Does SL8 flood?

Yes — parts of the SL8 district carry real flood risk: 27 of its 81 at-risk postcodes reach the Environment Agency's High likelihood band. The SL8 postcode district covers Flackwell Heath & The Wooburns, Chiltern Villages, Bisham & Cookham, close to Bourne End, Cookham, Marlow, and surrounding villages in parts of Buckinghamshire and Windsor and Maidenhead.

81 postcodes in the SL8 district appear in the Environment Agency's rivers-and-sea flood-risk dataset — worst bands: 27 high, 24 medium, 26 low, 4 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 SL8 postcodes are at risk?

SL8 5AL up to High SL8 5AP up to High SL8 5AW up to High SL8 5DH up to High SL8 5DP up to High SL8 5DY up to High SL8 5DZ up to High SL8 5EA up to High SL8 5EB up to High SL8 5ED up to High SL8 5EE up to High SL8 5GA up to High SL8 5HR up to High SL8 5HS up to High SL8 5PS up to High SL8 5PT up to High SL8 5QS up to High SL8 5QT up to High SL8 5QU up to High SL8 5RE up to High SL8 5RF up to High SL8 5RG up to High SL8 5RH up to High SL8 5RP up to High SL8 5RR up to High SL8 5RW up to High SL8 5XP up to High SL8 5AG up to Medium SL8 5AS up to Medium SL8 5AY up to Medium SL8 5BE up to Medium SL8 5DX up to Medium SL8 5FF up to Medium SL8 5FN up to Medium SL8 5JN up to Medium SL8 5QF up to Medium SL8 5QJ up to Medium SL8 5QL up to Medium SL8 5QN up to Medium SL8 5QP up to Medium SL8 5QR up to Medium SL8 5QY up to Medium SL8 5QZ up to Medium SL8 5RS up to Medium SL8 5RU up to Medium SL8 5SA up to Medium SL8 5SB up to Medium SL8 5SE up to Medium SL8 5SJ up to Medium SL8 5UT up to Medium SL8 5YS up to Medium SL8 5AA up to Low SL8 5AE up to Low SL8 5AR up to Low SL8 5AX up to Low SL8 5AZ up to Low SL8 5BG up to Low SL8 5DG up to Low SL8 5DL up to Low SL8 5DN up to Low SL8 5DQ up to Low SL8 5DS up to Low SL8 5DW up to Low SL8 5EG up to Low SL8 5EQ up to Low SL8 5GZ up to Low SL8 5HJ up to Low SL8 5HP up to Low SL8 5RD up to Low SL8 5RY up to Low SL8 5SH up to Low SL8 5SL up to Low SL8 5SN up to Low SL8 5SS up to Low SL8 5SX up to Low SL8 5SY up to Low SL8 5TB up to Low SL8 5DT up to Very low SL8 5EF up to Very low SL8 5EH up to Very low SL8 5RN up to Very low

Rivers and flooding history near SL8

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

96 official flood warnings and alerts have been raised within ~10 km of the district's centre since 2006 (24 at warning level or above), most recently 27 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 SL8? 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

SL7 SL9 SL6 SL5 SL4 SL3 SL2 SL1

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.