Greenisland Flood Risk
Greenisland 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 Greenisland cannot flood — this figure covers rivers and the sea only, and surface water flooding is not included.
Greenisland has 5,486 residents and 1 homes. Ranked equal 96 of 527 — 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.
Read this before relying on these figures. Northern Ireland's own flood maps are not published under an open licence, so the band above is modelled, not DfI's official mapping. The model is undefended — it does not account for flood defences, so a defended town can read as more exposed than DfI's own map shows — and it covers rivers only. For a property-level answer, use Flood Maps NI.
What Does Greenisland's Flood Risk Classification Mean?
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 Greenisland'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.
Flood Zone versus flood risk band: the full comparison · What the Flood Zones mean
Which Postcode Districts Cover Greenisland?
Each district below is one postcode district that falls inside Greenisland. 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: every district here overlaps another place, so the checker may name a neighbouring town for some of these postcodes.
| Postcode district | Postcodes here | Rivers and sea band | Surface water addresses |
|---|---|---|---|
| BT38 | 114 | Not mapped — no rivers-and-sea band covers this district | not published for this district |
"Not mapped" is not "no risk". It means no rivers-and-sea band covers that district in the source — surface water can still flood it, and both Camden and Islington flooded from surface water in July 2021 while carrying no mapped rivers-and-sea band.