Does N20 flood?

Yes — parts of the N20 district carry real flood risk: 1 of its 1 at-risk postcodes reach the Environment Agency's High likelihood band. The N20 postcode district sits close to Totteridge, Cockfosters, Southgate and surrounding villages in parts of England and Hertfordshire.

1 postcode in the N20 district appear in the Environment Agency's rivers-and-sea flood-risk dataset — worst bands: 1 high. 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 N20 postcodes are at risk?

N20 8QG up to High

Rivers and flooding history near N20

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

Whetstone on the Dollis Brook — 0.8 km away, highest on record 1.07m
North Finchley on the Dollis Brook — 1.8 km away, highest on record 2.06m
New Barnet on the Pymmes Brook — 2.5 km away, highest on record 1.11m
Powys Lane on the Pymmes Brook — 4.5 km away, highest on record 2.05m

230 official flood warnings and alerts have been raised within ~10 km of the district's centre since 2006 (13 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):

September 1992 flooding — about 9.8 km from the centre
December 1981 flooding — about 1.8 km from the centre
July 1980 flooding — about 2.5 km from the centre

🏠 Buying or renting in N20? 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

N21 N18 N22 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.