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Up to High likelihood
Properties in CM3 6HP 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% | 7 | 6 |
| Medium | 1% – 3.3% | 1 | 1 |
| Low | 0.1% – 1% | 4 | 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.
CM3 6HP gets about 571 mm of rain a year on average (wettest month October, 63 mm; driest March, 34 mm). That is 51% drier than 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 river map has no watercourse within 1 km of the centre of CM3 6HP.
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; 5 recorded flood outlines mapped nearby; 23 official warnings since 2006.
The map above shows the real EA rivers & sea likelihood cells around CM3 6HP. 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 |
|---|---|---|
| Dec 2013 | 2013 Flood Outline | ~82.7 km |
| Jan 1968 | 1968 September Flood Outline | ~44.0 km |
| Jun 1958 | 1958 Flood Outline | ~10.3 km |
| Jan 1953 | 1953 Coast Flood Outline Essex | ~10.1 km |
| Feb 1947 | 1947 Flood Outline | ~21.8 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, 11 warnings nearby) ▶ replay it here · Ciara (2020, 1 warnings nearby) ▶ replay it here
| Gauge | River | Distance | Typical high | Highest on record |
|---|---|---|---|---|
| Sandon Bridge | Sandon Brook | 12.8 km | 0.75 m | 1.66 m |
| Wickford | River Crouch | 14.3 km | 1.67 m | 2.69 m |
| GUITHAVON VALLEY FGS WITHAM | — | 15.4 km | — | — |
| Guithavon Valley | River Brain | 15.4 km | 0.61 m | 1.46 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 |
|---|---|---|---|---|
| Latchingdon Water Recycling Centre | Latchington Brook Mundon Crk B | 1.4 km | 7 (2024) | 65 |
| Cold Norton - Stow Road Ps | Tributary Of The River Crouch | 3.6 km | 25 (2024) | 234 |
| Purleigh Water Recycling Centre | Trib Of Mundon Wash Nt River | 4.0 km | 35 (2024) | 419 |
| Cardnells Sp, Maylandsea | Blackwater | 4.0 km | 1 (2024) | 3 |
Official annual EDM figures — a water-quality signal for local watercourses, not a property flood-risk factor.
4 mapped flood-defence assets within 500 m — nearest ~46 m (natural high ground). 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 CM3 6HP — all in the CM3 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. 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 CM3 district.