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Does Chesham flood? 65 postcodes in Chesham are in the Environment Agency's rivers-and-sea flood-risk data (44 High, 8 Medium likelihood) — the breakdown is further down this page.
No official flood warning is active nearby and the closest river stations are within normal ranges.
Updated 2026-10-09 13:00:27 UTC · Official GOV.UK warnings · Flood preparation & help guide
Chesham is a market town and civil parish in Buckinghamshire, England, United Kingdom, 11 miles (18 km) south-east of the county town of Aylesbury, about 26 miles (42 km) north-west of central London, and part of the London commuter belt. It is in the Chess Valley, surrounded by farmland. The earliest records of Chesham as a settlement are from the second half of the 10th century, although there is archaeological evidence of people in this area from around 8000 BC. Henry III granted a royal charter for a weekly market in 1257.
Ordnance Survey places 65 postcodes in Chesham in the Environment Agency's rivers-and-sea flood-risk dataset (Risk of Flooding from Rivers and Sea). Each postcode is counted once, under the worst band any of its properties reaches; together they hold 655 properties in the EA dataset's likelihood bands.
| EA likelihood band | Postcodes (worst band) | Properties in the EA dataset | of which homes |
|---|---|---|---|
| High | 44 | 321 | 181 |
| Medium | 8 | 144 | 117 |
| Low | 13 | 190 | 103 |
| Very low | 0 | 0 | 0 |
| All bands | 65 | 655 | 401 |
This dataset covers flooding from rivers and the sea only — one of five flood sources. Surface water, groundwater, sewers and reservoirs are assessed separately, so a postcode missing from it is not proof that a place cannot flood. The band describes the land around properties (allowing for defences), not any single address and not today's conditions.
Amersham · Berkhamsted · Wendover · Chalfont St Peter
Flood-risk bands: © 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.
The nearest watercourse on the river map is the River Chess, about 10 m from the middle of Chesham's gauges. It flows into the River Colne about 17 km downstream.
A gauge downstream shows water that has already passed this point; one upstream sees it first. Distances along the river are from the point on the River Chess nearest the middle of Chesham's gauges. From Ordnance Survey’s river map (OS Open Rivers), which leaves out small streams, ditches and culverts, so a nearer one may exist. This describes where water goes on the map; it says nothing about flooding at any address. Contains OS data © Crown copyright and database rights 2026.
Chesham is monitored by 1 Environment Agency river level station on the River Chess, in Buckinghamshire. Water levels are updated every 15 minutes, providing real-time flood monitoring for the area.
The River Chess is monitored by 1 station (Chesham). Each station records water levels continuously, with data synced to FloodRadar every 5 minutes.
There are 7 Environment Agency flood warning areas within 10km of Chesham. When the EA issues a flood warning for any of these areas, it will appear on this page. These include: The River Chess at Chesham; Areas at risk of groundwater flooding in and around Chesham; The River Misbourne at Amersham, including Amersham Old Town, from Little Missenden to Chalfont St Giles; The River Chess at Chenies, including Latimer and Sarratt.
There is 1 storm overflow within 5km of Chesham. None of the 1 with a reporting monitor is currently discharging. Enable "Sewage" on the map above to see their locations.
It has its own page of live status and past discharges:
If flooding is forecast in Chesham, call Floodline on 0345 988 1188 for the latest information. Move valuables upstairs, turn off gas and electricity if safe to do so, and avoid walking or driving through flood water. Sign up for flood warnings on any station page above to receive email alerts when water levels rise. For emergency numbers, a preparation checklist and insurance guidance, see our flood help & preparation guide.
Chesham gets about 801 mm of rain a year on average (wettest month November, 89 mm; driest March, 50 mm). That is 31% drier than the UK as a whole, which averages 1,163 mm a year. See the rain gauges →
A thirty-year average for the area, not a forecast and not a flood risk on its own. 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.
Floods whose mapped extent (EA Recorded Flood Outlines) reached within ~5 km of the town centre — most recent first. These are records of mapped extents, not a full list of floods. See them on the map →
Records, not floods: no outline on the record is not evidence a place has not flooded.
Current verdict: Normal. No official flood warning is active nearby and the closest river stations are within normal ranges.
Chesham has river level monitoring on River Chess — 1 monitoring station in total.
Use the GOV.UK Check for Flooding service (check-for-flooding.service.gov.uk) or call Floodline on 0345 988 1188 (24 hours). You can also set up free FloodRadar email or browser alerts from any station page above.
Follow official advice: move valuables and vehicles to safety, never walk or drive through flood water, turn off gas and electricity if safe, and check on vulnerable neighbours. See our flood preparation guide at floodradar.co.uk/flood-help.
Yes — the Environment Agency's Recorded Flood Outlines dataset shows 15 recorded flood extents around the town centre since 1703, most recently in 2014. That is a count of mapped extents, not of separate floods. Records, not floods: no outline on the record is not evidence a place has not flooded. See the flood history link below.
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