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Does CM23 flood?

Yes — parts of the CM23 district carry real flood risk: 42 of its 121 at-risk postcodes reach the Environment Agency's High likelihood band. The CM23 postcode district covers Stort Valley, close to Bishop's Stortford, Stansted Mountfitchet, Little Hadham, and surrounding villages in parts of Essex and Hertfordshire.

121 postcodes in the CM23 district appear in the Environment Agency's rivers-and-sea flood-risk dataset — worst bands: 42 high, 12 medium, 67 low. A postcode not listed here has no properties in any recorded risk band (which is good news, but never proof it cannot flood).

Free preview first · full report £19

Which CM23 postcodes are at risk?

CM23 1DE up to High CM23 1DQ up to High CM23 2EJ up to High CM23 2EN up to High CM23 2EQ up to High CM23 2ER up to High CM23 2EW up to High CM23 2EY up to High CM23 2HG up to High CM23 2HR up to High CM23 2JW up to High CM23 2JY up to High CM23 2SS up to High CM23 2ST up to High CM23 3AE up to High CM23 3AS up to High CM23 3AX up to High CM23 3BD up to High CM23 3DH up to High CM23 3DP up to High CM23 3DR up to High CM23 3DS up to High CM23 3DT up to High CM23 3DW up to High CM23 3DX up to High CM23 3DY up to High CM23 3FR up to High CM23 3JG up to High CM23 3JH up to High CM23 3JJ up to High CM23 3JN up to High CM23 3JQ up to High CM23 3JX up to High CM23 3LE up to High CM23 3LJ up to High CM23 3RD up to High CM23 3XG up to High CM23 3XQ up to High CM23 3YP up to High CM23 4AY up to High CM23 5AS up to High CM23 5AZ up to High CM23 2DN up to Medium CM23 2EL up to Medium CM23 2HA up to Medium CM23 2HH up to Medium CM23 2SU up to Medium CM23 3AB up to Medium CM23 3BJ up to Medium CM23 3DA up to Medium CM23 3DQ up to Medium CM23 3JE up to Medium CM23 4BA up to Medium CM23 5BJ up to Medium CM23 1BG up to Low CM23 1DA up to Low CM23 1DF up to Low CM23 1DJ up to Low CM23 1DN up to Low CM23 1DX up to Low CM23 1DY up to Low CM23 1JB up to Low CM23 1JE up to Low CM23 1JH up to Low CM23 2AH up to Low CM23 2AJ up to Low CM23 2BB up to Low CM23 2BN up to Low CM23 2BP up to Low CM23 2DF up to Low CM23 2EB up to Low CM23 2EU up to Low CM23 2HD up to Low CM23 2HU up to Low CM23 2HZ up to Low CM23 2JU up to Low CM23 2XR up to Low CM23 3AG up to Low CM23 3AL up to Low CM23 3AR up to Low CM23 3AT up to Low CM23 3AY up to Low CM23 3AZ up to Low CM23 3BG up to Low CM23 3BL up to Low CM23 3BP up to Low CM23 3BT up to Low CM23 3BX up to Low CM23 3BY up to Low CM23 3EG up to Low CM23 3FT up to Low CM23 3FX up to Low CM23 3GD up to Low CM23 3GE up to Low CM23 3GN up to Low CM23 3HU up to Low CM23 3JB up to Low CM23 3JL up to Low CM23 3LL up to Low CM23 3NA up to Low CM23 3NE up to Low CM23 3NS up to Low CM23 3SA up to Low CM23 3UH up to Low CM23 3US up to Low CM23 3XY up to Low CM23 3YJ up to Low CM23 3YN up to Low CM23 3YS up to Low CM23 3YT up to Low CM23 3YW up to Low CM23 4AU up to Low CM23 4AX up to Low CM23 5AN up to Low CM23 5AP up to Low CM23 5FA up to Low CM23 5GZ up to Low CM23 5NZ up to Low CM23 5PN up to Low CM23 5TT up to Low CM23 7PH up to Low

Rivers and flooding history near CM23

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

95 official flood warnings and alerts have been raised within ~10 km of the district's centre since 2006 (14 at warning level or above), most recently 16 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 CM23? 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

CM22 CM24 CM21 CM20 CM19 CM18 CM17 CM16

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.