Why 'No' on the Flood Zone Box Doesn't Mean Your Houston Home Is Safe

In Texas, a home seller has to tell you whether the house sits in a FEMA-designated flood zone, and the form draws that line using whatever map is officially in effect the day they sign it. In Harris County right now, that line is already out of date. FEMA’s own draft update, posted for public viewing in February 2026, would more than double the number of local properties sitting inside a mapped 100-year floodplain, from roughly 160,000 to around 320,000. None of that is official yet, which means the box on today’s disclosure form can say no and still be legally accurate for a house every updated model says floods.

The Move Live Love TX Team™ is a husband-and-wife real estate team serving Houston and the surrounding areas, helping people make the move that comes next. A good chunk of the last several months has been spent walking buyers and sellers through exactly this gap, what a form requires versus what a property’s real flood history says.

The Four Questions Every Texas Disclosure Form Asks About Flooding

Most people assume the flood section of the Texas Seller’s Disclosure Notice is one yes-or-no question. Under Texas Property Code Section 5.008, it’s four separate questions, and a seller answers each one based on their own knowledge:

• Whether the property sits wholly or partly in a FEMA-designated 100-year floodplain
• Whether it sits wholly or partly in a 500-year floodplain
• Whether it’s located in a floodway, or in a flood pool behind a reservoir
• Whether the seller has ever filed a flood insurance claim, or received FEMA or SBA disaster assistance, tied to the property

That last question catches people off guard the most. A house can be marked no on every floodplain box and still carry a yes on the claims question, because it flooded once from a backed-up storm drain with nothing to do with FEMA’s map at all. Read the whole form carefully, not only the box that matches the word “flood” in your head.

The Map That’s About to Move Under Everyone’s Feet

Harris County hasn’t had a full flood map overhaul since 2007. FEMA’s new modeling project, MAAPnext, redid the math for all 22 of the county’s watersheds and swapped in current rainfall data instead of decades-old assumptions, and the difference is significant. The old maps assumed a 100-year storm dropped about 13 inches of rain in 24 hours. The new ones, built on current NOAA data, put that closer to 17 inches. Houston Public Media reported in February 2026 that the draft maps would expand the mapped 100-year floodplain by about 50,000 acres countywide.

The catch is timing. These are still draft maps, open for review but not usable yet for insurance or lending decisions. County officials have pushed the expected effective date back twice already, and the current estimate lands around 2028 or 2029, after a formal appeal period FEMA hasn’t opened. A home can sit squarely inside the new draft floodplain today and still legitimately check no on a current disclosure form, because the form is only allowed to run off the map that’s officially in effect right now.

Why the Box Still Undersells the Risk Even Before the Map Changes

This part matters no matter when the new maps go final. About 70 percent of the homes that flooded during Hurricane Harvey in 2017 sat outside FEMA’s mapped high-risk zones at the time. The map was never a complete picture of where water goes in a city built on flat land with more concrete every year. Peter’s background in construction and mortgage lending shows up here more than almost anywhere else in the process. On a pre-listing walkthrough, he’s looking at grading, drainage paths, and how water moves off a lot during a real storm, not only which zone a parcel is drawn into on a federal map that’s updated once every decade or two.

The Move Live Love TX Team is a husband-and-wife real estate team serving Houston and the surrounding areas, helping people make the move that comes next, and that’s why we treat a flood map as one data point, not the whole verdict on a house.

What This Means Right Now, Whether You’re Selling or Buying

If you’re selling, answer the disclosure form off the current, officially effective map, since that’s what the law requires. Be straight about any flooding you know happened, even if you never filed an insurance claim over it, since the claims question and your own knowledge of the house are separate obligations. If you’re buying, don’t treat a no on that form as proof of safety. Pull up the FEMA flood map yourself, and look at the preliminary MAAPnext viewer too, even though it carries no legal weight yet, because it’s telling you something real about how the ground around that house behaves.

The Move Live Love TX Team is a husband-and-wife real estate team serving Houston and the surrounding areas, helping people make the move that comes next, and on anything near a bayou, a creek, or low ground, we’re pulling both maps ourselves before we ever talk price. For the rest of what a Texas disclosure notice covers beyond flooding, from foundation issues to what a seller legally never has to tell you, our look at what Texas home sellers are legally required to disclose walks through the rest of the form. Rising flood risk is also already showing up on renewal bills across the metro, which our piece on why Houston insurance premiums jumped again this year covers in more depth. And if you’re house hunting anywhere near water, our Buyer’s Guide walks through the rest of what to check before you write an offer.