Moderate Risk Texas  ·  Flash Flooding

Williamson County TX

EMERGENCY PREPAREDNESS & DISASTER RISK PROFILE  ·  LAST UPDATED: Mar 2026

6/ 10
Threat Score
Population
769,954
Area
1124
sq miles
Primary Hazard
Flash Flooding
FEMA Disasters
26
federally declared

Williamson County north of Austin combines flash flood risk from the Balcones Escarpment with increasing tornado exposure. As one of the fastest-growing counties in Texas, new residential developments are expanding into flood-prone areas, raising emergency management challenges for local officials.

// Preparedness Recommendations

  • Evacuation routes inland should be identified in advance.
  • Store at least 72 hours of food and water.
  • Elevate critical belongings above flood level.
  • Have backup power ready in case of grid failure.

// Recommended Supplies

Essential gear for power outages, severe weather, and emergency situations in your area.

// Risk Intelligence

Threat Score 6 / 10    Moderate Risk
Primary Hazard Flash Flooding
Secondary Hazard Tornado
FEMA Flood Zone Zone AE (Moderate Risk)
Federally Declared Disasters 26
Last Major Event Flash Flood (2021)
Event Frequency Major event every 5–6 years

// Emergency Operations

Emergency Mgmt Phone (512) 943-1700
Emergency Shelters 19 designated facilities
Evacuation Routes I-35 North, TX-130 North, TX-29 West

// County Profile

County Williamson County TX
State Texas (TX)
Population 769,954
Area 1124 sq miles
FEMA Region Zone AE (Moderate Risk)

// Major Cities

Cedar Park TX Georgetown TX Round Rock TX

// Cities in This County

// Other Texas Counties

// Nearby Infrastructure Risks

Critical infrastructure facilities within or near this area that could affect civilian safety during emergencies, conflict, or infrastructure failures.

ERCOT Grid Control Center Taylor TX
Power Plant  ·  Taylor, TX  ·  Electric Reliability Council of Texas  ·  5-mi risk zone
9/10 Critical
Fort Cavazos TX
Military Installation  ·  Killeen  ·  US Army / III Corps  ·  25-mi risk zone
7/10 High

Infrastructure risk data is for emergency preparedness awareness. Facility locations are publicly known. Always follow official emergency guidance.