Does CT21 flood?

Yes — parts of the CT21 district carry real flood risk: 58 of its 265 at-risk postcodes reach the Environment Agency's High likelihood band. The CT21 postcode district covers Hythe, Hythe Rural, Romney Marsh, close to Sellindge, Folkestone, Aldington, and surrounding villages in Kent.

265 postcodes in the CT21 district appear in the Environment Agency's rivers-and-sea flood-risk dataset — worst bands: 58 high, 20 medium, 33 low, 154 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 CT21 postcodes are at risk?

CT21 4DD up to High CT21 4DE up to High CT21 4DY up to High CT21 4EA up to High CT21 4NF up to High CT21 4QS up to High CT21 5LP up to High CT21 5PA up to High CT21 5PB up to High CT21 5PD up to High CT21 5PE up to High CT21 5PW up to High CT21 5RL up to High CT21 5RT up to High CT21 5RY up to High CT21 5SL up to High CT21 5SN up to High CT21 5SP up to High CT21 5SQ up to High CT21 5SR up to High CT21 6AB up to High CT21 6AD up to High CT21 6AE up to High CT21 6AH up to High CT21 6AJ up to High CT21 6AL up to High CT21 6AN up to High CT21 6AP up to High CT21 6AR up to High CT21 6AS up to High CT21 6AT up to High CT21 6AU up to High CT21 6AW up to High CT21 6AX up to High CT21 6AY up to High CT21 6BA up to High CT21 6BT up to High CT21 6BU up to High CT21 6BX up to High CT21 6DE up to High CT21 6DP up to High CT21 6DQ up to High CT21 6DR up to High CT21 6DS up to High CT21 6DT up to High CT21 6DU up to High CT21 6DW up to High CT21 6DX up to High CT21 6DY up to High CT21 6FA up to High CT21 6FJ up to High CT21 6FN up to High CT21 6HD up to High CT21 6HE up to High CT21 6HF up to High CT21 6HG up to High CT21 6HH up to High CT21 6PH up to High CT21 4SG up to Medium CT21 5JA up to Medium CT21 5JR up to Medium CT21 5JT up to Medium CT21 5JW up to Medium CT21 5LN up to Medium CT21 5LZ up to Medium CT21 5NA up to Medium CT21 5NB up to Medium CT21 5ND up to Medium CT21 5NH up to Medium CT21 5NQ up to Medium CT21 5NU up to Medium CT21 5NX up to Medium CT21 5PF up to Medium CT21 5PQ up to Medium CT21 5QH up to Medium CT21 5RZ up to Medium CT21 5SA up to Medium CT21 6HW up to Medium CT21 4DF up to Low CT21 4DZ up to Low CT21 4EB up to Low CT21 4ND up to Low CT21 4NG up to Low CT21 4NL up to Low CT21 5FD up to Low CT21 5JL up to Low CT21 5JN up to Low CT21 5LR up to Low CT21 5NG up to Low CT21 5NJ up to Low CT21 5NL up to Low CT21 5NY up to Low CT21 5NZ up to Low CT21 5PH up to Low CT21 5PN up to Low CT21 5QA up to Low CT21 5RB up to Low CT21 5RH up to Low CT21 5RQ up to Low CT21 6AG up to Low CT21 6ED up to Low CT21 6EQ up to Low CT21 6ER up to Low CT21 6HP up to Low CT21 6HT up to Low CT21 6HU up to Low CT21 6JZ up to Low CT21 6LP up to Low CT21 6LR up to Low CT21 6LZ up to Low CT21 6RD up to Low CT21 4AA up to Very low CT21 4AP up to Very low CT21 4AW up to Very low CT21 4AX up to Very low CT21 4AY up to Very low CT21 4AZ up to Very low CT21 4BF up to Very low CT21 4BN up to Very low CT21 4BQ up to Very low CT21 4BZ up to Very low CT21 4DA up to Very low CT21 4DB up to Very low CT21 4DT up to Very low CT21 4NA up to Very low CT21 4NB up to Very low CT21 4NE up to Very low CT21 4NH up to Very low CT21 4NJ up to Very low CT21 4NN up to Very low CT21 4NP up to Very low CT21 4NQ up to Very low CT21 4NR up to Very low CT21 4NS up to Very low CT21 4NT up to Very low CT21 4NU up to Very low CT21 4NW up to Very low CT21 4PJ up to Very low CT21 5AU up to Very low CT21 5AX up to Very low CT21 5JB up to Very low CT21 5JD up to Very low CT21 6AA up to Very low CT21 6AZ up to Very low CT21 6BB up to Very low CT21 6BD up to Very low CT21 6BL up to Very low CT21 6BP up to Very low CT21 6BS up to Very low CT21 6BY up to Very low CT21 6BZ up to Very low CT21 6DA up to Very low CT21 6DB up to Very low CT21 6DD up to Very low CT21 6DF up to Very low CT21 6DG up to Very low CT21 6DH up to Very low CT21 6DL up to Very low CT21 6DN up to Very low CT21 6EA up to Very low CT21 6EH up to Very low CT21 6EN up to Very low CT21 6EP up to Very low CT21 6ES up to Very low CT21 6ET up to Very low CT21 6EU up to Very low CT21 6EX up to Very low CT21 6EY up to Very low CT21 6FB up to Very low CT21 6FD up to Very low CT21 6FG up to Very low CT21 6FP up to Very low CT21 6FQ up to Very low CT21 6GY up to Very low CT21 6HA up to Very low CT21 6HN up to Very low CT21 6HQ up to Very low CT21 6HR up to Very low CT21 6HS up to Very low CT21 6HX up to Very low CT21 6HZ up to Very low CT21 6JE up to Very low CT21 6JF up to Very low CT21 6JG up to Very low CT21 6JH up to Very low CT21 6JJ up to Very low CT21 6JN up to Very low CT21 6JP up to Very low CT21 6JQ up to Very low CT21 6JR up to Very low CT21 6JS up to Very low CT21 6JT up to Very low CT21 6JU up to Very low CT21 6JW up to Very low CT21 6JX up to Very low CT21 6LA up to Very low CT21 6LB up to Very low CT21 6LD up to Very low CT21 6LG up to Very low CT21 6LH up to Very low CT21 6LL up to Very low CT21 6LN up to Very low CT21 6LQ up to Very low CT21 6LS up to Very low CT21 6LT up to Very low CT21 6LU up to Very low CT21 6LW up to Very low CT21 6LX up to Very low CT21 6LY up to Very low CT21 6NA up to Very low CT21 6NB up to Very low CT21 6ND up to Very low CT21 6NE up to Very low CT21 6NG up to Very low CT21 6NH up to Very low CT21 6NJ up to Very low CT21 6NL up to Very low CT21 6NN up to Very low CT21 6NP up to Very low CT21 6NQ up to Very low CT21 6NR up to Very low CT21 6NS up to Very low CT21 6NT up to Very low CT21 6NU up to Very low CT21 6NW up to Very low CT21 6NX up to Very low CT21 6PA up to Very low CT21 6PB up to Very low CT21 6PE up to Very low CT21 6PG up to Very low CT21 6PJ up to Very low CT21 6PL up to Very low CT21 6PN up to Very low CT21 6PP up to Very low CT21 6PQ up to Very low CT21 6PR up to Very low CT21 6PS up to Very low CT21 6PT up to Very low CT21 6PU up to Very low CT21 6PW up to Very low CT21 6PX up to Very low CT21 6PY up to Very low CT21 6PZ up to Very low CT21 6QA up to Very low CT21 6QB up to Very low CT21 6QD up to Very low CT21 6QE up to Very low CT21 6QF up to Very low CT21 6QG up to Very low CT21 6QH up to Very low CT21 6QL up to Very low CT21 6QN up to Very low CT21 6QP up to Very low CT21 6QQ up to Very low CT21 6QR up to Very low CT21 6QS up to Very low CT21 6QT up to Very low CT21 6QU up to Very low CT21 6QW up to Very low CT21 6QX up to Very low CT21 6QY up to Very low CT21 6QZ up to Very low CT21 6RA up to Very low CT21 6RB up to Very low CT21 6SL up to Very low

Rivers and flooding history near CT21

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

8 official flood warnings and alerts have been raised within ~10 km of the district's centre since 2006, most recently 6 July 2025. 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 CT21? 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

CT20 CT19 CT18 CT17 CT16 CT15 CT14 CT13

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.