Does L21 flood?

Yes — parts of the L21 district carry real flood risk: 1 of its 1 at-risk postcodes reach the Environment Agency's High likelihood band. The L21 postcode district covers Church, close to Bootle, Sefton, Aintree, and surrounding villages in parts of Liverpool City Region and Lancashire.

1 postcode in the L21 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 L21 postcodes are at risk?

L21 1JD up to High

Rivers and flooding history near L21

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

Dovers Bridge on the Dovers Brook — 5.9 km away, highest on record 2.59m
Kirkby on the River Alt — 6.9 km away, highest on record 2.22m
Davis Road on the River Birket — 7.6 km away, highest on record 3.27m
Acton Lane on the Arrowe Brook — 10.4 km away, highest on record 1.61m

224 official flood warnings and alerts have been raised within ~10 km of the district's centre since 2006 (66 at warning level or above), most recently 20 August 2026. Warnings cover flood areas, not individual addresses.

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

ea013_051213_NewBrighton (2013) — about 3.5 km from the centre

Records, not floods: no outline on the record is not evidence a place has not flooded.

🏠 Buying or renting in L21? 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

L20 L19 L24 L17 L25 L16 L26 L27

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.