Texas Gulf Coast hurricane, windstorm and flood insurance

Summary

Buying a home on or near the Texas coast means answering three separate insurance questions, not one. A homeowners policy covers fire, theft and many other losses. Wind and hail on the coast often need a different policy. Flood needs a third. The Texas Department of Insurance (TDI) lays this out in a one-page chart titled "Home, flood, wind: Which policies do you need?", and the practical lesson for a retiree is that a mortgage lender, an insurance agent and a seller may each be talking about a different one of the three.

This guide explains what the Texas Windstorm Insurance Association (TWIA) is and which counties it serves, how TDI and TWIA describe eligibility and the building-code certificate that comes with it, how flood insurance and FEMA flood maps work, and what the National Hurricane Center and National Weather Service say about storm surge and inland flooding. It deliberately quotes no premiums and no deductible percentages. Those vary by address, roof, elevation, construction year and carrier, and they change; the only reliable number is a written quote for the exact property.

Risk on this coast is a property-by-property question. TWIA's service area is defined by county and, for Harris County, by a highway and city limits, but storm surge, rainfall flooding and wind damage do not follow those lines. The sections below separate what is defined by rule from what depends on the parcel, and end with questions to put to an agent and a seller.

Key takeaways

• Coastal Texas buyers face three separate coverages: homeowners, wind and hail, and flood. TDI says most home policies do not cover floods and most coastal home policies do not cover wind and hail, so each must be arranged on its own.
• TWIA writes wind and hail coverage only, for property in its designated area: all 14 first-tier coastal counties plus the part of Harris County east of Highway 146 that is inside the listed cities. It is a residual insurer and the applicant must have been denied coverage by a private insurer.
• A TWIA policy generally requires a certificate of compliance showing the structure was built or repaired to windstorm building codes, and most new construction, roof replacements and major repairs require an inspection. Check the certificate before making an offer.
• Flood insurance comes through the NFIP, typically has a 30-day waiting period, and is required for TWIA coverage only when the property is in a V-type flood zone, was built or altered after September 1, 2009 and NFIP coverage is available. About 29% of NFIP claims come from outside high-risk areas, according to FloodSmart.
• Hurricane risk is parcel-dependent. Storm surge, wind and inland rain flooding follow different patterns, as Hurricane Harvey showed in 2017. Use the FEMA map for the specific address and a written quote for the specific property, and never treat a county name as a risk label.

Three policies, three different jobs

TDI's chart gives each policy a purpose. The homeowners policy protects the house and belongings and covers damage from fire, lightning, theft, wind, hail and more. The flood policy covers damage from rising water. The wind and hail policy covers damage from wind and hail. TDI adds two cautions: most home policies do not cover floods, and most home policies on the coast do not cover wind and hail. Its guidance for buyers is to call the homeowners agent for the first, to call an agent or use FloodSmart.gov for flood, and to call an agent or use TWIA.org for wind and hail.

TDI's tip sheet on windstorm insurance explains where the line falls. Windstorm insurance pays to repair or rebuild a house damaged by hail or wind from a tornado, thunderstorm or hurricane. Anywhere in Texas except along the coast, a homeowner probably has wind and hail coverage inside the homeowners policy, although the deductible for wind damage may differ from the deductible for other losses. Along the coast, the homeowners policy might not cover wind and hail, and the owner needs to buy a separate windstorm policy, often from TWIA. TDI says to ask the agent about the options.

TDI states that windstorm insurance is not required by law in Texas, but a lender is another matter: a buyer who lives near the coast and has a mortgage will likely be required by the lender to carry it. FEMA says the same about flood: homes and businesses in high-risk flood areas that have mortgages from government-backed lenders are required to have flood insurance. A cash buyer is not bound by a lender's requirement, which is a reason to think about each coverage on its merits rather than as a closing formality.

What TWIA is and where it applies

According to its own overview, TWIA was established in 1971 by the Texas Legislature to provide wind and hail coverage to applicants unable to obtain insurance in the private market. The Legislature acted after market constrictions along the coast following several hurricanes. TWIA is governed by Chapter 2210 of the Texas Insurance Code. It is not a state agency and does not receive money from the general revenue. The overview calls it a residual insurer of last resort that is not a direct competitor in the private market. It operates as an insurance company, issuing policies, collecting premiums and paying losses.

The service area is defined in two steps. The seacoast territory includes 14 first-tier and 14 second-tier coastal counties. The designated catastrophe area is the part of that territory where the Commissioner of Insurance has found that windstorm and hail insurance is not reasonably available. TWIA says the designated area currently includes the entire first tier and a portion of Harris County, which is second tier. The 14 first-tier counties it lists are Aransas, Brazoria, Calhoun, Cameron, Chambers, Galveston, Jefferson, Kenedy, Kleberg, Matagorda, Nueces, Refugio, San Patricio and Willacy.

The Harris County rule is narrower than a county name. TWIA says the covered area includes parts of Harris County east of Highway 146, and that a property inside the city limits and east of Highway 146 qualifies if it is in La Porte, Morgan's Point, Pasadena, Seabrook or Shore Acres. A Harris County address therefore needs a check against both the highway and the city, and an address in a second-tier county outside that Harris County area falls outside the designated area TWIA describes. Because the designation is set by the Commissioner and can change, confirm the current area with TWIA or an agent before relying on a map from a listing site.

TWIA coverage is for wind and hail only. Its overview says TWIA policies cover wind and hail losses and no other perils. TWIA's coverage page lists the property types it writes: dwellings, personal property and manufactured homes on the residential side; commercial buildings, business personal property, townhouses and condominiums on the commercial side; and miscellaneous items such as signs, fences, swimming pools and flagpoles. A TWIA policy does not cover flood, so a buyer who relies on it alone has insured one of the two main coastal perils.

As of its 2026 hurricane-season statement, TWIA reports that it has access to funding totaling $4.3 billion. The overview describes a funding order that begins with TWIA premiums and amounts in the Catastrophe Reserve Trust Fund, then layers of public securities and company assessments, then reinsurance or alternative risk financing in an amount sufficient to achieve total funding not less than a 100-year hurricane season. It adds that the public securities are repaid from TWIA premiums and surcharges on TWIA policies. The structure is mentioned here because it is the legal basis for surcharges, not as a forecast of any particular year's cost.

Eligibility and the windstorm certificate

TWIA lists the conditions a property must meet. The property must be in the area designated by the Commissioner of Insurance. The applicant must have been denied coverage by at least one authorized insurer actively writing or renewing windstorm and hail coverage in the designated area. The property must be certified by TDI (a WPI-8 or WPI-8-E) or by TWIA (a WPI-8-C) as built to applicable building codes, with limited exceptions. Properties in flood zones V, VE or V1-30 that were built or altered after September 1, 2009, and that can obtain NFIP flood insurance, must provide proof of flood insurance. And the structure must meet other underwriting requirements, including being kept in an insurable condition, meaning in good repair with no unrepaired damage or hazardous conditions.

TDI's description of how to buy a TWIA policy matches this: live or own a business in the service area, have asked an insurer for wind and hail coverage and been turned down, and get an inspection and certificate showing the home was built or renovated to certain construction codes. The policy is bought through an insurance agent. TDI also warns against waiting: a TWIA policy cannot be bought if there is a hurricane in the Gulf of Mexico, so a buyer who intends to close in hurricane season should arrange the coverage early.

The certificate is the item that most often surprises buyers. TWIA's overview says it requires a Certificate of Compliance on all structures constructed, altered, remodeled, enlarged, repaired or added to on or after January 1, 1988. TDI administers the windstorm inspection program and issues the certificates. A WPI-8 is issued for ongoing construction, inspected by an appointed Texas licensed professional engineer or a TDI windstorm inspector while the work is underway. A WPI-8-E is issued for completed construction and inspected by a Texas licensed professional engineer. TWIA issued WPI-8-C certificates for completed construction between January 1, 2017 and May 31, 2020, and a 2019 law moved that responsibility to TDI beginning June 1, 2020. TWIA states that its earlier certificates remain valid and that the owner does not have to re-certify unless the structure is updated after certification.

TDI explains what triggers an inspection. Most new construction, roof replacements, major repairs and other alterations require an inspection and a certificate of compliance. TDI's examples of work that does not require one include roof repairs of less than 100 square feet that do not involve decking, painting, carpeting, cabinets and other nonstructural items, repair or replacement of fences, gutters, decorative shutters, steps and screen doors, plumbing and electrical repairs, and replacement of glass in windows or doors. TDI also says that inspecting a completed structure is more difficult and may cost more, so asking a contractor how the inspection will be handled before a roof is replaced is worthwhile.

A buyer can check a property's certificate. TDI says a WPI-8 or WPI-8-E can be looked up on the TDI windstorm website, and a WPI-8-C issued by TWIA between 2017 and May 2020 can be checked with TWIA's certificate lookup tool. A missing or unclear certificate on an older renovation is a question for the seller before an offer, because it can determine whether TWIA coverage is available at all.

Flood insurance, the 30-day wait and the TWIA link

Flood coverage comes through the National Flood Insurance Program (NFIP), which FEMA manages and delivers through a network of more than 47 insurance companies and the NFIP Direct. FEMA states that flood insurance is a separate policy that can cover buildings, contents or both, and that most homeowners insurance does not cover flood damage. It is available to anyone living in one of the 22,600 participating NFIP communities. TWIA does not provide flood insurance, and TWIA's own flood page says so.

Waiting is the costliest mistake. FEMA says to plan ahead because there is typically a 30-day waiting period for an NFIP policy to go into effect, unless the coverage is mandated because a government-backed lender requires it or is related to a community flood map change. TWIA's flood page adds that the 30 days applies to most flood insurance policies, not only those from the NFIP, and that if flooding is forecast and a buyer calls an agent then, it is already too late. The National Weather Service office serving the Rio Grande Valley makes the same point about storm surge: a flood policy does not take effect until 30 days after the first payment, so the sooner a property owner signs up, the sooner the policy is active.

TWIA ties its own eligibility to flood insurance in one specific situation. Flood insurance is required for TWIA coverage when all three of these conditions are met: any part of the property is in a V, VE or V1-V30 flood zone as defined by the NFIP; flood insurance is available for the property from the NFIP; and the structure was constructed, altered, remodeled or enlarged after September 1, 2009. Maintenance and repairs do not count unless the work is used as an opportunity to alter, remodel or enlarge. TWIA notes that V zones have an increased chance of flooding from coastal storm waves and storm surge, and that the requirement is mandated by Chapter 2210 of the Texas Insurance Code and TWIA's Plan of Operation.

When the requirement applies, TWIA sets a minimum amount: the smallest of 90% of the amount of insurance on the property that TWIA insures (if NFIP coverage is available on a replacement cost basis), 90% of the actual cash value (if it is not), or the maximum available under the NFIP. For example, if TWIA insured a dwelling for $300,000 and replacement cost NFIP coverage were available, 90% would be $270,000, but the NFIP maximum for the property could be lower and would then set the minimum. TWIA also states that the requirement is not applied to insurable corporeal movable property located on or above the third floor of a structure. A buyer should treat these as TWIA's rules for TWIA eligibility, not as advice on how much flood coverage is wise.

Flood insurance is not only for the coast. FloodSmart, the NFIP's consumer site, states that almost one-third of NFIP flood insurance claims, 29%, come from outside high-risk flood areas, and that flooding can happen anywhere. For a retiree who plans to live inland in a Hill Country, Highland Lakes or north Texas town, the flood question is still worth asking about the specific parcel, and the hail, wildfire, drought, heat and power-outage guide covers the inland hazards.

Flood maps and why risk is parcel-by-parcel

FEMA's flood map page defines the basic vocabulary. Flood maps show how likely an area is to flood. Any place with a 1% or higher chance of experiencing a flood each year is considered high risk, which FEMA translates to at least a one-in-four chance of flooding during a 30-year mortgage. FEMA is explicit that floods do not follow city limits or property lines, that heavy rain, poor drainage and nearby construction can put a property at risk even away from water, and that there is no such thing as a no-risk zone, although some areas have lower or moderate risk.

The FEMA Flood Map Service Center is the official online location for flood hazard mapping products created under the NFIP, including a community's flood map, and the National Flood Hazard Layer is its GIS data. The maps show a community's flood zone, floodplain boundaries and base flood elevation, according to FloodSmart. Mortgage lenders use them to determine insurance requirements. A buyer should pull the map for the specific address and ask the agent which flood zone it shows, rather than relying on a neighborhood or ZIP code description.

Maps change. FEMA says updates are a collaboration between the community, through its floodplain administrator, and FEMA. After preliminary maps are released, the community has 90 days to submit technical data to support an appeal before it decides whether to adopt them, and at any time after adoption data can be submitted through the Letter of Map Change process, which includes map amendments (LOMA) and revisions (LOMR). A property's zone on today's map may differ from the zone on the map in force when a house was built, and FEMA's NFIP page notes that coverage related to a community flood map change is one of the exceptions to the usual 30-day wait.

The same parcel logic applies to TWIA. The designated area is set by county, and for Harris County by highway and city limits, but the inspection record, roof, elevation and flood zone belong to the parcel. Two houses in the same coastal county can have very different coverage histories and very different exposure to surge, and two houses in different counties can face the same rainfall flood. County names are therefore a starting point for asking questions, never a risk label for a whole metro or coast.

What the National Hurricane Center and Weather Service say about the hazards

The National Hurricane Center lists the major hurricane hazards as storm surge and storm tide, heavy rainfall and inland flooding, high winds, rip currents and tornadoes. It says storm surge and large waves produced by hurricanes pose the greatest threat to life and property along the coast, that surge can reach heights well over 20 feet and span hundreds of miles of coastline, and that it can travel several miles inland. In its surge overview, NHC calls storm surge currently the leading cause of fatalities from hurricanes and says it can travel up rivers and canals, reaching well inland.

Surge height is not a simple function of category. NHC lists the factors: storm intensity, forward speed, size, angle of approach, the width and slope of the ocean bottom, and the shape of the coastline and local features. A faster storm produces a higher surge at the immediate coastline, while a slower one produces a surge that penetrates farther inland. A wide, gently sloping continental shelf allows a higher surge, and NHC names the Gulf Coast as particularly vulnerable for that reason. NHC adds that waves on top of the surge can add feet to the water level and can demolish a structure not designed to withstand them, and that buildings that survive the winds can be damaged if erosion undermines their foundations.

Rain is a separate hazard. NHC says tropical cyclones often produce torrential rains in excess of 6 inches and that flooding is the major threat from tropical cyclones for people living inland. Rainfall amounts are not directly related to the strength of the storm; they depend on the speed and size of the storm and the geography. Slower and larger storms produce more rainfall. For winds, NHC notes that hurricane-force winds, 74 mph or more, can destroy buildings and mobile homes, and that debris becomes flying missiles. That is why wind, surge and rain should be assessed separately for a given address.

The National Weather Service office in Brownsville, describing the Lower Texas Coast, adds local detail. It says most communities there are below 10 feet in elevation, that a storm tide in a large cyclone can raise the mean water level 15 feet or more, and that the shallow continental shelf off Texas means a landfalling storm produces a significantly higher surge than one striking a steeply sloped shelf along parts of the Atlantic coast. For mitigation, the office says a structure with breakaway ground floors or one elevated well above the sand can offer protection from minor to moderate surge, and that for a surge comparable to Ike or Katrina, little can be done to counter it. It names flood insurance as the one thing a property owner can do ahead of time.

What Hurricane Harvey showed in 2017

Hurricane Harvey is the most recent major Texas example and illustrates why the three coverages are separate. The National Weather Service in Corpus Christi reports that Harvey made landfall on August 25, 2017 as a Category 4 hurricane, the first major hurricane to make landfall on the middle Texas coast since Celia in 1970. It says the eye first made landfall on San Jose Island and then near the Rockport and Fulton area at around 10 PM CDT. The highest measured peak gust, 145 mph at 8 meters, was recorded at the Aransas County Airport in Rockport, although the Weather Service cautions that many instruments failed before they could record the highest winds.

Surge and wind affected different places differently. The Weather Service reports storm surge more than 12 feet above ground level at the Aransas Wildlife Refuge, more than 10 feet at Port Lavaca and at least 6 feet at Port Aransas, with storm tides of about 3 to 6 feet above ground at other locations including Seadrift, Port O'Connor and Copano Bay. NHC's report describes wind damage as extreme in Aransas, Nueces, Refugio and the eastern part of San Patricio County, with approximately 15,000 homes destroyed and another 25,000 damaged, and the most severe damage next to Aransas and Copano Bays. It also states that Corpus Christi was spared the worst of the hurricane's effects, with widespread but mostly minor damage. The same storm, in the same counties, produced very different outcomes by location.

The rain fell elsewhere and for days. The Weather Service says Harvey stalled over South and Southeast Texas, with some areas receiving more than 40 inches of rain in less than 48 hours, and that Cedar Bayou in Houston recorded a storm total of 51.88 inches, described as a new North American record. NHC's report gives a NOAA damage estimate for Harvey of $125 billion. These are historical facts about one storm, not a forecast, but they show that the heaviest rain damage can occur well away from the Gulf shoreline, so a buyer inland of the TWIA area can still face a flood claim from a tropical system.

FEMA's NFIP page lists a publication titled "Wind Damage vs Water Damage: What You Need To Know When Filing A Claim", which reflects a practical problem for owners with separate policies: the cause of the loss, wind or water, determines which policy responds. Keeping both policies current, and keeping photographs and an inventory, helps the claim process regardless of the storm.

Questions to ask an agent and a seller

Ask the agent which coverage applies at the exact address. Is the address inside TWIA's designated area, and for Harris County, is it both east of Highway 146 and inside one of the listed cities? Does the homeowners carrier write wind and hail at the address, or must the policy come from TWIA? Does the quote separate the wind and hail deductible from the deductible for other losses, and how is it set? TDI notes that a homeowners policy may carry a different deductible for windstorm damage than for other losses, which can change the out-of-pocket cost of a storm. Ask for the quote in writing and ask what the policy does and does not cover.

Ask about the certificate. Does the house have a WPI-8, WPI-8-E or WPI-8-C, and does it cover the roof, additions and any renovation since January 1, 1988? Can the agent or seller show the certificate lookup result? When was the roof last replaced, and was the replacement inspected? TDI says roof replacements generally require inspection. A house with a good certificate history is easier to insure through TWIA, while one without may need an inspection of a completed structure at the buyer's expense.

Ask about flood. What flood zone does the FEMA map show for the parcel, and is any part of it in a V, VE or V1-V30 zone? Is the structure's construction date before or after September 1, 2009, and has it been altered since? Does the seller have a flood claims history, any prior flood insurance policy or an elevation certificate, and how does the building's lowest floor compare with the base flood elevation? Has the community adopted new maps or is a map change under way? Plan for the 30-day wait by buying the flood policy before it is needed, and before closing if the closing date is near a hurricane season.

Ask about the practicalities. TDI says that after a storm a TWIA policyholder has one year from the storm to file a claim, and 60 days from the date TWIA accepted the claim to dispute the claim amount and ask for an appraisal. TDI's Texas Coastal Outreach and Assistance Services Team helps TWIA policyholders with rights, the claims process and complaints, and TDI's disaster page notes that investigators are sent to areas hard hit by storms to help deter fraud, including shoddy repairs and price gouging. Property taxes and insurance together make up much of a coastal home's carrying cost, so read this guide alongside the Texas property taxes and appraisal districts guide and the Texas retirement taxes guide.

Places where this matters most

• Corpus ChristiThe largest city on the Texas Coastal Bend, centered in Nueces County, with the area's principal hospital campuses, a city-operated international airport, Gulf and bay shoreline, a county-wide windstorm-insurance designation, and a multi-year water-supply drought that the city reports in published restriction stages.
• RockportA small Aransas County bay-side city, closely tied to neighboring Fulton, with one of the oldest age profiles in the Coastal Bend, a freestanding emergency room as its local medical anchor, a county-wide windstorm-insurance designation, and a recent history of direct hurricane impact.
• Port AransasA small Nueces County resort city on a Gulf barrier island with one of the highest shares of residents aged 65 and over in the Coastal Bend, a very high share of vacant (second-home and rental) housing, city-run 24-hour emergency medical services, hospital care on the mainland in Corpus Christi, and direct exposure to Gulf storm surge.

Related guides

• Texas hail, wildfire, drought, heat and power outages: the inland hazards
• Texas summer heat, humidity and climate by region
• Texas property taxes and appraisal districts: how to compare actual total tax bills
• Texas homestead exemption, the age-65 exemption and the school tax ceiling
• Texas retirement taxes: state income tax, Social Security, pensions and federal taxes