Explore the local floodplain
Harris County’s Flood Education Mapping Tool helps you explore mapped floodplains and understand their boundaries. It is an educational resource, not an official property determination.
Houston Floodplain Map: Check a Property's Flood Zone
Buying or researching a home in the Houston area? Start here to explore mapped flood hazards, understand what the map shows, and know which questions to ask before you close.
Maps are a useful starting point. They cannot promise that any property will stay flood-free.
HARRIS COUNTY FLOOD CONTROL DISTRICT
Interactive Harris County Flood Map
Accept Harris County’s disclaimer, then search an address or use the map controls. The tool’s legend and mapped floodplain boundaries are provided by Harris County.
Skip the interactive map and open it in a new tab below ↓LAUNCH THE OFFICIAL INTERACTIVE MAPSearch an address.
Search an address.
Explore the floodplain.
Open Harris County’s Flood Education Mapping Tool to search a property, zoom and navigate the map, and explore mapped floodplain boundaries.
- Address search
- Map navigation
- Floodplain legend
Harris County Flood Control DistrictOpen Full-Screen Harris County Flood Map
The real interactive tool opens in a new tab, with Harris County’s disclaimer, legend and attribution.
Open the map in its own tab for more room.
START WITH THE MAP
Two helpful tools. Different roles.
Consult the effective flood map
FEMA’s effective Flood Insurance Rate Maps and applicable official map changes are the authoritative mapping reference. Use FEMA’s Map Service Center for official flood-map information.
View Official FEMA Flood MapsOpens FEMA’s Map Service Center in a new tab.
Outside Harris County? The county tool shows mapped floodplains within Harris County. Other Houston-area counties may require different local resources. Start with FEMA and contact the relevant city or county floodplain office.
A SIMPLE PLACE TO BEGIN
How to Check a Home's Floodplain
- Open the Harris County tool. Accept its disclaimer if prompted.
- Search the property address. Enter the full address, including city and state.
- Select Mapped Floodplains. Review the legend and the home’s location relative to mapped boundaries.
- Confirm official information. Consult FEMA’s Map Service Center, then ask an insurance agent, lender, or appropriate floodplain professional for property-specific determinations.
READ THE MAP WITH CONFIDENCE
What the floodplain labels mean
Annual-chance floodplain
The “100-year” floodplain is associated with a flood that has a 1% chance of being equaled or exceeded in any given year. It does not mean flooding happens only once every 100 years.
Annual-chance floodplain
The “500-year” floodplain is associated with a flood that has a 0.2% chance of being equaled or exceeded in any given year. It is a probability, not a timetable.
Outside a mapped boundary still carries risk
Heavy rainfall and local drainage problems can cause flooding outside mapped floodplains. A map cannot account for every future event or replace a property-specific assessment.
Confirm flood insurance requirements with your lender and insurance provider. Ask the provider for an actual premium quote; the map alone does not determine your price.
COMMON HOMEBUYER QUESTIONS
Houston floodplain & insurance FAQs
Is this Houston house in a flood zone?
Search the full address in the mapping tools above. Review FEMA’s effective map and any applicable map changes; a search marker alone is not a property-specific determination. Ask your lender, insurance agent, or local floodplain administrator to confirm the home’s designation.
Can a home flood if it's outside the mapped floodplain?
Yes. Intense rainfall, local drainage problems, and other conditions can cause flooding beyond mapped boundaries. Being outside a mapped floodplain does not mean a home is flood-free.
Does being in a floodplain mean I must buy flood insurance?
Flood insurance is generally required for buildings in a Special Flood Hazard Area when the mortgage is federally backed. Lenders may also require coverage elsewhere. Confirm the requirements for your property and loan with your lender and insurance provider.
How much does flood insurance cost in Houston?
There is no single Houston price. Premiums depend on the property’s flood risk, building characteristics, coverage, deductible, and other policy factors. Ask an insurance provider for an address-specific quote and confirm the actual premium before closing.
Does a home inspection determine flood-zone status?
No. Brad’s home inspection evaluates visible, accessible home conditions within the inspection scope. He does not issue flood-zone certifications, establish official floodplain boundaries, or guarantee future flood performance. A home inspection cannot establish a complete flood history.
Buying a Home in Houston? Know More Before You Close.
Brad Leland provides independent inspections of visible home conditions, including accessible evidence of moisture intrusion when present, within the scope of a home inspection. With more than 26 years of Houston-area inspection experience, Brad helps you understand the findings and ask informed questions.
Helpful official resources: Harris County Flood Education Mapping Tool · FEMA / NFIP flood-zone guidance. Check current effective maps and property-specific requirements when making decisions.