How to prepare your Houston home for flood season

Houston floods. It is not a matter of if but when. The flat topography, clay soils with poor drainage, network of bayous, and proximity to the Gulf of Mexico make flooding the most consistent natural threat to Houston homeowners. Hurricane Harvey in 2017 dropped over 60 inches of rain on parts of Harris County. The 2016 Tax Day Flood, the 2015 Memorial Day Flood, Tropical Storm Imelda in 2019, and regular spring thunderstorms all show that serious flooding can happen in any year, in any month.

Preparation does not eliminate risk, but it can cut damage and recovery time significantly. Here is a practical guide written for Houston’s flood reality.

Know your risk level

Not all Houston neighborhoods face the same flood risk. Start by understanding yours:

• Check the FEMA flood map: Search your address at the Harris County Flood Control District website (hcfcd.org) to see if you are in a 100-year floodplain (Zone A/AE), 500-year floodplain (Zone X shaded), or outside mapped flood zones.
• Look beyond the map: Harvey proved that FEMA maps do not tell the whole story. Over half of the homes flooded during Harvey were outside mapped flood zones. If you live near Buffalo Bayou, Brays Bayou, White Oak Bayou, Sims Bayou, or any of their tributaries, your risk is higher than the map may say.
• Ask your neighbors: Long-time residents know which streets and blocks have history. The homes that flooded in Harvey, the Tax Day Flood, and the Memorial Day Flood are the ones most likely to flood again until watershed-level improvements are finished.
• Understand your elevation: Request an elevation certificate for your home. It shows your finished floor height relative to the base flood elevation (BFE). If your floor is below the BFE, your risk is real.

Buy flood insurance before you need it

Standard homeowners insurance does not cover flooding. If you do not have a flood insurance policy, get one now. Key facts:

• NFIP policies have a 30-day waiting period. You cannot buy one when a storm is on the way.
• Maximum coverage: $250,000 for the structure, $100,000 for contents
• Private flood insurance may offer higher limits, shorter waiting periods, and sometimes lower premiums
• If you are in a high-risk zone with a federally backed mortgage, flood insurance is required. Even if it is not required, it is strongly recommended for any Houston home.
• The average NFIP claim paid in Harris County after Harvey was about $113,000

Protect your home’s exterior

Your home’s first line of defense is its exterior and the grading around it:

• Grade the landscape away from the foundation: The ground should slope at least 6 inches over the first 10 feet from your foundation. Houston’s clay soils compact and settle over time, often creating a reverse slope that funnels water toward the house.
• Clean and maintain gutters: Houston’s pine and oak canopy drops a lot of debris. Clogged gutters overflow directly against the foundation. Extend downspouts at least 3-4 feet from the house.
• Install backflow valves: A backflow prevention valve on your main sewer line prevents sewage from backing up into your home when the city’s storm drain system is overwhelmed. This happens regularly during Houston flood events.
• Seal foundation penetrations: Where utility lines enter through the foundation wall, make sure the penetrations are sealed with hydraulic cement or polyurethane caulk.
• Consider a sump pump: For pier-and-beam homes in the Heights, Montrose, or older neighborhoods with crawlspaces, a sump pump with battery backup provides active water removal during heavy rain events.

Prepare the interior

• Elevate valuable items: Store important documents, photo albums, electronics, and irreplaceable items on upper shelves or the second floor. Consider a waterproof safe for critical documents.
• Know your shut-offs: Every member of the household should know where to find the main water shutoff, the gas meter shutoff, and the electrical panel. Label them clearly.
• Keep an emergency supply kit: Water, flashlights, batteries, first aid supplies, medications, phone chargers, and copies of insurance documents in a waterproof bag.
• Photograph your belongings: Walk through your home with a video camera and record every room, including inside closets and cabinets. Store the footage in the cloud. This creates a pre-loss inventory that makes insurance claims much simpler.
• Install water leak sensors: Battery-powered sensors placed near the water heater, under sinks, near the washing machine, and near the HVAC air handler can alert you to leaks before they become disasters. Many models connect to smartphone apps for remote alerts.

When a flood watch or warning is issued

Houston’s flood events can develop fast. When the National Weather Service issues a flood watch or warning for Harris County:

1. Move vehicles to higher ground: parking garages, elevated lots, or streets on higher terrain
2. Move valuables from the first floor to the second floor or to high shelves
3. Sandbag doorways and garage entries if you have sandbags available (the City of Houston distributes free sandbags before major storm events; check houstonemergency.org for locations)
4. Fill bathtubs with clean water in case the water supply is disrupted
5. Charge all devices and portable batteries
6. Do not drive through flooded roadways. “Turn around, don’t drown” is not a slogan, it is survival advice. More Houston flood deaths happen in vehicles than in homes.

After the water recedes

The most important thing you can do after floodwater recedes is call for professional extraction and drying right away. Floodwater is Category 3 (black water). It contains sewage, chemicals, petroleum products, agricultural runoff, and biological contaminants. Every hour it stays in contact with your home’s structure increases the scope and cost of restoration.

Do not assume the damage is limited to what you can see. Floodwater wicks up through drywall, saturates insulation in wall cavities, and soaks into wood framing. In Houston’s heat and humidity, mold can start growing in these hidden areas within 24-48 hours.

Long-term flood resilience

If your Houston home has flooded before or is in a high-risk area, consider longer-term measures:

• Elevation: Raising the home above the base flood elevation is the most effective long-term protection. Harris County and FEMA offer grants that can cover a significant portion of the cost for qualifying properties.
• Flood-resistant materials: When rebuilding after a flood, specify materials that resist water damage: tile or sealed concrete flooring instead of hardwood, cement board instead of paper-faced drywall in the lowest 2-4 feet, and closed-cell spray foam insulation instead of fiberglass batts.
• Elevated utilities: Raise the water heater, HVAC system, electrical panel, and washer/dryer above historical flood levels. This prevents the most expensive single items in a flood loss from being damaged.