Annual Occoquan Dam Siren Test - Tuesday November 18th

Fairfax Water will be conducting the annual Occoquan Dam Siren Testing on Tuesday Nov. 18, 2025, at 10 am. The test should only last approximately five minutes. During the test no action is needed on the part of residents and business owners in the area.
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    The County’s Office of Emergency Management coordinates efforts to ensure that the County is able to mitigate against, prepare for, respond to and recover from any type of natural or human-caused disaster. The County uses an all-hazards approach to emergency preparedness, which means that planning efforts consider all types of disasters that could occur in the County. Emergency Management resides under the Department of Fire and Rescue.

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    map
    3 County Complex Ct.
    Prince William, VA 22192
    phone
    (703) 792–7050 (TTY: 711)
    8:00 AM - 4:00 PM M-F
    Brian Misner
    Brian Misner
    Emergency Management Coordinator