Harris County Insurance: Wind, Flood and TWIA by Address

Two maps divide the county

The first map belongs to the Texas Windstorm Insurance Association. TWIA's coverage area includes only part of Harris County: property east of Highway 146 and inside the city limits of La Porte, Morgan's Point, Pasadena, Seabrook or Shoreacres. Baytown, Deer Park and the rest of the county are outside it, and so is any part of those five cities west of 146. Outside the area, wind and hail sit inside the regular homeowners policy, on that insurer's terms.

An address inside the area is a reason to check eligibility, not a guarantee of acceptance. TWIA also requires a denial from at least one authorized insurer actively writing wind and hail coverage in the designated area, a windstorm certificate of compliance for the building with limited exceptions, and compliance with its other underwriting rules. If any part of the property is in a V, VE or V1-V30 flood zone, the structure was built, altered, remodeled or enlarged after September 1, 2009, and NFIP flood insurance is available, TWIA requires flood coverage as well. Ask the agent to confirm the exact location and certificate status before relying on a TWIA quote.

The second map is water. The Harris County Flood Control District's Flood Education Mapping Tool shows floodplain, watershed and ponding layers for any address, across the 23 primary watersheds the district counts in the county: Buffalo Bayou through the Energy Corridor and downtown, Brays Bayou past the Texas Medical Center, Greens Bayou, White Oak Bayou, Cypress Creek, the San Jacinto River and more. Read all three layers. A home can sit outside the mapped floodplain and inside a ponding area that fills when rainfall overwhelms local drainage. The tool is an educational starting point, not an insurance determination or a promise that an unmapped property won't flood.

Harvey is the reference storm

Hurricane Harvey stalled over the region in August 2017. The Flood Control District's final report put the county's highest four-day rainfall at 47.4 inches, at the Clear Creek gauge at Interstate 45, and estimated that about 154,000 homes in Harris County flooded. Bayous and tributaries across the county left their banks, and Addicks and Barker reservoirs reached record pools, flooding homes inside their own flood pools. The district also found that a little under half of the flooded homes sat outside both the 100-year and 500-year floodplains.

That last figure is the underwriting lesson. A Harris County coverage decision based on the flood map alone can understate the risk, so check the ponding layer and the address's own flood history too.

Harris County guidance stops at the county line. If your property sits just across it, the neighboring county's water behaves differently. To the southwest, the Fort Bend County insurance guide covers the Brazos River, the Richmond gauge and the levee districts that protect many of its suburbs. To the north, the Montgomery County insurance guide covers releases from Lake Conroe down the West Fork of the San Jacinto, flooding on the East Fork, and Spring Creek along much of the shared county line. In both, as here, flood risk is decided address by address.

Toward the Gulf, the wind question changes. Galveston, Brazoria and Jefferson counties are each in TWIA's coastal area as a whole county, not address by address as in Harris. The Galveston County insurance guide covers surge from both the Gulf and the bay side of the island, the Brazoria County insurance guide covers the Brazos River's final miles to Freeport, and farther east, past Chambers County, the Jefferson County (Beaumont–Port Arthur) insurance guide covers the county where the highest rainfall totals of both Harvey and Imelda were measured.

Three policies answer three different losses

Wind, rising water and everything else travel in separate contracts here. A complete property file holds each one that applies.

1. The homeowners or renters policy. Fire, theft, liability, additional living expenses and, outside the TWIA area, usually wind. It excludes flood. Additional living expenses generally depend on a covered loss, so don't count on them after excluded flooding.
2. A TWIA policy, for qualifying properties in the designated area. It covers windstorm and hail damage to the building and contents, nothing else.
3. A flood policy. Rising water: bayou overflow, ponding and surge at the bay margin. Building and contents are separate limits. An NFIP policy generally takes 30 days to take effect, so don't wait for a storm in the Gulf. Renters need their own contents coverage; the building owner's flood policy stops at the building.

Keep the declarations pages together with the effective dates aligned. A wind policy that renews in March and a flood policy that lapses in June leave a seam exactly where hurricane season opens.

Do the deductible arithmetic first

Percentage wind and hail deductibles are common along the coast, and the percentage usually applies to the dwelling limit, not the repair bill. Hypothetically, on a $350,000 dwelling limit a 2 percent deductible is $7,000 out of pocket before the policy pays; at 1 percent it is $3,500. A cheaper premium can hide a much larger cash requirement after a storm.

Settlement terms matter as much. Replacement cost pays to rebuild at current prices; actual cash value subtracts depreciation. Ask each company, and write the answers beside the premium: What rebuilding limit did you use? Which deductible applies to wind and hail, and is it a percentage or a flat amount? Does a roof payment schedule or cosmetic-damage exclusion reduce what an older roof would collect?

Cars stand in the same water

A home flood policy does nothing for the car in the driveway. Comprehensive auto coverage generally pays for flood, hail and storm damage to your own vehicle, subject to its deductible; liability-only coverage pays nothing toward it. Texas minimum liability limits, 30/60/25, set what you can pay others, not what protects your household.

Two coverages come with paperwork attached. Personal injury protection is included unless you reject it in writing, and uninsured/underinsured motorist coverage must be offered and can only be rejected in writing. Understand what each adds before signing a rejection.

Coverage follows the workforce

The Texas Medical Center, the Port of Houston and the Ship Channel plants, and the Energy Corridor along Interstate 10 supply much of the county's group health and life coverage. It is strong while the job lasts and ends on the employer's schedule at retirement or a layoff. For a Medicare review, start with your doctors, hospitals and prescriptions, then check plans by ZIP code and confirm each provider with the specific plan; one company's plans don't share one network. Medicare Advantage replaces Original Medicare's way of paying; Medigap supplements Original Medicare, not Advantage. Open Enrollment, October 15 to December 7, does not by itself give you a right to buy Medigap without health questions, so check your guaranteed-issue rights before dropping coverage. Texas HICAP gives free, unbiased counseling at 800-252-9240, and the Medicare in Texas guide lists questions to bring.

Request a coordinated comparison

Bring the exact address, current declarations, roof details, vehicle information and your coverage priorities when you start an insurance comparison. Ask for home, wind and flood costs separately where they apply. Keep existing coverage until the replacement and its effective date are confirmed in writing.

Communities and ZIP codes in Harris County

Alief, Barker, Baytown, Bellaire, Channelview, Crosby, Cypress, Deer Park, Galena Park, Highlands, Hockley, Houston, Huffman, Hufsmith, Humble, Katy, Kingwood, La Porte, North Houston, Pasadena, Seabrook, South Houston, Spring, Tomball, Webster.

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