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SwiftPro tests and repairs backflow preventers in Dumfries, 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 Dumfries are rated 5.0 stars across 1,130 reviews and work under Virginia Class A contractor license 2705192276. We cover backflow testing in Dumfries, in the Town’s older neighborhoods and out in Montclair, Southbridge and Cherry Hill, with the report filed with 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 Dumfries
The Town of Dumfries is a townhouse town. Williamstown, Port O’Dumfries, South Cove and Knolls of Dumfries add up to nearly a thousand attached homes built between 1974 and 1999, in years when builders here seldom put in sprinklers. A townhouse in one of those rows almost never has a testable device of its own. If a Prince William Water notice shows up at one, check whether it’s addressed to the association or to a past owner who added something to the back yard.
The single-family streets are where in-town devices hide. Tripoli Heights was built from 1950 to 2008 and Whitehaven from the 1930s on, house by house, so a sprinkler system there is whatever one owner decided to add, and the next owner may not know it’s on the books. A new device inside the town line is a permit question for the Town’s own building department at Town Hall, not the County’s.
Over the line on the county side, the picture flips. In Cherry Hill, the Census place that takes in most of the newer ground, more than half the homes went up in 2000 or later, and that’s where builder sprinklers, and the yearly letter, are most common. Montclair sits between: mostly detached, median 1989, about three homes in ten from the 2000s. County code covers every sprinkler system on that side, and on a PVB the fall blowout has to be air, not antifreeze.
Cherry Hill is also four homes in ten townhouses and one in five condos, so a lot of its devices belong to an association that books its units together. If yours does, the HOA backflow guide explains how a community test works. Either side of the line, the report is the owner’s job to see through, so keep the approved copy.
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 |
|---|---|---|---|---|
| Montclair | 1989 | single-family houses, about 8 in 10 | electricity, about 5 in 10 | Sprinklers added by an owner, pools and hot tubs. |
| Cherry Hill | 2005 | townhouses, about 4 in 10 | gas, about 7 in 10 | Mostly the association’s sprinklers, plus any yard system an owner added. |
| Dumfries | 1985 | townhouses, about 4 in 10 | electricity, about 5 in 10 | Mostly the association’s sprinklers, plus any yard system an owner added. |
By the numbers
From the Census Bureau’s 2020 to 2024 survey, owner-occupied homes unless it says otherwise.
Nearly all of the Town sits in 22026, with a sliver in Triangle’s 22172. None of it is in 22025.
Montclair in 22025, where the Postal Service accepts Montclair as the town name; Southbridge and Cherry Hill in 22026, outside the town line.
ZIPs 22025 and 22026 as a whole: Montclair, Cherry Hill and the rest of Dumfries mail, the Town’s homes included.
When it’s time
About one home in five in the Town and close to two in five in Cherry Hill are rented, and the notice goes to the owner of record. If your tenant handles the yard, ask them to pass along anything from Prince William Water before the date on it slips by.
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.
On an RPZ, a little water when the pressure jumps can be normal. A steady stream from the opening underneath means a check valve isn’t sealing, and it won’t pass.
Need backflow testing in Dumfries?
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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.
In a place this mixed, the first question is whether the device on your notice is yours or the association’s. A good tester reads the location and serial number off the notice and checks it against what’s at your house before charging you to test somebody else’s.
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 Dumfries: Triangle, Woodbridge, Lorton, Fairfax Station and Manassas.
Questions
Not necessarily, but check. The rows there were built from 1974 to 1991 without their own sprinklers, so a device on your record usually means a past owner added irrigation, a pool fill or something similar. Look outside by the foundation and inside near the main shutoff before you book.
Plumbing permits inside the town limits come from the Town’s building department, which enforces the state building code itself, so ask there rather than at the County. On the county side, in Montclair or Cherry Hill, a sprinkler device goes through Prince William County.
SwiftPro does, all over Dumfries. 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 Dumfries 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.