Does SG12 flood?

Yes — parts of the SG12 district carry real flood risk: 78 of its 198 at-risk postcodes reach the Environment Agency's High likelihood band. The SG12 postcode district covers Great Amwell & Stansteads, close to Ware, Wareside, Wadesmill, and surrounding villages in parts of Hertfordshire and Essex.

198 postcodes in the SG12 district appear in the Environment Agency's rivers-and-sea flood-risk dataset — worst bands: 78 high, 17 medium, 102 low, 1 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 SG12 postcodes are at risk?

SG12 0AA up to High SG12 0AQ up to High SG12 0BP up to High SG12 0BW up to High SG12 0DA up to High SG12 0DE up to High SG12 0ET up to High SG12 0GF up to High SG12 0GW up to High SG12 0HU up to High SG12 0JB up to High SG12 0PU up to High SG12 0SQ up to High SG12 0TD up to High SG12 0TZ up to High SG12 0UE up to High SG12 0XT up to High SG12 7AW up to High SG12 7QX up to High SG12 7QY up to High SG12 7RH up to High SG12 7RJ up to High SG12 8AF up to High SG12 8BY up to High SG12 8BZ up to High SG12 8DE up to High SG12 8DG up to High SG12 8DR up to High SG12 8DT up to High SG12 8DU up to High SG12 8DW up to High SG12 8DX up to High SG12 8DY up to High SG12 8DZ up to High SG12 8EA up to High SG12 8EB up to High SG12 8EF up to High SG12 8EL up to High SG12 8EQ up to High SG12 8ET up to High SG12 8EU up to High SG12 8EZ up to High SG12 8FB up to High SG12 8GA up to High SG12 8HA up to High SG12 8HD up to High SG12 8HH up to High SG12 8HP up to High SG12 8HQ up to High SG12 8JS up to High SG12 8JY up to High SG12 8LD up to High SG12 8LL up to High SG12 8LN up to High SG12 8LQ up to High SG12 8LZ up to High SG12 8QP up to High SG12 8QT up to High SG12 8SX up to High SG12 8TX up to High SG12 8XH up to High SG12 9DB up to High SG12 9DH up to High SG12 9DX up to High SG12 9DY up to High SG12 9DZ up to High SG12 9FW up to High SG12 9HP up to High SG12 9HS up to High SG12 9HT up to High SG12 9HU up to High SG12 9HW up to High SG12 9HX up to High SG12 9HY up to High SG12 9LH up to High SG12 9SS up to High SG12 9SY up to High SG12 9UT up to High SG12 0AD up to Medium SG12 0BL up to Medium SG12 0JW up to Medium SG12 0LN up to Medium SG12 0RA up to Medium SG12 0RD up to Medium SG12 0XS up to Medium SG12 7RP up to Medium SG12 8AJ up to Medium SG12 8AL up to Medium SG12 8AP up to Medium SG12 8AS up to Medium SG12 8AT up to Medium SG12 9EJ up to Medium SG12 9FN up to Medium SG12 9FP up to Medium SG12 9PY up to Medium SG12 0BS up to Low SG12 0DH up to Low SG12 0ES up to Low SG12 0GP up to Low SG12 0GT up to Low SG12 0HY up to Low SG12 0JP up to Low SG12 0LH up to Low SG12 0LL up to Low SG12 0NU up to Low SG12 0PY up to Low SG12 0PZ up to Low SG12 0SY up to Low SG12 0SZ up to Low SG12 0TA up to Low SG12 0TE up to Low SG12 0TH up to Low SG12 0TJ up to Low SG12 0TL up to Low SG12 0TN up to Low SG12 7AA up to Low SG12 7AB up to Low SG12 7AF up to Low SG12 7AG up to Low SG12 7AH up to Low SG12 7AJ up to Low SG12 7AL up to Low SG12 7AN up to Low SG12 7AQ up to Low SG12 7AR up to Low SG12 7BP up to Low SG12 7BW up to Low SG12 7EA up to Low SG12 7EG up to Low SG12 7EQ up to Low SG12 7QN up to Low SG12 7QQ up to Low SG12 8AA up to Low SG12 8AB up to Low SG12 8AD up to Low SG12 8AE up to Low SG12 8AG up to Low SG12 8AH up to Low SG12 8AQ up to Low SG12 8AW up to Low SG12 8BU up to Low SG12 8EE up to Low SG12 8EX up to Low SG12 8HG up to Low SG12 8HL up to Low SG12 8JL up to Low SG12 8JN up to Low SG12 8JW up to Low SG12 8JX up to Low SG12 8TU up to Low SG12 8TY up to Low SG12 8TZ up to Low SG12 8UZ up to Low SG12 9AD up to Low SG12 9AE up to Low SG12 9AL up to Low SG12 9AP up to Low SG12 9AR up to Low SG12 9BA up to Low SG12 9BD up to Low SG12 9BF up to Low SG12 9BP up to Low SG12 9BS up to Low SG12 9BW up to Low SG12 9BX up to Low SG12 9DD up to Low SG12 9DN up to Low SG12 9DW up to Low SG12 9EE up to Low SG12 9FA up to Low SG12 9FD up to Low SG12 9FE up to Low SG12 9FF up to Low SG12 9FG up to Low SG12 9FH up to Low SG12 9FJ up to Low SG12 9FQ up to Low SG12 9FT up to Low SG12 9JE up to Low SG12 9LP up to Low SG12 9LW up to Low SG12 9NZ up to Low SG12 9PL up to Low SG12 9PT up to Low SG12 9PU up to Low SG12 9PZ up to Low SG12 9QB up to Low SG12 9QD up to Low SG12 9QF up to Low SG12 9QH up to Low SG12 9QL up to Low SG12 9QN up to Low SG12 9QP up to Low SG12 9QQ up to Low SG12 9UN up to Low SG12 9WR up to Low SG12 9XL up to Low SG12 9QS up to Very low

Rivers and flooding history near SG12

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

77 official flood warnings and alerts have been raised within ~10 km of the district's centre since 2006 (11 at warning level or above), most recently 15 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 SG12? 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

SG11 SG13 SG10 SG14 SG15 SG9 SG16 SG8

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.