To further ensure the safety of the residents, visitors and businesses along the Occoquan River shoreline, Fairfax Water installed sirens to warn people in the highly unlikely event that there is ever a massive failure of the Occoquan River Dam.


Who's impacted?



The impact zone includes areas in Prince William County & Fairfax County located immediately adjacent to the Occoquan River from the Town of Occoquan to Belmont Bay. This includes the town, marinas, Occoquan Regional Park, and other residences and businesses adjacent to the river.


What does the siren sound like?



The siren is a loud whooping noise. You can hear what it sounds like by clicking here.


How do I know if I'm in the impact zone?



Just because you hear the siren does not mean you are in the impact zone. Find out whether or not you are in the impact zone or the noise zone by clicking here.


What should I do?



If you hear the siren and are in the impact zone, seek higher ground immediately!

If you are not in the impact zone, no action is necessary.




Questions about the sirens can be submitted to Fairfax Water by email. Please click here to submit a question.