Does N21 flood?

Yes — parts of the N21 district carry real flood risk: 7 of its 34 at-risk postcodes reach the Environment Agency's High likelihood band. The N21 postcode district covers Grange Park, Winchmore Hill, Bush Hill Park, Southgate, close to Edmonton, Cockfosters, Enfield Wash, and surrounding villages in parts of England and Hertfordshire.

34 postcodes in the N21 district appear in the Environment Agency's rivers-and-sea flood-risk dataset — worst bands: 7 high, 7 medium, 14 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 N21 postcodes are at risk?

N21 1LU up to High N21 2BG up to High N21 2EA up to High N21 2ED up to High N21 2ET up to High N21 2LX up to High N21 2NH up to High N21 1AS up to Medium N21 1LX up to Medium N21 1LY up to Medium N21 2EE up to Medium N21 2HB up to Medium N21 2HE up to Medium N21 2LT up to Medium N21 1AJ up to Low N21 1AN up to Low N21 1AP up to Low N21 1AR up to Low N21 1DD up to Low N21 1EL up to Low N21 1JA up to Low N21 1LN up to Low N21 2AT up to Low N21 2BN up to Low N21 2ES up to Low N21 2EY up to Low N21 2HA up to Low N21 2LU up to Low N21 1DF up to Very low N21 1RF up to Very low N21 2AN up to Very low N21 2AS up to Very low N21 2BD up to Very low N21 2EB up to Very low

Rivers and flooding history near N21

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

Enfield, The Chine on the Salmon Brook — 0.4 km away, highest on record 2.42m
Edmonton Green on the Salmon Brook — 2.9 km away, highest on record 1.19m
Powys Lane on the Pymmes Brook — 3.3 km away, highest on record 2.05m
Edmonton, Silver Street on the Pymmes Brook — 3.5 km away, highest on record 1.45m

143 official flood warnings and alerts have been raised within ~10 km of the district's centre since 2006 (4 at warning level or above), most recently 27 August 2026. Warnings cover flood areas, not individual addresses.

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

January 2021 flooding — about 0.4 km from the centre
June 2012 flooding — about 1.6 km from the centre
December 2000 flooding — about 3.8 km from the centre
December 2000 flooding — about 0.4 km from the centre

🏠 Buying or renting in N21? 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

N20 N22 N18 N17 N16 N15 N14 N13

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.