Public Works and Environmental Services

CONTACT INFORMATION: Our administrative offices are open 8 a.m. – 4:30 p.m., Mon - Fri
703-324-5500 TTY 711
12000 Government Center Parkway
Suite 449, Fairfax, Va 22035
Joni Calmbacher
Director, Stormwater Planning

Dam and Flood Safety

This page provides flood warning information and dam break flood warning to the residents who live in or near a dam inundation zone i.e., areas that may flood if a dam fails. Property that is in a dam break inundation zone is at risk of flooding. Flooding is the most common natural disaster in the United States and may occur at any time.

Flood and Emergency Warning Systems

Fairfax Alerts delivers emergency information to county residents before, during and after a crisis and provides notices about severe weather and traffic congestion. Messages are delivered to all devices registered and may include email, cell and home phones, pagers and other wireless devices.

Register for emergency alerts from Fairfax County at

Fairfax Alerts

The official Fairfax County emergency preparedness, response and recovery blog.

Sign up to receive blog alerts and updates at Fairfax County Emergency Information.

There are important safety measures that residents and business owners should take in preparation for a flood that include planning, preparing and mitigating. Make a plan before there is an emergency. Build an n emergency kit for yourself and your family. Don’t forget your pets.

Learn more at Fairfax County Emergency Information or Floods |

Fairfax Virtual Assistant