County · Flood Risk
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SFHA Coverage
~20%
Concentrated along Brazos River floodplain and coastal lowlands
Harvey Claims Filed
~15,000
Moderate impact from Brazos River flooding and coastal surge
Active Flood Gauges
20+
Monitored by Brazoria County, Brazos River Authority, and USGS
Primary Watersheds
Brazos River, San Bernard River, Oyster Creek
Two major rivers drain through the county to the Gulf
Municipalities
Pearland, Lake Jackson, Alvin, Angleton, Clute
Northern Pearland is the most densely populated area
Infrastructure
Drainage district projects
Brazoria County drainage improvements and Brazos River levee upgrades
Yes, if your property is in a FEMA Special Flood Hazard Area (zones AE, A, VE) and you have a federally backed mortgage. About 20% of Brazoria County is in high-risk zones, concentrated along the Brazos River, San Bernard River, and coastal lowlands. NFIP premiums under Risk Rating 2.0 typically range from $550 to $3,500 depending on elevation and proximity to waterways.
Brazoria County has invested in drainage district channel improvements, Brazos River levee reinforcements, and new detention basins near Pearland and Alvin. The county also partnered with the Brazos River Authority on upstream flow management. Oyster Creek conveyance projects in the northern county are reducing backwater flooding that affected Pearland neighborhoods during Harvey.
Yes. FEMA's MAAPnext program is incorporating updated rainfall models, LiDAR elevation data, and revised Brazos River hydrology into new preliminary maps. Properties in Pearland near Oyster Creek and Clear Creek may see zone shifts, and coastal areas near Surfside Beach and Freeport could see VE zone expansions based on updated storm surge modeling.
The Brazos River crested at record levels, flooding rural areas and communities west of Angleton. Pearland experienced significant flooding along Oyster Creek and Clear Creek tributaries. Alvin recorded over 20 inches of rain. Brazoria County filed approximately 15,000 FEMA damage claims, with estimated property losses exceeding $1.2 billion across the county.
Search your address on FloodMaps for a free instant lookup showing your official FEMA flood zone, ground elevation, and parcel elevation profile. For the full analysis including Brazos River flood depth modeling, Harvey damage records, subsidence data, and an AI-generated risk score, upgrade to a Premium Report starting at $29.
Brazoria County stretches from Pearland south to the Gulf Coast, encompassing the Brazos River and San Bernard River floodplains along with coastal communities near Surfside Beach and Freeport. Approximately 20% of the county lies within FEMA Special Flood Hazard Areas, with Zones AE and A concentrated along the two major river corridors and VE zones along the coastline. With both riverine and coastal flood exposure, property-level risk data is essential for homebuyers and real estate professionals evaluating Brazoria County properties.
FloodMaps integrates FEMA National Flood Hazard Layer data with USGS 3DEP LiDAR elevation models, Brazos River Authority gauge readings, Hurricane Harvey damage records, and Brazoria County drainage district project data to deliver a comprehensive property-level flood risk assessment. Premium Reports include AI-analyzed risk scores, parcel elevation profiles, subsidence trends, and Brazos River flood depth modeling.
Whether you're buying in Pearland, evaluating waterfront property near Lake Jackson, or advising clients on Brazoria County real estate, understanding flood risk at the address level is critical — especially given the county's dual exposure to Brazos River flooding and Gulf Coast storm surge. Search your address on FloodMaps to get started with a free flood zone lookup.