Flood is excluded from the master property policy, and NFIP's per-building limit rarely covers a full loss.

Flood is excluded from the master property policy everywhere in the country, not just in coastal or high-risk zones. That exclusion applies to water however it arrives, storm surge pushed inland by a coastal storm, a river or lake overflowing its banks, or heavy rainfall that overwhelms drainage before it can be absorbed. Whatever the source, if the water originates outside the building and rises to affect two or more acres or two or more properties, it is treated as flood, and flood is a peril the master policy was never priced to cover.

Because that exclusion is universal, flood coverage only exists on an association's program if someone specifically bought it, through the National Flood Insurance Program (NFIP), a private flood carrier, or both layered together. Boards in coastal Florida and Gulf Coast communities encounter this most often, but any association near a floodplain, river, or low-lying drainage area carries the same exposure and the same need for a separate purchase.

The NFIP limit was never sized for a mid-rise or high-rise building

The NFIP writes flood coverage on a per-building basis with a fixed maximum limit, a cap that was designed around single-family homes and small structures, not multi-story condo or HOA buildings with replacement values that can run into the tens of millions of dollars. For a garden-style or single-family HOA, the NFIP limit may come reasonably close to covering a full loss. For a mid-rise or high-rise condo, the gap between the NFIP limit and the building's actual replacement cost can be enormous, leaving the association responsible for the difference out of reserves or a special assessment after a flood event.

This is exactly the gap the private and excess flood market exists to close. A private flood policy can either replace NFIP coverage outright or, more commonly for larger buildings, sit as an excess layer above the NFIP limit, extending total flood limits up toward the building's actual replacement value. Boards that have only ever carried NFIP coverage, without ever checking it against replacement cost, are among the most commonly underinsured for flood of any peril on this site.

FEMA flood zone and elevation drive both the exposure and the price

Two data points determine most of a building's flood underwriting: its FEMA flood zone designation and its elevation relative to the base flood elevation for that zone. A building mapped into a high-risk Special Flood Hazard Area, and sitting at or below base flood elevation, faces materially higher flood premiums and tighter terms than an otherwise identical building a few blocks inland or a few feet higher in elevation. An elevation certificate, when the association has one, is often the single document that most affects flood pricing.

Storm surge and inland freshwater flooding are both governed by this same zone-and-elevation framework, even though they originate differently. A coastal building faces storm surge risk tied to its proximity to open water and its ground-floor elevation, while a building along a river or in a low-lying drainage basin faces inland flood risk tied to floodplain mapping and stormwater capacity. A single community can face both if it sits near a coastline that also drains a nearby watershed, which is common along much of the Gulf Coast and Florida's coastal counties.