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Does SL3 flood?

Yes — parts of the SL3 district carry real flood risk: 124 of its 296 at-risk postcodes reach the Environment Agency's High likelihood band. The SL3 postcode district covers Colnbrook & Poyle, Farnhams & Stoke Poges, Upton, close to Horton, Datchet, Old Windsor, and surrounding villages in parts of Greater London and Surrey.

296 postcodes in the SL3 district appear in the Environment Agency's rivers-and-sea flood-risk dataset — worst bands: 124 high, 46 medium, 62 low, 64 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 SL3 postcodes are at risk?

SL3 0AT up to High SL3 0ED up to High SL3 0JP up to High SL3 0JU up to High SL3 0JZ up to High SL3 0LU up to High SL3 0LX up to High SL3 0ND up to High SL3 0NF up to High SL3 0NG up to High SL3 0NP up to High SL3 0RL up to High SL3 6AE up to High SL3 6AN up to High SL3 6AP up to High SL3 6BS up to High SL3 6LF up to High SL3 6LH up to High SL3 6LL up to High SL3 6LN up to High SL3 6LX up to High SL3 6QA up to High SL3 6QD up to High SL3 6QE up to High SL3 6QJ up to High SL3 6QQ up to High SL3 7DJ up to High SL3 7FG up to High SL3 7FQ up to High SL3 7HN up to High SL3 7HW up to High SL3 7JL up to High SL3 7LT up to High SL3 7NA up to High SL3 7NB up to High SL3 7ND up to High SL3 7NT up to High SL3 8AB up to High SL3 9AE up to High SL3 9AG up to High SL3 9AH up to High SL3 9AL up to High SL3 9AN up to High SL3 9AP up to High SL3 9AQ up to High SL3 9AR up to High SL3 9AS up to High SL3 9AT up to High SL3 9AU up to High SL3 9AX up to High SL3 9AY up to High SL3 9BA up to High SL3 9BE up to High SL3 9BJ up to High SL3 9BP up to High SL3 9BS up to High SL3 9BY up to High SL3 9BZ up to High SL3 9DB up to High SL3 9DD up to High SL3 9DE up to High SL3 9DJ up to High SL3 9DL up to High SL3 9DN up to High SL3 9DR up to High SL3 9DS up to High SL3 9DT up to High SL3 9DU up to High SL3 9DW up to High SL3 9DX up to High SL3 9DY up to High SL3 9EA up to High SL3 9EG up to High SL3 9EH up to High SL3 9EJ up to High SL3 9EN up to High SL3 9ER up to High SL3 9EU up to High SL3 9EW up to High SL3 9EX up to High SL3 9EY up to High SL3 9EZ up to High SL3 9HA up to High SL3 9HD up to High SL3 9HE up to High SL3 9HG up to High SL3 9HH up to High SL3 9HJ up to High SL3 9HL up to High SL3 9HN up to High SL3 9HP up to High SL3 9HQ up to High SL3 9HR up to High SL3 9HS up to High SL3 9HT up to High SL3 9HW up to High SL3 9HX up to High SL3 9HY up to High SL3 9HZ up to High SL3 9JE up to High SL3 9JH up to High SL3 9JL up to High SL3 9JQ up to High SL3 9LB up to High SL3 9LD up to High SL3 9LL up to High SL3 9LS up to High SL3 9LT up to High SL3 9LU up to High SL3 9LX up to High SL3 9LY up to High SL3 9LZ up to High SL3 9NA up to High SL3 9ND up to High SL3 9NT up to High SL3 9PE up to High SL3 9PJ up to High SL3 9PR up to High SL3 9QT up to High SL3 9QU up to High SL3 9QX up to High SL3 9QY up to High SL3 9QZ up to High SL3 9RA up to High SL3 0AU up to Medium SL3 0HS up to Medium SL3 0JS up to Medium SL3 0NB up to Medium SL3 0PZ up to Medium SL3 0QA up to Medium SL3 0QB up to Medium SL3 0QD up to Medium SL3 0QF up to Medium SL3 0QW up to Medium SL3 6AR up to Medium SL3 6BU up to Medium SL3 6DH up to Medium SL3 6HJ up to Medium SL3 9AA up to Medium SL3 9AW up to Medium SL3 9BB up to Medium SL3 9BG up to Medium SL3 9BL up to Medium SL3 9BN up to Medium SL3 9BQ up to Medium SL3 9BR up to Medium SL3 9BW up to Medium SL3 9BX up to Medium SL3 9DH up to Medium SL3 9DQ up to Medium SL3 9EB up to Medium SL3 9ED up to Medium SL3 9EL up to Medium SL3 9EP up to Medium SL3 9EQ up to Medium SL3 9HB up to Medium SL3 9HU up to Medium SL3 9JA up to Medium SL3 9JB up to Medium SL3 9JD up to Medium SL3 9JJ up to Medium SL3 9JN up to Medium SL3 9LH up to Medium SL3 9LJ up to Medium SL3 9LR up to Medium SL3 9PG up to Medium SL3 9PQ up to Medium SL3 9PX up to Medium SL3 9QA up to Medium SL3 9RB up to Medium SL3 0AQ up to Low SL3 0EA up to Low SL3 0EN up to Low SL3 0HX up to Low SL3 0HY up to Low SL3 0HZ up to Low SL3 0JA up to Low SL3 0JT up to Low SL3 0LN up to Low SL3 0NJ up to Low SL3 0NN up to Low SL3 0NX up to Low SL3 0NY up to Low SL3 0NZ up to Low SL3 0PA up to Low SL3 0PB up to Low SL3 0PD up to Low SL3 0PP up to Low SL3 0PQ up to Low SL3 0PY up to Low SL3 0QE up to Low SL3 0QG up to Low SL3 0QH up to Low SL3 0QQ up to Low SL3 6BY up to Low SL3 6DD up to Low SL3 6EG up to Low SL3 6EY up to Low SL3 6HL up to Low SL3 6HN up to Low SL3 6LY up to Low SL3 6QB up to Low SL3 6QF up to Low SL3 6QG up to Low SL3 7DT up to Low SL3 7FX up to Low SL3 7HQ up to Low SL3 7JF up to Low SL3 7NQ up to Low SL3 9AF up to Low SL3 9AZ up to Low SL3 9BT up to Low SL3 9DA up to Low SL3 9EE up to Low SL3 9FA up to Low SL3 9FB up to Low SL3 9JP up to Low SL3 9JR up to Low SL3 9JZ up to Low SL3 9LA up to Low SL3 9LQ up to Low SL3 9NE up to Low SL3 9NF up to Low SL3 9NG up to Low SL3 9NH up to Low SL3 9NJ up to Low SL3 9NQ up to Low SL3 9PA up to Low SL3 9PB up to Low SL3 9PT up to Low SL3 9PW up to Low SL3 9QE up to Low SL3 0AA up to Very low SL3 0AE up to Very low SL3 0AH up to Very low SL3 0AL up to Very low SL3 0AP up to Very low SL3 0AR up to Very low SL3 0AW up to Very low SL3 0AX up to Very low SL3 0AY up to Very low SL3 0BH up to Very low SL3 0BL up to Very low SL3 0BN up to Very low SL3 0BS up to Very low SL3 0DB up to Very low SL3 0DG up to Very low SL3 0DP up to Very low SL3 0DQ up to Very low SL3 0EZ up to Very low SL3 0FJ up to Very low SL3 0HJ up to Very low SL3 0HQ up to Very low SL3 0HT up to Very low SL3 0JB up to Very low SL3 0JD up to Very low SL3 0JE up to Very low SL3 0JF up to Very low SL3 0JG up to Very low SL3 0JJ up to Very low SL3 0NU up to Very low SL3 0NW up to Very low SL3 0PR up to Very low SL3 0PS up to Very low SL3 0PT up to Very low SL3 0QT up to Very low SL3 0QU up to Very low SL3 0SB up to Very low SL3 0TW up to Very low SL3 7GE up to Very low SL3 7GF up to Very low SL3 7GG up to Very low SL3 7GL up to Very low SL3 7GN up to Very low SL3 7GQ up to Very low SL3 7GU up to Very low SL3 7GW up to Very low SL3 7HZ up to Very low SL3 7JB up to Very low SL3 7LU up to Very low SL3 7UG up to Very low SL3 7UN up to Very low SL3 7UR up to Very low SL3 9AB up to Very low SL3 9AD up to Very low SL3 9JF up to Very low SL3 9JS up to Very low SL3 9JT up to Very low SL3 9JW up to Very low SL3 9LE up to Very low SL3 9NU up to Very low SL3 9PD up to Very low SL3 9PH up to Very low SL3 9PP up to Very low SL3 9PY up to Very low SL3 9QD up to Very low

Rivers and flooding history near SL3

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

294 official flood warnings and alerts have been raised within ~10 km of the district's centre since 2006 (88 at warning level or above), most recently 15 March 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 SL3? 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

SL2 SL4 SL1 SL5 SL0 SL6 SL7 SL8

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.