Flood damage is the main type of natural disaster damage not covered by a standard home insurance policy. Floods are only covered if you purchase separate flood insurance through the National Flood Insurance Program or a private insurer. Without flood coverage, water damage from events like flash floods, storm surges or overflowing rivers would not be covered. Hurricane and tropical storm damage is covered under standard policies unless flooding is the main cause of damage. Earthquakes are also typically excluded from most insurance policies.