Open 24/7 for emergencies
SwiftPro tests and repairs backflow preventers in Triangle, 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 Triangle are rated 5.0 stars across 1,130 reviews and work under Virginia Class A contractor license 2705192276. We cover backflow testing in Triangle, 22172, from the 2000s streets off Kerill Road to the 1950s blocks near Route 1, with the report sent to Prince William Water. 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 Triangle
Triangle was built in two waves, and the backflow devices follow them. Nearly half its homes went up in 2000 or later, with the median owner’s house from 2003, in subdivisions like Kerill Woods, Stonewall Manor, Cramers Ridge and Garrison Woods. Builders then often put the lawn sprinklers in with the house, a PVB by the foundation included, and that device is what Prince William Water writes to you about each year. The first of them are close to two decades old, which is when tired rubber parts start to show on the gauge.
The older half is another story. About one Triangle home in six predates 1960: Carborough Heights was recorded in 1946, Mockingbird Heights in 1950, and Melrose Gardens, the attached rows on Purvis Drive and Melrose Avenue, in 1953. Nobody piped sprinklers into a front lawn back then, so a letter on one of those streets almost always traces to a system somebody added later.
Out past the subdivisions, the utility’s pipes thin out. Measured on Prince William Water’s own map, none of the 21 houses the county lists on Johnson Road sits within 200 feet of one of its water lines, only 2 of 18 on Williams Road do, and on Joplin Road it’s fewer than two in five. The utility only tracks devices hooked to its system, so a house it doesn’t supply won’t get the yearly letter. The county still wants a device on any lawn sprinkler system out there, since what it protects is the drinking water inside your own house.
Port O’Dumfries is the other edge. Those townhouses have Triangle mail but sit inside the Town of Dumfries, which runs its own building department, so permit questions about a new device go to the Town instead of the County. The water, and the yearly letter, still come from Prince William Water. Our Prince William County backflow page has the county rules in one place.
By the numbers
From the Census Bureau’s 2020 to 2024 survey, owner-occupied homes unless it says otherwise.
When it’s time
At the Quantico air station, about four miles away, half of all years see the first freezing night by November 8. A PVB still holding water by then can split without a sound and leak from the cap in April. Have the sprinklers blown out before the calendar turns to November.
In a newer subdivision the builder often put in the lawn sprinklers, and the backflow device with them. Nobody tells the next owner it needs a test every year until the first notice shows up.
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.
Need backflow testing in Triangle?
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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
Prince William Water mails a notice when a device comes due each year. Its test report form is made for the tester to send in, but the owner gets a copy of the approved results and is responsible for getting the forms to the utility’s Cross Connection Coordinator. Source.
County code says every lawn sprinkler system needs a backflow device, and a system winterized with antifreeze can only use an RPZ. 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.
More than a third of Triangle households rent, and Prince William Water mails its notice to the owner or whoever it has on file as responsible. If you own a rental here, ask that the report come straight to you, with a copy left for whoever lives there, so the next letter doesn’t sit unopened on a counter.
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.
Zabi helped us with a complex plumbing problem. He explained clearly the problem and gave us various repair options. He is courteous, professional and highly experienced. We recommend him!
Where we work
Next door to Triangle: Dumfries, Woodbridge, Lorton and Fairfax Station.
Questions
If it was built in the 2000s with sprinklers, very likely, usually a PVB beside the foundation. If it dates from the 1940s to the 60s, only if somebody added sprinklers, a pool fill or something similar later. No sprinklers usually means nothing to test and no letter.
No. Liberty Military Housing owns and maintains family housing aboard Marine Corps Base Quantico, so a question about a device there goes to Liberty or the base’s Family Housing Office. Off base, anywhere with Triangle mail, we’ll test it.
SwiftPro does, all over Triangle. 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 Triangle 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.