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SwiftPro tests and repairs backflow preventers in Fairfax Station, and the yearly test is $250 a home (normally $300). Call SwiftPro, rated 5.0 stars across 1,130 reviews, at (703) 997-9757, 24 hours a day, 7 days a week.
SwiftPro’s plumbers in Fairfax Station are rated 5.0 stars across 1,130 reviews and work under Virginia Class A contractor license 2705192276. Fairfax Station backflow testing, Crosspointe cul-de-sacs to the well lots off Ox Road: device tested, repaired if it fails, report filed with the County. Book it at (703) 997-9757 or online. We’re rated 5.0 stars across 1,130 reviews, and we set the visit around the date on your notice.
5.0 stars across 1,130 reviews
Our plumbing team in front of three of our vans.
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Licensed and insuredVirginia Class A contractor #2705192276
24/7 emergency serviceWe answer day or night, and we will tell you honestly when we can get there.
Our own plumbers, our own trucksNobody here is a subcontractor with a magnet on the door
The price is settled before the workYou see the number in writing before anything is taken apart
What it costs
The yearly test is $250 a home, normally $300, and you can pay for it online. HOA and condo communities that book their units together pay $175 to $225 a unit. A new preventer, installed and tested, runs $800 to $1,200. Those are for a home’s device up to 1 inch; where an HOA unit or a new preventer lands in its range is set at the house and quoted before we start.
Yearly backflow test, one home
$250 (normally $300)
HOA or condo units booked together, per unit
$175 to $225
New backflow preventer, installed and tested
$800 to $1,200
Repair or rebuild after a failed test
Priced in writing before any work
Prices checked .
A device that fails is priced in writing before any work. Most can be rebuilt with new springs, seats or rubber parts; a body cracked by a freeze gets replaced. Either way it’s tested again afterward, which Virginia requires.
Booking for an HOA, townhouse or condo community? Here’s what each unit pays when the community books one visit. And what a backflow test costs covers what moves the price up or down.
What’s different in Fairfax Station
Fairfax Station is almost all single family homes, about 98% detached and most with four bedrooms or more, and roughly 1,700 parcels in 22039 have an active well. Nearly all of them sit west of Ox Road, along Hampton, Fairfax Station, Henderson, Wolf Run Shoals and Yates Ford Roads. On those lots the backflow rule that matters most isn’t the sprinkler test. It’s that a private well and Fairfax Water’s line can never be connected, not even through a valve.
When a well house switches to public water, Fairfax Water gives two routes. One is abandoning the well, with a Health Department review. The other is its Lawn Irrigation Well Procedure: the well stays, but only for the sprinklers, capped off from the house, with photos of the capped piping and the new water connection sent in and a final plumbing inspection before the meter goes on. If your sprinklers still run off the old well, find out which route the house took.
Big lots also mean a frost-proof yard hydrant out by the barn, the garden or the paddock. Fairfax Water treats those as a backflow risk because of the drain hole at the bottom. On public water, a yard hydrant needs a backflow assembly ahead of it, an RPZ in Fairfax Water’s guidance, plus a permit, an inspection and a test report before it’s used, then a yearly test like any other device.
Crosspointe and South Run are the other half of Fairfax Station: public water and sewer, most homes built between 1980 and 1999, and plenty of sprinklers and pools. Around Crosspointe Drive the County’s tax map grid puts the test in April, right as sprinklers come back on, so one visit can cover both. Our Fairfax County backflow testing page has the countywide side.
Neighborhood by neighborhood
Census figures for the owner-occupied homes in each place, and what usually brings the test notice to houses like these.
| Place | Median home built | Most homes are | Heated with | What usually needs the test |
|---|---|---|---|---|
| Fairfax Station | 1982 | single-family houses, about 9 in 10 | gas, about 5 in 10 | Sprinklers added by an owner, pools and hot tubs. |
| South Run | 1988 | single-family houses, nearly all | gas, about 9 in 10 | Sprinklers added by an owner, pools and hot tubs. |
| Crosspointe | 1993 | single-family houses, nearly all | gas, about 8 in 10 | Sprinklers added by an owner, pools and hot tubs. |
By the numbers
From the Census Bureau’s 2020 to 2024 survey, owner-occupied homes unless it says otherwise.
ZIP 22039 as a whole: every Fairfax Station address. The Fairfax Station Census place in the table also takes in streets with Fairfax mail.
When it’s time
If you bought a house that went from well to public water, the old pressure tank and well piping may still be in the basement. Make sure nothing ties them back into the house water. That’s the exact cross connection Fairfax Water’s rules are written against.
Anything piped to the water supply that could push water back into it gets a device: lawn sprinklers, a pool fill line, a hot tub. More yard usually means more of them.
A letter from the water utility with a date on it means there’s a testable device on your line, usually on the lawn sprinklers, and its test is due.
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Before the first hard freeze
A device that sits full of water all winter is the most common reason it fails the spring test. Around here, get this done by the end of October.
On most houses it’s outside by the foundation: a brass valve on two pipes standing out of the ground, with a cap on top. That’s a PVB. An RPZ or double check may sit in a basement or a box in the ground instead.
Turn off the valve that feeds the sprinklers, usually in the basement or utility room just past the main shutoff. Leave the rest of the house on.
Most systems here get blown out with compressed air so nothing sits in the lines or the device. If yours hasn’t been, that’s the step that matters.
Set the device’s two shutoff handles and its little test cocks about halfway, near 45 degrees, so no pocket of water stays trapped inside to freeze.
An insulated cover helps a PVB through the winter. On an RPZ, never block the relief valve opening underneath: it has to be able to dump water.
Some owners bring the device inside for the winter. Check the rules first: Loudoun Water wants a device that came off tested again when it goes back on, and Fairfax County wants it back on before your testing month.
Not sure it was drained, or saw water coming from the cap when the sprinklers ran? Call us. We’ll look at it, and if it cracked, you get the reason and a price before anything gets replaced.
Who sends the notice
Fairfax County’s Cross Connection Program wants testable backflow devices on lawn sprinklers, fire sprinklers, pools and hot tubs tested every year by a tester on the County’s Authorized Vendor List. The tester files the report and the County emails you when it’s in; nothing after 14 days, and the County asks you to check with them. Source.
Each property gets its own testing month from the County’s tax map grid, and the report is due before that month ends. A device that fails has to be repaired or replaced and retested within 10 business days of the failed test, and one taken off for the winter goes back on before the testing month. Source.
Our Virginia Class A contractor license, 2705192276, is on the side of the van.
Choosing a tester
Questions to ask anybody who offers to test it, us included.
On a lot with a well and public water, a good tester looks past the sprinkler device to the well piping, the yard hydrant and anything else that touches both. That’s where a cross connection usually hides.
Since January 1, 2023, Virginia only accepts tests from a DPOR-certified Backflow Prevention Device Worker, and some places keep a list of their own on top. Ask to see the certificate before the gauge goes on.
Some utilities take it from the tester and some want it from you. Ask which, and keep a copy either way, so you can show the date if a second notice turns up.
Ask for the reason and a written price before anything gets taken apart, and whether the retest is part of it. A failed device runs on a deadline, so a tester who can also fix it saves you a second trip.
Two of our crew going over a work order before the day's calls.
From our Google reviews
5.0 stars across 1,130 reviews. Read them on our reviews page.
Tyson was wonderful; professional, very knowledgeable, thorough and fast. He was great at telling me about what was needed, and I very much appreciated that. For the next plumbing problem we have, I will have SwiftPro on speed dial.
Where we work
Next door to Fairfax Station: Burke, Springfield, Fairfax, Annandale and Lorton.
Questions
It can, under Fairfax Water’s Lawn Irrigation Well Procedure. The well gets reclassified as irrigation only and cut off from the house. Photos of the capped well piping and the new service go to Fairfax Water, and the plumbing passes a final inspection before the meter is set.
On Fairfax Water, yes. The drain hole that keeps it from freezing can also pull dirty water back in, so it needs a backflow assembly upstream, a permit, an inspection and a test report before use.
SwiftPro does, all over Fairfax Station. We test the backflow preventer on your sprinkler system, fire line or pool in about 30 minutes, repair it on the same visit if it fails, and get the report where your water utility wants it. Call (703) 997-9757 or book online.
The yearly test is $250 a home, normally $300, and you can pay for it online. HOA and condo units booked together on one visit run $175 to $225 a unit. A new preventer, installed and tested, is $800 to $1,200. Where an HOA unit or a new preventer lands in its range is set at the house and quoted before we start, and a device that fails is quoted in writing before any repair. More in what a backflow test costs.
About 30 minutes a device. The water is off for a few of those minutes while the gauge readings are taken.
Ready when you are
Call, or send the form at the top. Have the notice handy: how many devices it lists and the date on it are what we need. Or pay $250 online and we’ll call to pick the day.
SwiftPro Heating, Cooling & Plumbing
4230 Lafayette Center Dr N, Chantilly, VA 20151
44679 Endicott Dr, Suite 211, Ashburn, VA 20147
SwiftPro Plumber & Water Heaters
4200 Lafayette Center Dr, Suite N, Chantilly, VA 20151
Virginia Class A contractor license #2705192276
SwiftPro Heating, Cooling & Plumbing is a licensed, BBB Accredited (A rating), independently owned heating, cooling and plumbing company in Chantilly, serving Fairfax Station and the rest of Northern Virginia. Virginia contractor license #2705192276. 5.0 stars across 1,130 reviews on Google, Angi, Yelp, the BBB and Facebook. SwiftPro maintains a dedicated HVAC team and a dedicated plumbing team.
From SwiftPro Heating, Cooling & Plumbing in Chantilly. Housing figures are the Census Bureau’s American Community Survey, 2020 to 2024, for each place named; permit, water and sewer facts link to each office’s own page and were checked in September and October 2026.