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Does DT5 flood?

Yes — parts of the DT5 district carry real flood risk: 20 of its 31 at-risk postcodes reach the Environment Agency's High likelihood band. The DT5 postcode district covers Portland, close to Weymouth, Bank Barrow, Upwey, and surrounding villages in Dorset.

31 postcodes in the DT5 district appear in the Environment Agency's rivers-and-sea flood-risk dataset — worst bands: 20 high, 3 medium, 2 low, 6 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).

Free preview first · full report £19

Which DT5 postcodes are at risk?

DT5 1AH up to High DT5 1AL up to High DT5 1AN up to High DT5 1AP up to High DT5 1AR up to High DT5 1AS up to High DT5 1AT up to High DT5 1AW up to High DT5 1AY up to High DT5 1AZ up to High DT5 1BG up to High DT5 1BJ up to High DT5 1DX up to High DT5 1FA up to High DT5 1FE up to High DT5 1FH up to High DT5 1LN up to High DT5 1PA up to High DT5 1SA up to High DT5 2JT up to High DT5 1BL up to Medium DT5 1PB up to Medium DT5 1PP up to Medium DT5 1BD up to Low DT5 1GB up to Low DT5 1FD up to Very low DT5 1FT up to Very low DT5 1FU up to Very low DT5 1GE up to Very low DT5 1JH up to Very low DT5 1PY up to Very low

Rivers and flooding history near DT5

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

265 official flood warnings and alerts have been raised within ~10 km of the district's centre since 2006 (189 at warning level or above), most recently 18 February 2026. Warnings cover flood areas, not individual addresses.

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

🏠 Buying or renting in DT5? 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

DT4 DT6 DT3 DT7 DT2 DT8 DT1 DT9

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.