and database right 2026. Contains National Statistics data © Crown copyright and database right 2026. Licensed under the Open Government Licence v3.0. Recorded Flood Outlines and warning history © Environment Agency copyright and/or database right 2025. Storm-overflow figures: EA Event Duration Monitoring (England); live overflow status © the water companies, incl. Dŵr Cymru Welsh Water and Scottish Water. Flood defences © Environment Agency (OGL v3). This page summarises public area-level data — it is not a flood-risk survey and not a substitute for the official GOV.UK service. All data sources & licences. More postcodes: the BS40 district.