Does BH21 flood?

Yes — parts of the BH21 district carry real flood risk: 46 of its 259 at-risk postcodes reach the Environment Agency's High likelihood band. The BH21 postcode district covers Wimborne Minster, Stour & Allen Vale, Colehill & Wimborne Minster East, Cranborne & Alderholt, close to Oakley, Sturminster Marshall, Moor Crichel, and surrounding villages in parts of Dorset and Bournemouth, Christchurch and Poole.

259 postcodes in the BH21 district appear in the Environment Agency's rivers-and-sea flood-risk dataset — worst bands: 46 high, 45 medium, 166 low, 2 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 BH21 postcodes are at risk?

BH21 1DU up to High BH21 1DW up to High BH21 1DX up to High BH21 1EE up to High BH21 1JQ up to High BH21 1LN up to High BH21 1NL up to High BH21 1NN up to High BH21 1QF up to High BH21 1QG up to High BH21 1RG up to High BH21 1WS up to High BH21 2FJ up to High BH21 3AF up to High BH21 3AG up to High BH21 3EF up to High BH21 3RH up to High BH21 4AD up to High BH21 4AN up to High BH21 4AQ up to High BH21 4BD up to High BH21 4BT up to High BH21 4BX up to High BH21 4BY up to High BH21 4EL up to High BH21 5AF up to High BH21 5DY up to High BH21 5ES up to High BH21 5ET up to High BH21 5HD up to High BH21 5HQ up to High BH21 5HY up to High BH21 5JE up to High BH21 5JG up to High BH21 5LZ up to High BH21 5NA up to High BH21 5NF up to High BH21 5RE up to High BH21 7BD up to High BH21 7BJ up to High BH21 7DL up to High BH21 7DP up to High BH21 7JL up to High BH21 7JN up to High BH21 7JU up to High BH21 7LX up to High BH21 1AA up to Medium BH21 1AB up to Medium BH21 1AD up to Medium BH21 1AF up to Medium BH21 1AP up to Medium BH21 1AS up to Medium BH21 1DS up to Medium BH21 1DT up to Medium BH21 1GR up to Medium BH21 1GT up to Medium BH21 1HN up to Medium BH21 1LD up to Medium BH21 1PL up to Medium BH21 1QA up to Medium BH21 1QB up to Medium BH21 1QE up to Medium BH21 1QQ up to Medium BH21 1QX up to Medium BH21 1RA up to Medium BH21 1XA up to Medium BH21 3AD up to Medium BH21 3AE up to Medium BH21 3AR up to Medium BH21 3BS up to Medium BH21 3YH up to Medium BH21 4BA up to Medium BH21 4BJ up to Medium BH21 4BL up to Medium BH21 4BN up to Medium BH21 4BP up to Medium BH21 4BU up to Medium BH21 4BW up to Medium BH21 4EJ up to Medium BH21 5AY up to Medium BH21 5DU up to Medium BH21 5HZ up to Medium BH21 5NL up to Medium BH21 5PP up to Medium BH21 5PR up to Medium BH21 5PT up to Medium BH21 5PU up to Medium BH21 5QD up to Medium BH21 7DA up to Medium BH21 7JH up to Medium BH21 7JX up to Medium BH21 1AE up to Low BH21 1AG up to Low BH21 1AJ up to Low BH21 1AN up to Low BH21 1AQ up to Low BH21 1AU up to Low BH21 1BE up to Low BH21 1BG up to Low BH21 1BJ up to Low BH21 1BL up to Low BH21 1BN up to Low BH21 1BQ up to Low BH21 1BS up to Low BH21 1BT up to Low BH21 1BW up to Low BH21 1BX up to Low BH21 1DA up to Low BH21 1DY up to Low BH21 1DZ up to Low BH21 1EA up to Low BH21 1EB up to Low BH21 1ED up to Low BH21 1EF up to Low BH21 1EQ up to Low BH21 1GF up to Low BH21 1GH up to Low BH21 1GN up to Low BH21 1GP up to Low BH21 1HF up to Low BH21 1HG up to Low BH21 1HH up to Low BH21 1HP up to Low BH21 1HR up to Low BH21 1HS up to Low BH21 1HT up to Low BH21 1HU up to Low BH21 1HY up to Low BH21 1JA up to Low BH21 1JE up to Low BH21 1JH up to Low BH21 1JJ up to Low BH21 1LB up to Low BH21 1LE up to Low BH21 1LG up to Low BH21 1LJ up to Low BH21 1LP up to Low BH21 1LQ up to Low BH21 1LS up to Low BH21 1LT up to Low BH21 1LU up to Low BH21 1LY up to Low BH21 1NF up to Low BH21 1PD up to Low BH21 1PE up to Low BH21 1PF up to Low BH21 1PQ up to Low BH21 1PS up to Low BH21 1PT up to Low BH21 1PU up to Low BH21 1PW up to Low BH21 1PZ up to Low BH21 1QD up to Low BH21 1QH up to Low BH21 1QR up to Low BH21 1QY up to Low BH21 1RB up to Low BH21 1RD up to Low BH21 1RE up to Low BH21 1RF up to Low BH21 1RH up to Low BH21 1RQ up to Low BH21 1UW up to Low BH21 1WU up to Low BH21 1WW up to Low BH21 2AA up to Low BH21 2AB up to Low BH21 2AD up to Low BH21 2AE up to Low BH21 2AF up to Low BH21 2AG up to Low BH21 2AH up to Low BH21 2AJ up to Low BH21 2AL up to Low BH21 2AN up to Low BH21 2AP up to Low BH21 2AQ up to Low BH21 2AR up to Low BH21 2AS up to Low BH21 2AT up to Low BH21 2AW up to Low BH21 2AX up to Low BH21 2AY up to Low BH21 2AZ up to Low BH21 2BA up to Low BH21 2BB up to Low BH21 2BD up to Low BH21 2BE up to Low BH21 2BG up to Low BH21 2BH up to Low BH21 2BJ up to Low BH21 2BL up to Low BH21 2BN up to Low BH21 2BP up to Low BH21 2BQ up to Low BH21 2BT up to Low BH21 2BU up to Low BH21 2BW up to Low BH21 2BX up to Low BH21 2BY up to Low BH21 2BZ up to Low BH21 2DA up to Low BH21 2DB up to Low BH21 2DD up to Low BH21 2DF up to Low BH21 2DR up to Low BH21 2DW up to Low BH21 2EL up to Low BH21 2EP up to Low BH21 2ER up to Low BH21 2EU up to Low BH21 2EW up to Low BH21 2FA up to Low BH21 2FB up to Low BH21 2FD up to Low BH21 2FE up to Low BH21 2FF up to Low BH21 2FG up to Low BH21 2FH up to Low BH21 2FL up to Low BH21 2FR up to Low BH21 2FS up to Low BH21 2FT up to Low BH21 2FW up to Low BH21 2GA up to Low BH21 2GF up to Low BH21 2GH up to Low BH21 2GJ up to Low BH21 2GL up to Low BH21 2JJ up to Low BH21 2JL up to Low BH21 2TS up to Low BH21 3AS up to Low BH21 3RG up to Low BH21 3RJ up to Low BH21 3RQ up to Low BH21 4AT up to Low BH21 4AU up to Low BH21 4AY up to Low BH21 4AZ up to Low BH21 4BG up to Low BH21 4BS up to Low BH21 4DD up to Low BH21 4DE up to Low BH21 4ER up to Low BH21 5AG up to Low BH21 5NH up to Low BH21 5NP up to Low BH21 5PS up to Low BH21 5QA up to Low BH21 5QB up to Low BH21 6RS up to Low BH21 6SZ up to Low BH21 7LP up to Low BH21 7LR up to Low BH21 7LU up to Low BH21 8AB up to Low BH21 1UR up to Very low BH21 4BH up to Very low

Rivers and flooding history near BH21

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

Walford Mill on the River Allen — 0.8 km away, highest on record 1.11m
Wimborne on the River Stour — 2.5 km away, highest on record 2.00m
Badbury Rings on the Groundwater Level — 4.7 km away, highest on record 42.60m
Sturminster Marshall Maggs Bridge on the River Winterbourne — 7.2 km away, highest on record 1.79m

256 official flood warnings and alerts have been raised within ~10 km of the district's centre since 2006 (99 at warning level or above), most recently 2 March 2026. Warnings cover flood areas, not individual addresses.

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

Wimborne Oct 2021 (2021) — about 2 km from the centre
Flood Extents_Winter 2013 to 2014 (2014) — about 7.7 km from the centre
Wimborne Minster_Winter 2013 to 2014 (2014) — about 3.2 km from the centre
Wimborne Minster_Winter 2013 to 2014 (2014) — about 1 km from the centre

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

🏠 Buying or renting in BH21? 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

BH20 BH22 BH19 BH23 BH24 BH17 BH25 BH16

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.