Buying a Lake House in a Floodplain: What the Map Won't Tell You

Quick Summary

A lake house in a floodplain is not automatically a bad buy. The FEMA flood map shows which zone a lot sits in, but not whether the house has ever flooded or where the living area sits relative to the base flood elevation (BFE). Flood history and the elevation certificate answer those questions, and flood insurance is almost always available. Price follows risk: low-risk homes sell at a premium and higher-risk homes at a discount. Sellers who bring the elevation certificate, the flood history, and any existing flood policy to the table give buyers fewer reasons to walk.

A buyer pulls up a flood map, sees shading across a lakefront lot, and crosses the house off the list. Sometimes that is the right call. Often it is not. In this Dock Talk, recorded in April 2026, four of our agents took on the question we hear most about Central Texas waterfront: what floodplain am I in, and does it really matter? Yes, it matters, but the map is where your homework starts, not where it ends.

Should You Rule Out a Lake House in a Floodplain?

Not on the map alone. The episode opens on one of the homes on Lake Dunlap, walking up from the water. At the shoreline you are standing in the floodway. Partway up the hill you are in the 100-year floodplain. Near the house you are out of it. One lot, three designations.

The floodway is the channel plus the land beside it that has to stay open to carry floodwater, and it has the strictest building rules. The 100-year floodplain is land with a 1% chance of flooding in any given year. That is why "the lot is in the floodplain" and "the house is in the floodplain" are two different statements. Your dirt can be low while your living area sits above the BFE.

Why Does Flood History Matter More Than the Map?

Because the map is a line drawn over the land, and the land is not flat. Hunter Croan, who owns The Lakefront Group and grew up on Lake McQueeney, points to Terminal Loop Road, one of the most popular roads for homes on Lake McQueeney. Much of it is mapped as floodway, and buyers who check the map often write it off. Yet Hunter estimates fewer than half the homes on Terminal Loop flooded in October 1998, a flood GBRA says reached or exceeded 500-year levels in parts of the Guadalupe basin. The road has natural topography that the map does not show.

Treasure Island, also on Lake McQueeney, tells the same story. It is mapped as floodway, but some of its high ground stayed dry in 1998, including the home of the in-laws of Hagan Cohle, our buyer specialist, who was born and raised in New Braunfels.

The 1998 flood was so severe that a significant share of homes along the Guadalupe Lakes took water, so we call it the 1998 exception. Plenty of buyers tell us they will not consider a house that has flooded, except in 1998. Judging a property on that one storm, and ignoring every flood before and since, does not give you an accurate picture.

Flood control has also changed since then. The Dry Comal Creek Flood Retarding Structure, also called the Krueger Canyon Dam, was built in response to 1998 and dedicated in March 2013, according to the New Braunfels Herald-Zeitung. County officials estimated it would have cut the floodwater draining into New Braunfels in the June 2010 flood by about 20 percent. In Hunter's experience, the lakes we serve downstream of Dry Comal Creek have not had a 100-year flood since. That is not a promise, but it belongs in the history you weigh.

Online flood scores share the map's blind spot. Hagan had a client looking at a home on Klein Road on Lake Dunlap, where houses sit 25 to 30 feet above the lake, and Zillow's flood risk rating called it high risk. The rating counted the floodplain down by the water, not where the house stands. We cover online scores in more depth in Do Waterfront Homes Flood?

Can a Home Be in the Floodplain and Never Have Flooded?

Yes, and Lake Travis is the clearest example. Brooke LeMond, who has sold Lake Travis waterfront homes throughout her 20+ year career, explained that the 100-year flood level on the lake used to be 717 feet. A later Corps of Engineers study raised it to 722 feet, which is what today's FEMA map shows. Homes built above 717 feet were outside the floodplain when they went up and are technically inside it now. Yet the highest Lake Travis has ever reached is 710.44 feet, in December 1991, according to LCRA. Those homes have never taken lake water.

On Lake LBJ waterfront homes, the question Brooke and Billy hear most is about October 2018. The Llano River rose 35 feet in 24 hours, as KXAN reported, and many lakeside homes on Lake LBJ and Lake Marble Falls flooded. Whether a specific house took water then is a property-level question, and it is one of the first things we check.

Hunter's view is that remaps keep widening into areas that have never flooded, which pulls more owners into paying for flood insurance when their odds of a claim are low. The reason is the mortgage: if a home with a federally backed loan sits inside the mapped 100-year floodplain, even just touching the line, the lender has to require flood insurance.

What Does an Elevation Certificate Show?

An elevation certificate is a surveyor's form that shows where the structure sits relative to the BFE, the level floodwater could reach in a 100-year flood. The key numbers are the BFE, the lowest adjacent grade (where the ground touches the house, often where the slab meets the dirt), and the lowest floor elevation.

Hagan puts it this way: a flat map cannot show depth. A house shaded entirely inside the floodplain might sit three inches below the BFE or 13 feet below it. Most buyers feel very differently about those two houses, and the elevation certificate is one of the only ways to tell them apart.

Maps can also be wrong. When Hunter built his own home, the insurance company's flood map showed the house touching the floodplain, which triggered a flood insurance requirement. His elevation certificate showed the lowest adjacent grade sat 6 to 8 inches above the BFE, and his lender dropped the requirement. He bought flood insurance anyway, and the certificate got him a better rate.

When the map is off, FEMA has formal fixes. A Letter of Map Amendment (LOMA) can remove a house that sits on natural ground above the BFE. If fill raised the ground, it is a Letter of Map Revision Based on Fill (LOMR-F). When the mapped flood elevations themselves are off by more than a little, the fix is a Letter of Map Revision (LOMR), and Hunter says those are not uncommon here. Even with a letter in hand, FEMA notes a lender can still require coverage.

On every waterfront purchase, we look for an elevation certificate with the survey. When we can, we get flood insurance quotes before the contract, and if not, during the option period while you can still walk away.

Can You Get Flood Insurance on a Lake House?

Almost always. A client who already owns on the water here recently asked Hagan one question about a house: can I get flood insurance on it? The answer was yes. Hagan says he is not sure he has ever seen a property where flood insurance was unavailable. It can cost more on a home with repeated flood losses, but it is almost never off the table.

Billy Stephens, our Highland Lakes and Rivers specialist, pointed out the catch: coverage is capped. Per FEMA, a National Flood Insurance Program (NFIP) policy tops out at $250,000 for the building and $100,000 for contents. On many lake homes that is well below replacement cost, so owners often add private or excess flood coverage.

Premiums have also shifted. Since FEMA's Risk Rating 2.0 took effect (October 2021 for new policies, April 2022 for renewals), each building is priced on its own risk, with most annual increases capped at 18%. As of our April 2026 recording, Hunter and Hagan see low-risk homes that once paid $400 to $500 a year now paying $1,500 to $2,500, while repeat-loss homes that ran $10,000 to $15,000 are closer to $4,000 to $6,000. Older homes built on the ground before flood maps existed here have generally gotten cheaper to insure, though Hagan has still seen some steep premiums on some home wit severe repetitive loss. Never assume a premium from the flood zone. Get a quote on the specific house.

How Does Flood Risk Affect a Lake House's Value?

You pay a premium for less risk and get a discount for more. If you never want to think about flooding, that home exists, and it costs more.

The difference shows up even on one road. On Turtle Lane, lined with homes on Lake Placid, the lower end is low-lying while the upper end has natural topography. Take two 2,500-square-foot homes on the same water, one elevated above the BFE and one sitting on the ground. Hagan puts the price gap at $50,000 or more, and Hunter has seen it reach the hundreds of thousands, depending on the lake and price point (April 2026). Floodplain location shapes price, not desirability.

Selling a Lake House in a Floodplain

Every question a buyer asks about flooding, you can answer before they ask. Sellers who do that usually see fewer surprises in the option period and fewer buyers walking over a line on a map.

Have the elevation certificate ready. If you have one, find it. If you do not, consider ordering one before you list. It answers the buyer's first question, shows where your house actually sits relative to the BFE, and lets buyers get real insurance quotes quickly. If it shows the house is above the BFE but mapped inside the floodplain, a LOMA can remove that question altogether. Start early, since FEMA has to review it.

Document the flood history. Since September 1, 2019, the Texas Seller's Disclosure Notice has asked whether the property sits in a 100-year floodplain, 500-year floodplain, or floodway, whether it has flooded, and whether you have ever filed a flood insurance claim or received FEMA or SBA assistance for flood damage. Answer it fully. If the house only flooded in 1998, or has been elevated since, say so plainly and keep the records.

Offer your flood policy. FEMA lets an NFIP policy be assigned to the buyer at closing, and the buyer keeps its rating and any discounts. If your premium is favorable, share the declarations page early. It can be a real selling point. NOTE: Not all policies are transferable. It depends on who your insurer it.  

Price against comparable risk. An elevated home and a home on the ground should not be priced off each other without any adjustment. On the Guadalupe Lakes, Frank Baker, our lead listing agent and a Certified Residential Real Estate Appraiser since 2000, prices with that difference in mind. On the Highland Lakes, Brooke and Billy do the same.

Lake House Floodplain FAQs

Should I rule out a lake house in a floodplain?

Not on the map alone. Check the property's flood history, the lay of the lot, and the elevation certificate. A lot can sit in the floodplain while the living area sits above the BFE, and that home carries far less risk than the map suggests.

What does an elevation certificate tell me?

Where the structure sits relative to the BFE, including the lowest adjacent grade and the lowest floor. The key is what the elevation certificate says about the specific structure on the property, not the lake overall. Flood maps do not give you the full picture. FEMA no longer requires one to buy an NFIP policy, but it can still lower your premium.

Do I have to buy flood insurance if the house is above the BFE?

It depends on the map and the lender. If the house is mapped inside the 100-year floodplain and the loan is federally backed, the lender must require flood insurance until FEMA removes the structure with a LOMA or LOMR-F, and the lender can still require it after that. Many owners carry a policy anyway.

What do I have to disclose about flooding when I sell a lake house in Texas?

The Texas Seller's Disclosure Notice asks whether the property is in a floodplain, floodway, or flood pool, whether it has flooded, and whether you have filed a flood insurance claim or received FEMA or SBA assistance for flood damage. Answer from what you know, and keep the records that back it up.

Before You Rule Out a Lake House in a Floodplain, Talk to Our Team

Whether you are buying or selling, floodplain questions are where waterfront experience pays off. Our team pulls the flood history, reads the elevation certificate, and gets real insurance numbers, so a line on a map does not cost you the right house or the right buyer. The Lakefront Group is the #1 producing group at Keller Williams Heritage, the largest Keller Williams market center in the world, three years in a row. Call us at 830.253.5253, contact our team, or set up a Lake House Alert. See you on the water.