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SwiftPro tests and repairs backflow preventers in Middleburg, 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 Middleburg are rated 5.0 stars across 1,130 reviews and work under Virginia Class A contractor license 2705192276. Backflow testing in Middleburg on Town water: the device tested before the Town’s May 1 date, repaired if it fails, and the signed form in your hands to send. 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 Middleburg
Inside the corporate limits, the Town of Middleburg is the water company, and it wants a yearly inspection by May 1 on any property that could backflow into Town water. Two things catch newer owners. The Town keeps no tester list of its own; its backflow page sends you to the lists Loudoun Water and the Town of Leesburg keep. And once the test is done, the signed form comes back to you to send in, by email or the Town’s online form, and Loudoun Water’s PDF report is accepted too. If it never arrives, the Town can shut the water off.
The Town’s list runs past lawn sprinklers: swimming pools, yard hydrants, fire sprinklers, booster pumps and storage tanks, and softeners and filters. Your water heater is the one tank it leaves off. The softener is the easy case. A house whose only item is a softener or a whole house filter needs a check valve on that line, the Town sees proof of it once, and there’s no yearly test after that.
Middleburg’s lots are old and roomy. About a third of the homes in 20117 went up before 1960, and eight in ten are detached houses, so a yard hydrant out by a garden or a paddock is a familiar sight. One that drains into the ground through a weep hole when you shut it off needs an approved device, a dual check valve for example, on the line that feeds it. Same goes for an old well kept alongside Town water: private wells are on the Town’s hazard table, so tell your tester if one still runs anything.
Town water stops at the corporate limits. The farms and estates around Middleburg draw from their own wells, and a house on its own well usually gets no utility backflow letter at all. A lawn system or a barn line on a well can still pull water back toward the well, so a device there protects your own water rather than the Town’s. For how the rest of the county handles it, see backflow testing in Loudoun County.
By the numbers
From the Census Bureau’s 2020 to 2024 survey, owner-occupied homes unless it says otherwise.
ZIP 20117 as a whole: every Middleburg address, the Town and the farms around it, about a tenth of the land in Fauquier County. The Census place for the Town alone has too few homes for steady figures.
When it’s time
With the Town’s wells falling, the Town Council ordered mandatory water conservation effective July 24, 2026, and outdoor use went down to hand watering early and late. A sprinkler system nobody could run is still tied into Town water, so its May 1 inspection still comes due, and the device still needs draining before a hard freeze.
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.
Choosing a tester
Questions to ask anybody who offers to test it, us included.
Here the owner submits the paperwork, so the visit should end with the Town’s form, or Loudoun Water’s PDF, filled in and signed. Ask for it before the tester leaves, then send it that week.
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.
My technician James gave an honest assessment of my situation, clearly laid out the scope of work, and provided different pricing options to resolve my concern. I will definitely call SwiftPro in the future for any plumbing needs!
Where we work
Next door to Middleburg: Aldie, Purcellville, Leesburg, Ashburn and Haymarket.
Questions
No. Its backflow page links the lists Loudoun Water and the Town of Leesburg keep, and endorses nobody on them. Whoever you hire, the Town’s regulations ask for a licensed plumber certified by Virginia’s Board for Contractors as a Backflow Prevention Device Worker.
No. A softener or whole house filter with nothing else on the list needs only a check valve on its supply line. Once the Town has proof that valve is there, it doesn’t ask for a yearly inspection. Add sprinklers or a pool later and you’re back on the yearly list.
SwiftPro does, all over Middleburg. 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 Middleburg 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.