Valve Operation Program
Fairfax Water will begin a valve operation program
beginning April 5, 2010. The purpose of the program is to exercise main line valves
throughout the distribution system to assure reliable operation and
maintain water quality. The American Water Works Association
recommends operation of main line valves periodically to prevent
build up of deposits which may render the valve inoperable.
A main line valve is a valve which is installed at
certain points in the water main system, usually at an intersection
where the main may run in different directions or where access needs
to be controlled remotely as with a fire hydrant. The valves provide
a means of isolating small lengths of main in the event of a
necessary shut down for emergencies or maintenance. The valves are
generally in the street located under small lids covering valve
boxes, usually about 6 inches in diameter. The program will provide
an opportunity to check the condition of the valve box, as well as
all aspects of valve operation.
During this program, crews will
exercise the valves by operating the valve through a full cycle and
returning it to its normal position. Where valves are exercised, a
fire hydrant will be flowed to ensure that the water in the mains
will remain clear. All care will be taken to minimize any potential
impact on water quality. Even with these precautions, some
discolored water is possible. Flushing may result in some temporary
discoloration and the presence of sediment in your water. These
conditions are not harmful and should be of short duration.
If you have questions about this program or the work being conducted
in your area, you may call Customer Service any time of the day
or night at 703-698-5613, TTY 711.