What does flood zone A mean?
Zone A is a high-risk flood area (1% annual chance) where FEMA has not calculated a base flood elevation. It is usually mapped with an approximate study.
In more detail
Zone A areas carry the same 1% annual-chance flood risk as AE. The difference is detail: with no base flood elevation on the map, there is no official water height to compare a building to.
Without that number, insurers and local officials may need an engineer to estimate one. That can make building permits and insurance quotes slower and sometimes more expensive.
What it means when you buy
Treat zone A like AE for risk and lender requirements. Budget for an elevation certificate, and possibly an engineer's base flood elevation, before you rely on an insurance quote.
How the free flood check shows it
The free flood check flags zone A separately from AE, because the missing elevation changes what you need to ask for next.
Check the flood zone for an address, free
Enter any US address to see its FEMA flood zone and a map of the flood areas around it. Add your email to see which buildings sit in the flood zone and the risk numbers.