What Houston Home Sellers Must Disclose About Flooding
With hurricane season underway and flood anxiety running high, buyers under contract right now need to know exactly what the TREC disclosure form covers, what it doesn't, and how to fill the gaps t…
With hurricane season underway and flood anxiety running high, buyers under contract right now need to know exactly what the TREC disclosure form covers, what it doesn’t, and how to fill the gaps themselves before closing.
If you’re buying a home in Houston right now, you’re signing contracts during one of the most consequential windows of the year. Hurricane season opened June 1. The Gulf is warming. And the house you’re about to put your life savings into may have flooded two or three times in the last decade — information the seller is legally permitted, in some circumstances, to simply not tell you.
Texas has one of the more detailed flood disclosure frameworks in the country, especially since 2021. But the framework has real holes. Sellers, investors, and listing agents who know where those holes are will sometimes use them. This piece is built for the buyer in option period right now, or who’s about to make an offer in Meyerland, Katy, Kingwood, or anywhere else in Harris County where water has a documented history of arriving uninvited.
Here’s what the law actually requires, what it explicitly does not require, and how to research a property’s flood history independently before you sign anything that matters.
The Form Every Houston Home Sale Is Supposed to Include
The controlling legal document in Texas residential real estate is the TREC Seller’s Disclosure Notice, Form OP-H (most recently revised February 1, 2023). Under Texas Property Code §5.008, sellers of most residential properties must complete and deliver this form to buyers.
Section 6 is the dedicated flood disclosure section. It asks sellers to answer whether, to the best of their knowledge, the property has:
- Previously flooded due to a failure or overflow of a water control structure
- Flooded from any other cause, including rainfall
- Is located in a 100-year floodplain (FEMA Zone A or Zone AE)
- Is located in a 500-year floodplain (FEMA Zone X, shaded)
- Is located in a reservoir flood pool area
- Has an elevation certificate on file
- Has been or is currently insured under a flood insurance policy
Every answer is a Yes / No / Unknown checkbox. And every single one is governed by the phrase that defines the form’s entire architecture: “to the best of seller’s knowledge.”
That phrase does a lot of work. It protects honest sellers who genuinely don’t know. It also protects less honest ones who’ve found it useful not to know. The form treats both situations identically.
How Texas Law Changed After Harvey — What SB 339 Added in 2021
Before September 1, 2021, Texas flood disclosure law was meaningfully weaker. Texas Senate Bill 339, effective that date, is the reason Form OP-H looks the way it does now. If you’re working from articles published before 2021 — and a lot of what still circulates online predates the revision — you’re looking at an outdated picture.
Previously, sellers were only asked about 100-year floodplain designation. SB 339 added explicit disclosure of 500-year floodplain status. This matters in Houston because a significant number of properties that flooded during Harvey or Tropical Storm Imelda sit in shaded Zone X — the 500-year designation — not Zone AE. Those owners weren’t previously required to disclose that exposure. Many didn’t.
The reservoir flood pool disclosure is the biggest change for West Houston. During Harvey in August 2017, the Army Corps of Engineers released water from Addicks and Barker Reservoirs to protect downtown Houston’s drainage infrastructure. Thousands of homes in ZIP codes 77084, 77094, and 77449 flooded not from direct rainfall but from controlled government water releases. Pre-2021 law had no mechanism requiring sellers to distinguish between those causes. SB 339 created the explicit reservoir flood pool question — which should have existed long before Harvey made it impossible to ignore.
SB 339 also requires disclosure of whether a property previously carried flood insurance, not just whether it carries it now. Lapsed flood policies are a red flag that investors sometimes quietly remove from the record before listing. And sellers must now disclose whether the property has received FEMA flood mitigation assistance — grants for elevation, acquisition, or storm-proofing under the Hazard Mitigation Grant Program.
The practical effect in 2025 is straightforward. A seller in the Addicks-Barker footprint who purchased a flooded home in 2018, renovated it, and is now listing it faces disclosure obligations that would not have applied to that same transaction four years earlier. Whether every seller in that position is answering those questions honestly is the reason this article exists.
What Sellers Are Not Legally Required to Tell You
This is the section most flood disclosure guides skip, because it makes the picture uncomfortable. Here are six primary gaps — and some of them are substantial.
The investor who never lived there. An investor who purchased a flooded home at auction, hired contractors to gut and rebuild it, and never occupied the property can answer “Unknown” on virtually every question in Section 6 and be technically truthful. This is the most common gap buyers encounter in Meyerland and parts of West Houston, where post-Harvey flip activity was intense. The form doesn’t require sellers to have looked into the property’s history. Think about that: a buyer can purchase a flood-damaged home, strip it to the studs, rebuild it, and list it — and the law hands them a clean checkbox.
New construction. Builders don’t complete Form OP-H at all. If you’re buying new construction in Fulshear, Richmond, or Conroe — areas with significant development in flood-prone drainage corridors — you’ll receive no seller’s disclosure on flooding. You’re responsible for researching the site’s flood history and current zone designation yourself. Texas law exempts new construction on the theory that new sites have no history to disclose. But the land itself has a flood history regardless of what was built on it previously.
Foreclosures and bank-owned properties. Texas Property Code §5.008(e) explicitly exempts REO properties from disclosure requirements. A bank that took back a property after Harvey doesn’t know its flood history in any meaningful sense, and Texas law doesn’t require the bank to find out before selling. REO listings in flood-prone ZIP codes are a category where you must self-research, full stop.
Estate and court-ordered sales. Probate sales and divorce settlements are also exempt under §5.008(e). An estate sale of a home that flooded three times may proceed with no written disclosure obligation. The theory is that courts are busy places and disclosure adds friction. The result is the same regardless: buyers in estate and divorce sales have no legal guarantee of flood disclosure.
NFIP claims history. The National Flood Insurance Program maintains claim records on every property ever covered. A home that had significant NFIP claims across two storms might be sitting on the market with the seller checking “Yes” to the prior insurance question — without disclosing the number or amount of claims. Sellers aren’t required to pull that history or share it. The form asks only whether insurance was carried, not what happened while it was.
Neighborhood context. If the street flooded and water stopped at the property line, the seller has no obligation to disclose it. If every home within 200 feet received county buyout offers because of repetitive flooding and the subject property itself stayed dry, the seller isn’t required to mention it. Context that would be material to any reasonable buyer doesn’t have to be volunteered. The form is structured around the individual parcel, not the surrounding block. You can see how that creates problems.
Five Houston Neighborhoods Where Buyers Should Be Especially Skeptical
The disclosure gaps above cluster in specific neighborhoods with documented flood histories and active markets. For broader context on how these dynamics are playing out in pricing and inventory right now, see what the Houston housing market actually looks like at mid-year 2026.
Meyerland (77096) flooded in the Memorial Day storms of 2015, the Tax Day storm of 2016, and Hurricane Harvey in 2017. Three major events in under three years. The neighborhood has a high rate of post-flood renovation — homes gutted to the studs and relisted, sometimes by investors, sometimes by original owners who rebuilt. The disclosure risk here isn’t that sellers don’t know. It’s that a property that flooded in 2015, again in 2016, and again in 2017 gets three events squeezed into a single “Yes” checkbox. That checkbox doesn’t come close to capturing what happened to that house.
The Addicks-Barker Reservoir footprint (77084, 77094, 77449) experienced flooding from controlled government releases, not the storm directly. The federal takings litigation — In re: Upstream Addicks and Barker Flood-Control Reservoirs in U.S. Court of Federal Claims — resulted in findings by approximately 2021 confirming that affected property owners suffered government-caused flooding and received compensation. That record makes any post-2021 seller’s claim of “unknown” flood history in this footprint very hard to credit. Any seller in these ZIP codes who answers “Unknown” to the reservoir flood pool question should be pressed, in writing, to explain why. The public record is not obscure.
The Clear Creek corridor in Friendswood (77546) has a different problem. The creek floods regularly — and it straddles the Harris-Galveston County line. Flood control jurisdiction, buyout programs, and disclosure standards interact differently on opposite sides of that boundary. Buyers in 77546 should independently verify which county’s records apply to the specific parcel and cross-check both Harris County and Galveston County flood data. It’s easy to overlook and occasionally expensive to skip.
Kingwood and Lake Houston (77339, 77345) experienced water releases during Harvey that created flooding patterns parallel to the Addicks-Barker situation — government-managed discharge affecting homes that would not have flooded from rainfall alone. The area has recovered substantially and values have rebounded. That recovery is part of what makes due diligence harder here. Less visible evidence remains, and sellers have real incentive to minimize how they characterize what happened in 2017.
The Energy Corridor along Buffalo Bayou (77079, 77077) presents high home values and correspondingly high stakes in disclosure decisions. Harvey flooding here was severe and well-documented. The buyer pool for luxury properties is not always more sophisticated about flood research than buyers in mid-range markets. Sometimes it’s less so. Price doesn’t buy diligence.
How to Look Up a Property’s Flood History Yourself
Don’t wait for the seller’s disclosure to tell you whether a house flooded. These tools reveal what Form OP-H frequently doesn’t.
harriscountyfemt.org — The Harris County Flood Education Mapping Tool is your first stop. It’s parcel-level flood event data across major storms: Harvey (August 2017), Tax Day (April 2016), Memorial Day (May 2015), and Tropical Storm Imelda (September 2019). Free and publicly accessible. If you haven’t used it, spend twenty minutes before your next offer. It’s genuinely useful.
msc.fema.gov — FEMA’s Flood Map Service Center lets you search a property address to see its current FIRM zone designation: Zone AE (100-year floodplain), shaded Zone X (500-year), or unshaded Zone X (minimal hazard per FEMA). Cross-check this against the seller’s answers to the floodplain questions in Section 6. A seller who checks “No” on the 500-year floodplain question while FEMA’s map shows shaded Zone X has some explaining to do.
hcad.org — Harris County Appraisal District records show improvement value history. Look for years where improvement values dropped significantly and then rebounded. A home appraised at a high improvement value in 2016, reassessed sharply downward in 2018, and recovering by 2020 is telling you something about major work. HCAD also shows permit records in summary form.
search.hctx.net/permits — Harris County permit records can be searched by address. Look for permits pulled between August 2017 and December 2019. Post-Harvey reconstruction permits — electrical, plumbing, foundation repair, drywall — are specific indicators. Not all post-flood repair work was properly permitted, which is its own concern. The absence of permits after Harvey is not a clean bill of health. The presence of permits for extensive interior work during that period is significant and worth investigating further.
hcfcd.org buyout map — Harris County Flood Control District has purchased hundreds of properties under its voluntary buyout program for repetitively flooded homes. Search adjacent parcels. A cluster of buyout properties in the immediate neighborhood tells you something about repetitive flood risk that the seller isn’t required to disclose and probably won’t mention.
NFIP Claims History — Maintained by the National Flood Insurance Program. Can be requested through your insurer or by asking the seller to authorize a disclosure request. Make this a contract contingency.
twdb.texas.gov — The Texas Water Development Board Flood Viewer provides supplemental data including historical stream gauge records and watershed-level flood information. Most useful for properties near named waterways — particularly in the Clear Creek corridor, where county-level tools may not tell the full story.
None of these tools replaces a professional inspection. Collectively, they give you a flood history picture far more complete than anything a seller’s disclosure form is legally required to provide. For guidance on what a thorough inspection should cover beyond flood history, see what a Houston home inspection should cover that many inspectors skip.
What Texas Courts Have Said When Disclosure Falls Short
The primary consumer legal remedy for fraudulent or materially incomplete flood disclosure is the Texas Deceptive Trade Practices Act. The DTPA matters for one practical reason: it allows courts to award treble damages plus attorney’s fees when a seller is found to have knowingly misrepresented a material fact. That fee-shifting provision makes flood fraud cases economically viable to pursue, even on a mid-priced home.
The foundational Texas standard on non-disclosure fraud comes from Smith v. National Resort Communities, which established that concealment of a known material defect constitutes fraud even without an affirmative misrepresentation. Applied to flood disclosure: a seller who knows a home flooded and checks “No” on Form OP-H faces both DTPA and fraud exposure.
The Addicks-Barker federal takings litigation has specific implications for West Houston buyers. In In re: Upstream Addicks and Barker Flood-Control Reservoirs, the U.S. Court of Federal Claims confirmed by approximately 2021 that the government’s reservoir releases during Harvey constituted a taking and awarded compensation. That record makes it very difficult for a seller in 77084, 77094, or 77449 to credibly claim in 2025 that their Harvey flooding history is unknown.
Buyers who believe they were defrauded can file a complaint with TREC against the listing agent — not the seller directly, since TREC licenses agents, not sellers. Agents have an independent duty not to knowingly misrepresent material facts, even when the seller’s written form is technically checked correctly. TREC’s public disciplinary records are at trec.texas.gov and include prior flood disclosure complaints worth reviewing for agents who’ve worked extensively in high-flood neighborhoods.
One thing worth noting about the legal landscape: no widely publicized major civil case arising specifically from Harvey-era flood disclosure fraud has come out of Harris County district courts. That absence doesn’t mean sellers are behaving well. It means these disputes almost always resolve privately — through mediation, renegotiated sale prices, or pre-trial settlements. The takeaway is less comforting than it sounds: litigation is slow, expensive, and uncertain. Getting the research right before closing is far more protective than pursuing remedies afterward.
Questions to Ask That Go Beyond the Disclosure Form
The following questions are not required by Texas law on Form OP-H. But listing agents who knowingly convey false answers — even verbally — face TREC liability, because agents are independently bound by disclosure obligations beyond what the seller’s form requires. Put these questions in writing, through your buyer’s agent, so there’s a documented record.
Ask the seller’s agent:
- Has this property ever been the subject of an NFIP flood insurance claim, and if so, can the seller provide the claims history or authorize its release?
- Were any post-flood repairs or renovations completed without permits pulled through Harris County?
- Have any adjacent or neighboring properties received county buyout offers from HCFCD?
- Was the property vacant, tenant-occupied, or owner-occupied during Hurricane Harvey or Tropical Storm Imelda?
- Has the seller ever been informed by an insurance company, a flood control district, a FEMA representative, or any government agency that the property is within a reservoir flood pool area?
- Was a flood elevation certificate ever obtained for this property? If so, can it be provided, and who prepared it?
- Has the seller ever been advised by an insurer that the property is ineligible for standard NFIP coverage or subject to a higher-risk designation?
Your inspector can offer meaningful perspective on flood signatures — but hire someone with documented experience in Harvey-era flood damage assessment in the specific watershed. Brays Bayou, Buffalo Bayou, Clear Creek, and Lake Houston each have different damage patterns. An inspector who primarily works in The Woodlands may not recognize what they’re looking at in Meyerland. Ask whether the condition of flooring, baseboards, insulation, and HVAC equipment suggests prior water intrusion.
The distinction between written and verbal inquiry matters. Written questions submitted by your buyer’s agent to the listing agent create a paper trail. A verbal assurance that “this property never flooded” from a listing agent who knows otherwise is documented misconduct — if you documented it. A phone call you remember is worth considerably less in a post-closing dispute than you’d expect.
Before You Sign — A Pre-Offer Checklist
Texas option periods give buyers a window to walk away for any reason, paying only the option fee. Everything below should be completed before that window closes. Ideally before you make the offer, so you can price flood risk into what you’re willing to pay.
Before submitting an offer:
Confirm which exemption category applies to this seller. Owner-occupant? Investor who never lived there? REO/foreclosure? Estate sale? New construction? The exemption category determines how much weight the OP-H answers actually carry.
Search the address in the Harris County Flood Education Mapping Tool at harriscountyfemt.org and review flood event data for Harvey, Tax Day, Memorial Day, and Imelda. Check the current FIRM zone at msc.fema.gov and compare it to the seller’s Section 6 answers. Pull Harris County permit records at search.hctx.net/permits and look for permits issued August 2017 through December 2019. Review HCAD improvement value history for the post-Harvey dip-and-recovery pattern. Check the HCFCD buyout map at hcfcd.org for adjacent parcels.
As contract contingencies:
Request the NFIP claims history and flood insurance declarations page. Negotiate this into the contract before the option period begins. Ask in writing, through your buyer’s agent, the questions listed above. Request any elevation certificates in the seller’s possession.
During the option period:
Hire an independent inspector with documented experience in Harvey-era flood damage assessment and specific familiarity with the relevant watershed. Verify flood zone designation independently, even if the seller has provided an elevation certificate — FEMA maps are updated periodically and don’t always match the certificate on file.
One last thing worth sitting with. Buyers under contract right now — in June, July, August — are closing against an active hurricane season. A named storm that produces significant rainfall while you’re in your option period will tell you something about a property that no form could. But waiting to see whether it floods is not a research strategy. The work above is most protective when completed before the option period expires.
Houston’s flood disclosure framework is stronger than it was before Harvey, and stronger than it was before 2021. But it still has gaps wide enough to cost buyers hundreds of thousands of dollars if they treat Form OP-H as the final word. The research tools above are free and publicly accessible. The questions are legally and ethically appropriate to ask. None of it takes more than a week to complete, and you’ll find additional context for navigating Houston real estate decisions like this one in our moving & real estate coverage.
The disclosure form tells you what the seller chose to answer. Everything else, you have to find yourself.
