Does CM3 flood?

Yes — parts of the CM3 district carry real flood risk: 49 of its 157 at-risk postcodes reach the Environment Agency's High likelihood band. The CM3 postcode district covers South Woodham-Elmwood and Woodville, Purleigh, Broomfield and The Walthams, South Woodham-Chetwood and Collingwood, close to Sandon, Wickford, Chelmsford, and surrounding villages in Essex.

157 postcodes in the CM3 district appear in the Environment Agency's rivers-and-sea flood-risk dataset — worst bands: 49 high, 19 medium, 37 low, 52 very low. A postcode not listed here has no properties in any recorded risk band (which is good news, but never proof it cannot flood).

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Which CM3 postcodes are at risk?

CM3 1AH up to High CM3 1AQ up to High CM3 1AS up to High CM3 1BG up to High CM3 1BP up to High CM3 1BT up to High CM3 1FH up to High CM3 2BA up to High CM3 2EU up to High CM3 3AU up to High CM3 3AY up to High CM3 3EW up to High CM3 3FY up to High CM3 3NS up to High CM3 3NU up to High CM3 3PJ up to High CM3 4BQ up to High CM3 4BS up to High CM3 4BT up to High CM3 4FL up to High CM3 5QU up to High CM3 5WP up to High CM3 5XH up to High CM3 6AL up to High CM3 6BD up to High CM3 6DQ up to High CM3 6EG up to High CM3 6EQ up to High CM3 6GU up to High CM3 6HP up to High CM3 6HQ up to High CM3 6JP up to High CM3 6LG up to High CM3 6LP up to High CM3 6LR up to High CM3 6LS up to High CM3 6LU up to High CM3 6NB up to High CM3 6NF up to High CM3 6NH up to High CM3 6NJ up to High CM3 6NL up to High CM3 6SF up to High CM3 6SQ up to High CM3 6SS up to High CM3 7AD up to High CM3 7AL up to High CM3 7BG up to High CM3 8EE up to High CM3 1AG up to Medium CM3 1AT up to Medium CM3 1JP up to Medium CM3 1ND up to Medium CM3 2PQ up to Medium CM3 3LN up to Medium CM3 3NT up to Medium CM3 4BU up to Medium CM3 4ES up to Medium CM3 6AW up to Medium CM3 6BN up to Medium CM3 6EH up to Medium CM3 6EJ up to Medium CM3 6FJ up to Medium CM3 6GH up to Medium CM3 6LF up to Medium CM3 6NA up to Medium CM3 6TP up to Medium CM3 7AW up to Medium CM3 1BS up to Low CM3 1LL up to Low CM3 2NP up to Low CM3 2NQ up to Low CM3 2PW up to Low CM3 3PB up to Low CM3 4BE up to Low CM3 4BG up to Low CM3 4LS up to Low CM3 4NB up to Low CM3 4ND up to Low CM3 4NE up to Low CM3 4XH up to Low CM3 5GH up to Low CM3 5GL up to Low CM3 5GW up to Low CM3 5QY up to Low CM3 5QZ up to Low CM3 5RZ up to Low CM3 5ZW up to Low CM3 6AG up to Low CM3 6AR up to Low CM3 6BB up to Low CM3 6DH up to Low CM3 6EL up to Low CM3 6GJ up to Low CM3 6LJ up to Low CM3 6LW up to Low CM3 6LZ up to Low CM3 6NT up to Low CM3 6RJ up to Low CM3 6TT up to Low CM3 6TY up to Low CM3 6UD up to Low CM3 7AZ up to Low CM3 8DY up to Low CM3 8DZ up to Low CM3 1JZ up to Very low CM3 1ZJ up to Very low CM3 5BF up to Very low CM3 5BL up to Very low CM3 5DD up to Very low CM3 5DE up to Very low CM3 5FB up to Very low CM3 5FD up to Very low CM3 5FW up to Very low CM3 5GU up to Very low CM3 5JE up to Very low CM3 5JN up to Very low CM3 5JR up to Very low CM3 5JS up to Very low CM3 5JU up to Very low CM3 5JX up to Very low CM3 5JY up to Very low CM3 5JZ up to Very low CM3 5LB up to Very low CM3 5LE up to Very low CM3 5LF up to Very low CM3 5LG up to Very low CM3 5LX up to Very low CM3 5RU up to Very low CM3 5SH up to Very low CM3 5SJ up to Very low CM3 5SL up to Very low CM3 5SN up to Very low CM3 5SP up to Very low CM3 5SW up to Very low CM3 5SX up to Very low CM3 5SY up to Very low CM3 5TB up to Very low CM3 5TD up to Very low CM3 5TG up to Very low CM3 5TQ up to Very low CM3 5WA up to Very low CM3 5XA up to Very low CM3 5XB up to Very low CM3 5XD up to Very low CM3 5XF up to Very low CM3 5XJ up to Very low CM3 5XQ up to Very low CM3 5XU up to Very low CM3 5YA up to Very low CM3 5YB up to Very low CM3 5YE up to Very low CM3 5YL up to Very low CM3 5ZE up to Very low CM3 5ZL up to Very low CM3 5ZT up to Very low CM3 6LE up to Very low

Rivers and flooding history near CM3

The rivers that matter here, each monitored live on FloodRadar:

61 official flood warnings and alerts have been raised within ~10 km of the district's centre since 2006 (28 at warning level or above), most recently 7 February 2026. Warnings cover flood areas, not individual addresses.

Recorded flood extents near the district (Environment Agency record):

Records, not floods: no outline on the record is not evidence a place has not flooded.

🏠 Buying or renting in CM3? The full property flood-risk report covers any postcode here — the official likelihood band, every recorded flood nearby with distances, warning history year by year, how the local rivers behave, and an insurance outlook, print-ready for £19. See what's in the report →

Flood risk in nearby postcode districts

CM2 CM4 CM1 CM5 CM0 CM6 CM7 CM8

Band = the worst likelihood band of any property in that postcode (EA Risk of Flooding from Rivers & Sea, defence-adjusted, area-level). Check any postcode in detail — or get the full £19 property report — at the property flood-risk report. © 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.