County · Flood Risk
FloodMapsGet a detailed flood report of any Houston property
SFHA Coverage
≈30% of land area
Largest SFHA footprint in Texas
Harvey Claims Filed
89,000+
Highest single-county total in U.S. history
Active Flood Gauges
150+
Monitored by HCFCD across bayou network
Primary Watersheds
22 major bayous
Buffalo, Brays, White Oak, Greens, and more
Municipalities
34 cities & towns
Including Houston, Bellaire, Pasadena, Baytown
Bond Program
$2.5B approved
2018 Harris County Flood Control bond
No, only properties in FEMA Special Flood Hazard Areas (Zones A, AE, V, VE) with federally backed mortgages are required to carry flood insurance. However, roughly 30% of Harris County’s land area falls within these high-risk zones. FEMA data shows that 25% of all flood claims nationwide come from outside high-risk zones, so coverage is strongly recommended countywide.
Significantly. Voters approved a $2.5 billion bond in 2018 for the Harris County Flood Control District, funding 237 projects including channel widening, new detention basins, and home buyouts in repetitive-loss areas. Over 100 projects are completed or under construction as of 2026, with the full program expected to finish by 2033.
Yes. FEMA’s MAAPnext program is releasing updated preliminary flood maps for Harris County incorporating new rainfall models, LiDAR elevation data, and post-Harvey infrastructure changes. Many properties will see zone reclassifications — some moving into higher-risk zones, others seeing reduced risk due to completed HCFCD detention projects.
The hardest-hit areas include neighborhoods along Brays Bayou (Meyerland, Braeswood Place), Buffalo Bayou (Memorial, River Oaks), Cypress Creek (Cypress, Spring), and the San Jacinto River (Kingwood). Harris County recorded over 89,000 FEMA flood damage claims — more than any single county in U.S. history from a single weather event.
Search your address on FloodMaps for a free instant lookup showing your official FEMA flood zone designation, ground elevation, and neighborhood elevation profile. For a complete picture including AI-analyzed risk score, Harvey damage records, subsidence data, and flood depth modeling, upgrade to a Premium Report starting at $29.
Harris County is the most flood-prone county in the Greater Houston metro area and one of the most actively monitored in the United States. With roughly 30% of its land area within FEMA-designated Special Flood Hazard Areas and a bayou network draining 22 major watersheds, understanding flood risk at the property level is critical for homeowners, buyers, and real estate professionals.
FloodMaps combines official FEMA National Flood Hazard Layer (NFHL) data with USGS 3DEP high-resolution LiDAR elevation models, Harris County Flood Control District infrastructure data, Hurricane Harvey damage records, and live Houston 311 flood reports to give you a property-level picture of flood risk — not just a zone-level overview.
Whether you’re evaluating flood insurance requirements, doing pre-purchase due diligence, or advising clients on Harris County properties, understanding the specific flood risk profile at the address level is essential — especially given Houston’s history of major flood events including Hurricane Harvey, Tropical Storm Allison, and the 2016 Tax Day floods.