Executive Summary

If your lender currently requires flood insurance, do not ignore that requirement simply because your survey says Flood Zone X. Start by getting the flood determination your lender is actually using. Then compare it with the current FEMA flood map, your survey, available elevation information, and the location of the structure securing the loan.

A survey showing Zone X does not automatically override a lender's Flood Zone AE determination. However, a discrepancy may be worth investigating. Depending on the property's elevation and other factors, a Letter of Map Amendment (LOMA) or Letter of Map Revision Based on Fill (LOMR-F) may be appropriate.

This issue is personal for me. My own property was identified as Flood Zone AE when it should have been Zone X, and the situation cost me thousands of dollars. That experience is one of the reasons I encourage homeowners not to simply assume that conflicting flood-zone information will resolve itself.

Why Can My Survey Say Zone X While My Lender Says Flood Zone AE?

1. Your survey may contain older flood-map information

Flood maps change.

If your survey was completed before the current FEMA map became effective, the flood-zone information printed on the survey may not reflect the map that is effective today.

That is why two of the first questions to ask are:

• When was the survey completed?
• When did the current FEMA flood map become effective?

Do not assume the flood-zone notation on an older survey is based on the current effective FEMA map.

2. Your lender may be using a different flood determination

Your lender is not necessarily relying on the flood-zone notation printed on your survey.

Mortgage lenders may use a flood-hazard determination produced as part of the lending and compliance process. So when a homeowner tells us, “My bank says I am in AE,” one of the first things we want to understand is what the bank is actually using to make that determination.

Before arguing that the survey is right and the lender is wrong, get the lender's actual flood determination.

3. The flood-zone boundary may be extremely close to your house

Flood mapping can become more complicated than looking at a colored parcel on a map.

A flood-zone boundary can run very close to a structure. Mapping systems, parcel layers, and the location of the actual building can make a property appear straightforward when it is not.

In situations like these, the more useful question is often not simply, “What flood zone is my lot in?”

Instead, ask:

What flood zone applies to the structure securing my loan?

4. Different structures on the same property can be in different flood zones

Flood-zone boundaries do not have to follow property lines.

That means a primary residence may appear in one flood zone while another structure, such as a detached garage, pool house, or accessory building, appears in another.

This is another reason simply asking, “What flood zone is my property in?” may not be specific enough.

Does My Survey Override My Lender's Flood Determination?

No, not automatically.

This is one of the biggest misunderstandings homeowners can have when a lender's flood determination conflicts with a survey.

A survey can contain extremely valuable information about a property's location, boundaries, elevations, and flood-zone information. But the process is not automatically:

Survey says Zone X → lender is wrong → flood insurance requirement disappears.

For the immediate mortgage issue, you first need to understand the flood determination the lender is using.

Then you can investigate a separate question:

Does the available evidence support asking FEMA to amend or revise the flood-zone determination for the structure or property?

Those are related issues, but they are not the same issue.

What Should I Look at on My Survey?

Do not focus only on the words “Zone AE” or “Zone X.”

Depending on the property, useful information may include:

• The location of the actual structure
• The mapped flood-zone boundary
• The date the survey was completed
• The effective date of the current FEMA map
• Available elevation information
• Whether an Elevation Certificate exists
• The applicable Base Flood Elevation, or BFE
• The structure's Lowest Adjacent Grade, or LAG

Those last two measurements can become especially important when evaluating whether a property may qualify for a FEMA Letter of Map Amendment or Letter of Map Revision Based on Fill.

FEMA explains that the BFE can be compared with the Lowest Adjacent Grade, which is generally the elevation of the lowest ground touching a building. When the applicable LAG is at or above the BFE, the building may be considered outside the Special Flood Hazard Area for purposes of a qualifying LOMA or LOMR-F determination.

Read FEMA's guidance on BFE, Lowest Adjacent Grade, LOMAs, and LOMR-Fs.

What If My Elevation Certificate Also Says Zone X?

Do not assume the Elevation Certificate by itself has changed your flood zone or eliminated the lender's insurance requirement.

FEMA describes the Elevation Certificate as an important administrative tool of the National Flood Insurance Program. It can provide elevation information and can support a request for a LOMA or LOMR-F.

But FEMA also explicitly states that using an Elevation Certificate does not itself waive the flood-insurance purchase requirement.

In other words, getting the Elevation Certificate may be an important part of the process, but it may not be the final step.

Review FEMA's official Elevation Certificate guidance.

What Should You Do When Your Lender Says AE but Your Survey Says X?

Step 1: Get the lender's flood determination

Find out exactly what document or determination triggered the flood-insurance requirement.

You cannot properly investigate the disagreement until you know what your lender is relying on.

Step 2: Review the property information

Depending on the situation, that review may include:

• The current FEMA flood map
• The FEMA map effective date
• Your survey
• An Elevation Certificate, if one exists
• The location of the structure
• The applicable Base Flood Elevation
• The Lowest Adjacent Grade

Step 3: Decide whether pursuing a FEMA map change makes sense

Before spending additional money, look at whether the evidence suggests the property or structure is a reasonable candidate for further review.

Depending on the facts, that may involve investigating a Letter of Map Amendment or Letter of Map Revision Based on Fill.

What Makes a Property a Potential LOMA Candidate?

One of the most important relationships to examine is:

Base Flood Elevation vs. Lowest Adjacent Grade.

FEMA states that a building's Lowest Adjacent Grade is the elevation of the lowest ground touching the building. For a LOMA or LOMR-F review, FEMA compares that elevation with the applicable Base Flood Elevation.

If the LAG is at or above the BFE, FEMA guidance says the building may be considered outside the Special Flood Hazard Area.

Other issues can also matter, including:

• Whether the structure is in a regulatory floodway
• Whether fill has been used
• What certified elevation information is available
• Whether the effective flood map has changed
• Whether usable BFE information exists
• Other site-specific complications

This is why “just go buy an Elevation Certificate” is not always the most useful first piece of advice.

LOMA vs. LOMR-F: What's the Difference?

FEMA distinguishes these two processes based largely on whether the elevation is natural or the result of fill.

See FEMA's explanation of LOMA and LOMR-F eligibility.

Should I Buy Flood Insurance While My Flood Zone Is Being Reviewed?

If your lender currently requires flood insurance, do not simply ignore the requirement while you investigate the discrepancy.

The immediate mortgage requirement and the longer-term flood-zone review can happen at the same time.

You may need to satisfy the lender's current insurance requirement while separately investigating whether the flood-zone determination can legitimately be changed.

Do not let the dispute itself create an avoidable closing or loan problem.

What Happens If FEMA Approves My LOMA or LOMR-F?

A successful LOMA or LOMR-F can provide an official FEMA determination affecting whether a qualifying structure or property is considered part of the Special Flood Hazard Area.

FEMA explains that an Elevation Certificate alone does not waive the federal flood-insurance purchase requirement. A FEMA-issued LOMA or LOMR-F is the type of determination that can remove the federal mandate associated with the mapped designation.

There is an important catch:

Your lender may still choose to require flood insurance even after FEMA issues a LOMA or LOMR-F.

FEMA states this directly in its Elevation Certificate guidance.

See FEMA's guidance on lender requirements after a LOMA or LOMR-F.

There is also a difference between changing an insurance requirement and changing the actual flood risk.

Changing the requirement does not change the weather or eliminate the possibility of flooding.

This Happened to Me: My Property Was Listed as AE When It Should Have Been X

I do not talk about flood-zone discrepancies only because I work with flood insurance. I experienced one on my own property.

My property was identified as Flood Zone AE when it should have been Flood Zone X, and the situation cost me thousands of dollars.

That experience changed how seriously I take situations where a lender, survey, flood map, and other property information appear to disagree.

It is also why I do not recommend simply accepting one document at face value or assuming the discrepancy will fix itself.

Start with the lender's determination. Then review the current map and the property-specific evidence before deciding what, if anything, should happen next.

What Is the Biggest Mistake Homeowners Make When Their Survey Says Zone X?

One of the biggest mistakes is stopping at the survey or Elevation Certificate.

A more complete process can look like this:

1. Your lender says Flood Zone AE.
2. You obtain the lender's flood determination.
3. You review the current FEMA map.
4. You review the survey and available elevation information.
5. You determine whether there is a legitimate discrepancy.
6. You determine whether a FEMA map-change process may apply.
7. You submit the appropriate documentation when warranted.
8. FEMA issues its determination.
9. You provide the determination to the lender.

An Elevation Certificate can be evidence in the process. It is not necessarily the end of the process.

FEMA provides specific application forms for property owners seeking a Letter of Map Amendment or related map change.

Review FEMA's Letter of Map Change application information.

Frequently Asked Questions

Why does my lender say Flood Zone AE when my survey says Zone X?

The documents may be based on different flood maps, effective dates, structure locations, or determinations. Start by obtaining the flood determination your lender is actually using and compare that with the current FEMA map and your property information.

Does my survey determine my flood zone?

A survey can provide valuable location and elevation information, but a flood-zone notation on a survey does not automatically amend FEMA's effective flood map or eliminate a lender's insurance requirement.

Does an Elevation Certificate change my flood zone?

No. FEMA says an Elevation Certificate can support a LOMA or LOMR-F request, but the certificate itself does not waive the federal flood-insurance purchase requirement.

What if my Lowest Adjacent Grade is above the Base Flood Elevation?

That can be an important factor when evaluating a potential LOMA or LOMR-F. FEMA guidance states that, for a building, the BFE is compared with the Lowest Adjacent Grade. If the LAG is at or above the BFE, the building may qualify to be considered outside the Special Flood Hazard Area.

Can my lender require flood insurance after FEMA approves a LOMA?

Yes. FEMA states that a lending institution may still choose to require flood insurance even after FEMA issues a LOMA or LOMR-F.

Your Lender Says AE. Your Survey Says X. What Should You Do Next?

If you are facing conflicting flood-zone information, you now know that the answer is not as simple as deciding that the survey must be right or that the lender must be right.

Start by getting the flood determination your lender is using. Then compare it with the current FEMA map and the property-specific evidence.

If the information suggests the structure may have been incorrectly included in a Special Flood Hazard Area, the next question is whether a formal FEMA map-change process such as a LOMA or LOMR-F is appropriate.

I take these situations seriously because I have dealt with one on my own property. Mine was identified as Flood Zone AE when it should have been Zone X, and it cost me thousands of dollars.

The goal is not to assume your lender is wrong. It is to understand exactly what determination is being used, review the evidence, and make an informed decision about what should happen next.