Most Oakton homes are on Fairfax Water, whose cross-connection program with Fairfax County requires irrigation backflow assemblies to be tested when installed, every year, and again whenever they are repaired or replaced. Some addresses near Vienna are on Town of Vienna water instead. For a test or a repair, call the number on this page to be connected with a local plumber in Oakton.
What happens when you call
Your call goes to an independent plumber who works in Oakton. Tell them which utility bills you for water, what the assembly protects and when it was last tested, if you know. Ask them to confirm they hold the DPOR backflow certification and are on Fairfax County's authorized list. If the device is pouring water, close the irrigation shutoff or the main before they arrive.
The test itself is short when the assembly is healthy: gauge hoses go on the test cocks, valves are closed in order, and readings are recorded. If something fails, the plumber explains whether a rebuild will do or the unit needs replacing.
What affects the cost
- Passing or failing. A failed check or relief valve brings parts, labor and a second test.
- Assembly type. Reduced pressure assemblies take longer than pressure vacuum breakers.
- Permit work. A replacement irrigation assembly needs a County plumbing permit.
- Access. Devices tucked into mature landscaping or tight corners take more time.
Local conditions in Oakton
Oakton is a fully suburban, unincorporated community between the City of Fairfax and Vienna, around I-66 and Route 123, with a median home built in 1983. Fairfax County lists Fairfax Water as the provider for county residents, drawing on the Occoquan Reservoir and the Potomac River. Fairfax Water's cross-connection department, at 571-722-7653, works with Fairfax County Land Development Services on the program, and permits for new plumbing work are filed through the County's PLUS system.
The wrinkle is Vienna. The Town of Vienna's water system serves customers beyond its limits, and some Oakton homes near the town are Vienna water customers. If your bill comes from the Town, ask Vienna's Water and Sewer customer service (703-255-6385) about its backflow expectations before scheduling. Either way, the device belongs to the homeowner, and freeze damage is the most common reason one fails outright after a cold winter.
Checklist before the visit
- Confirm whether Fairfax Water or the Town of Vienna sends your water bill
- Switch off the sprinkler controller
- Locate the irrigation shutoff valve indoors
- Clear plants and mulch from around the assembly
- Have any past test report or notice ready
Backflow Testing questions in Oakton
How can I tell which water utility serves my address?
How often does a backflow assembly need to be tested here?
What happens if the assembly fails its test?
Is a permit needed to install or replace a backflow preventer?
More plumbing services in Oakton
Backflow Testing nearby
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