Does CM9 flood?

Yes — parts of the CM9 district carry real flood risk: 112 of its 230 at-risk postcodes reach the Environment Agency's High likelihood band. The CM9 postcode district covers Heybridge East, Heybridge West, Maldon North, Wickham Bishops and Woodham, close to Rivenhall End, Witham, Sandon, and surrounding villages in Essex.

230 postcodes in the CM9 district appear in the Environment Agency's rivers-and-sea flood-risk dataset — worst bands: 112 high, 26 medium, 56 low, 36 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 CM9 postcodes are at risk?

CM9 4AA up to High CM9 4BT up to High CM9 4DB up to High CM9 4DR up to High CM9 4EJ up to High CM9 4ER up to High CM9 4GD up to High CM9 4LA up to High CM9 4LB up to High CM9 4LD up to High CM9 4LE up to High CM9 4LF up to High CM9 4LN up to High CM9 4LY up to High CM9 4NA up to High CM9 4NB up to High CM9 4NE up to High CM9 4NF up to High CM9 4NG up to High CM9 4NH up to High CM9 4NJ up to High CM9 4NL up to High CM9 4NN up to High CM9 4NP up to High CM9 4NQ up to High CM9 4NT up to High CM9 4NW up to High CM9 4NX up to High CM9 4PG up to High CM9 4PL up to High CM9 4PN up to High CM9 4PQ up to High CM9 4PS up to High CM9 4PT up to High CM9 4QP up to High CM9 4QR up to High CM9 4QT up to High CM9 4QU up to High CM9 4QX up to High CM9 4QY up to High CM9 4RA up to High CM9 4RD up to High CM9 4RH up to High CM9 4RP up to High CM9 4RR up to High CM9 4RS up to High CM9 4RY up to High CM9 4RZ up to High CM9 4SA up to High CM9 4SD up to High CM9 4SE up to High CM9 4SF up to High CM9 4SG up to High CM9 4SJ up to High CM9 4SL up to High CM9 4SQ up to High CM9 4SS up to High CM9 4SW up to High CM9 4TB up to High CM9 4TD up to High CM9 4TE up to High CM9 4TG up to High CM9 4TL up to High CM9 4UP up to High CM9 4UU up to High CM9 4XB up to High CM9 4XP up to High CM9 5HG up to High CM9 5HL up to High CM9 5HN up to High CM9 5HT up to High CM9 5JQ up to High CM9 5UR up to High CM9 6FR up to High CM9 6LL up to High CM9 6NN up to High CM9 6NQ up to High CM9 6NZ up to High CM9 6PE up to High CM9 6PJ up to High CM9 6PP up to High CM9 6PW up to High CM9 6QA up to High CM9 6QU up to High CM9 6QX up to High CM9 6QY up to High CM9 6RA up to High CM9 6RB up to High CM9 6RF up to High CM9 8BQ up to High CM9 8HH up to High CM9 8HJ up to High CM9 8HL up to High CM9 8HN up to High CM9 8HS up to High CM9 8HW up to High CM9 8JA up to High CM9 8JD up to High CM9 8JF up to High CM9 8JQ up to High CM9 8LS up to High CM9 8LX up to High CM9 8NA up to High CM9 8NS up to High CM9 8QB up to High CM9 8SE up to High CM9 8SS up to High CM9 8TB up to High CM9 8TP up to High CM9 8TZ up to High CM9 8UH up to High CM9 8WB up to High CM9 4DD up to Medium CM9 4HH up to Medium CM9 4JB up to Medium CM9 4LJ up to Medium CM9 4LL up to Medium CM9 4LQ up to Medium CM9 4LT up to Medium CM9 4PA up to Medium CM9 4PB up to Medium CM9 4QF up to Medium CM9 4RG up to Medium CM9 4RJ up to Medium CM9 4RN up to Medium CM9 4RQ up to Medium CM9 4SN up to Medium CM9 4ST up to Medium CM9 4UN up to Medium CM9 4UR up to Medium CM9 4UY up to Medium CM9 4XD up to Medium CM9 8AL up to Medium CM9 8LU up to Medium CM9 8LY up to Medium CM9 8RW up to Medium CM9 8RY up to Medium CM9 8ST up to Medium CM9 4BU up to Low CM9 4DT up to Low CM9 4DY up to Low CM9 4GG up to Low CM9 4LS up to Low CM9 4LU up to Low CM9 4ND up to Low CM9 4NU up to Low CM9 4PW up to Low CM9 4PX up to Low CM9 4QS up to Low CM9 4RB up to Low CM9 4RF up to Low CM9 4RT up to Low CM9 4RW up to Low CM9 4RX up to Low CM9 4SB up to Low CM9 4UG up to Low CM9 4UQ up to Low CM9 4US up to Low CM9 4XL up to Low CM9 4YL up to Low CM9 4YU up to Low CM9 4YX up to Low CM9 4YY up to Low CM9 4YZ up to Low CM9 5FA up to Low CM9 5GU up to Low CM9 6FB up to Low CM9 6FD up to Low CM9 6GJ up to Low CM9 6JB up to Low CM9 6JW up to Low CM9 6NA up to Low CM9 6NU up to Low CM9 6NY up to Low CM9 6PL up to Low CM9 6QD up to Low CM9 6RP up to Low CM9 6UE up to Low CM9 6WB up to Low CM9 6XS up to Low CM9 6XX up to Low CM9 6YW up to Low CM9 6YX up to Low CM9 6ZF up to Low CM9 6ZS up to Low CM9 8AH up to Low CM9 8AQ up to Low CM9 8AT up to Low CM9 8AU up to Low CM9 8AX up to Low CM9 8FE up to Low CM9 8FP up to Low CM9 8PR up to Low CM9 8SB up to Low CM9 4AB up to Very low CM9 4AD up to Very low CM9 4AN up to Very low CM9 4JH up to Very low CM9 4LP up to Very low CM9 4LZ up to Very low CM9 4NR up to Very low CM9 4NS up to Very low CM9 4NY up to Very low CM9 4PD up to Very low CM9 4PE up to Very low CM9 4PF up to Very low CM9 4PH up to Very low CM9 4PJ up to Very low CM9 4PP up to Very low CM9 4PU up to Very low CM9 4QA up to Very low CM9 4QG up to Very low CM9 4QH up to Very low CM9 4QN up to Very low CM9 4QW up to Very low CM9 4QZ up to Very low CM9 4TF up to Very low CM9 4TJ up to Very low CM9 4UD up to Very low CM9 4UE up to Very low CM9 4UF up to Very low CM9 4UJ up to Very low CM9 4YA up to Very low CM9 4YB up to Very low CM9 4YN up to Very low CM9 4YR up to Very low CM9 4YS up to Very low CM9 4YT up to Very low CM9 4YW up to Very low CM9 6PN up to Very low

Rivers and flooding history near CM9

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

28 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 8 April 2024. 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 CM9? 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

CM8 CM11 CM7 CM12 CM6 CM13 CM5 CM14

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.