Crosby (Sefton) Flood Risk
Crosby (Sefton) has no mapped rivers-and-sea flood risk: neither the national risk assessment nor the planning Flood Zone map covers it. That is not a statement that Crosby (Sefton) cannot flood — this figure covers rivers and the sea only, and surface water flooding is not included. The nearest gauge is 4.8 km away.
Crosby (Sefton) has 49,849 residents and 23,792 homes. Ranked equal 3078 of 7,114 — the places where the national risk assessment maps no rivers-and-sea exposure for any home, so the position is a tie rather than a low score.
What Is The River Level Near Crosby (Sefton) Right Now?
Read from the Environment Agency flood-monitoring feed at 20 Sept, 14:34 UTC. The highest level on record here is 2.59 m , reached on 1 January 2025.
What Does Crosby (Sefton)'s Flood Risk Classification Mean?
0% of postcodes in Crosby (Sefton) sit in Flood Zone 3, the planning band for land with a 1% or greater annual chance of river flooding or 0.5% or greater of sea flooding — and the map that draws it deliberately ignores flood defences.
The flood risk band for rivers and the sea is not mapped here, which means the national assessment finds no rivers-and-sea exposure for Crosby (Sefton)'s homes rather than a low amount of it. That is a statement about rivers and the sea only: surface water flooding is not included, and it is the larger source nationally.
Which Postcode Districts Cover Crosby (Sefton)?
Each district below is one postcode district that falls inside Crosby (Sefton). The band is the one shared by most of that district's postcodes, so it describes the district rather than a single street — enter a full postcode in the checker for one address. A district can cover more than one town, and the district pages linked from the checker are keyed to the town that holds most of its postcodes.
| Postcode district | Postcodes here | Rivers and sea band | Surface water addresses |
|---|---|---|---|
| L23 | 651 | High | 6,018 |
| L22 | 268 | High | 3,343 |
| L21 | 146 | High | 1,130 |
| L20 | 8 | High | 180 |
What Else Is Near Crosby (Sefton)?
Other places on the Dovers Brook, nearest to Crosby (Sefton) first.