The fifth year came around
If your City device went in, or was last rebuilt, five years ago, this year’s visit is the overhaul plus the test. Book them together and it’s one trip.
Manassas, Virginia
Backflow testing in Manassas.
Backflow testing in Manassas, City or county side. Which side of the line you’re on decides who files the report and what’s due every fifth year.
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- One flat price per device
- Repairs priced in writing first
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What it costs
What a backflow test costs in Manassas.
How many devices you have and what kind they are decide the number, so there isn’t one figure that fits every house. You get one flat price per device when you book, before anyone comes out.
Yearly backflow test
One flat price per device, given when you book
Repair or rebuild after a failed test
Priced in writing before any work
New backflow preventer, installed
Priced in writing before any work
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.
The national numbers, and what moves a price up or down, are in our backflow testing cost guide.
What’s different in Manassas
Two backflow programs meet at the Manassas City line.
A Manassas address can land under either of two backflow programs. Inside the City, which runs its own water system, it’s the City’s Water and Sewer Division. Past the line, in Sudley, Bull Run, Yorkshire, Buckhall and Independent Hill, it’s Prince William Water and county code. Your ZIP won’t settle it, since 20110 also takes in county edges of Buckhall and Loch Lomond. The water bill will: whoever sends it, those are your rules.
Inside the City, the paperwork travels the other way. The City’s instructions to testers call for one complete City report form per device, with the City’s copies sent to its Cross-Connection Control Coordinator; your copy stays at the house for at least five years. The tester needs more than the state certificate, too: a City backflow worker card, whose number goes on the form.
The fifth year is the one that catches people. That year a City PVB, RPZ or double check gets rebuilt with new rubber, then tested; a new device instead is your choice. About half the City’s homes went up in the 1980s and 90s, so sprinklers there were often added by an owner later, and the upkeep history may not have come with the house. And a new RPZ or double check can’t go in a pit or valve box: outside, it sits above ground in a heated enclosure unless it comes off for winter.
On the county side, the houses change by neighborhood. Independent Hill is almost all detached and about half built since 2000, so the sprinklers and their PVB often came from the builder. In Loch Lomond nearly nine homes in ten were built before 1980, so a device there usually means an owner added sprinklers. Sudley is close to half townhouses, where the association more often runs the watering. Prince William Water’s own form allows 30 days past the due date for the results to arrive, by mail or at crossconnections@pwwater.org. The Prince William County page sets the county’s rules beside the City’s.
Neighborhood by neighborhood
Where the backflow devices are across Manassas.
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 |
|---|---|---|---|---|
| City of Manassas | 1985 | single-family houses, about 4 in 10 | electricity, about 5 in 10 | Sprinklers added by an owner, pools and hot tubs. |
| Buckhall | 1995 | single-family houses, about 8 in 10 | electricity, about 5 in 10 | Sprinklers added by an owner, pools and hot tubs. |
| Sudley | 1977 | townhouses, about 4 in 10 | gas, about 6 in 10 | Mostly the association’s sprinklers, plus any yard system an owner added. |
| Independent Hill | 2000 | single-family houses, nearly all | gas, about 6 in 10 | Lawn sprinklers the builder put in, and their device. |
| Bull Run | 1995 | condo and apartment buildings, about 5 in 10 | gas, about 7 in 10 | The building’s fire line, tested by the association. |
| Yorkshire | 1984 | single-family houses, about 4 in 10 | gas, about 5 in 10 | Sprinklers added by an owner, pools and hot tubs. |
| Loch Lomond | 1968 | single-family houses, nearly all | gas, about 7 in 10 | A sprinkler system or pool added later, where there is one. |
By the numbers
Manassas houses, by the numbers
From the Census Bureau’s 2020 to 2024 survey, owner-occupied homes unless it says otherwise.
The City of Manassas
The whole City sits in ZIP 20110. It runs its own water, sewer and electric service.
The Prince William County side
Sudley and Bull Run in 20109, Yorkshire and most of Buckhall in 20111, Independent Hill in 20112, plus the county edges of 20110.
When it’s time
When a backflow preventer in Manassas needs a tester.
The yearly notice came
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.
Water running from the relief valve
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.
Before the first hard freeze
Before it freezes in Manassas, drain the backflow preventer.
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.
- 1
Find the device
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.
- 2
Shut the sprinkler supply
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.
- 3
Get the water out
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.
- 4
Leave the valves halfway
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.
- 5
Cover it, but not the relief port
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.
- 6
Taking it off? Ask first
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
Who sends the backflow test notice in Manassas.
City of Manassas
The City’s design standards have a backflow device tested when it’s installed, after any repair or replacement, and every year after that, and RPZs, double checks and PVBs get new rubber parts every five years. Source.
Prince William County
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
How to pick who tests your backflow preventer in Manassas.
Questions to ask anybody who offers to test it, us included.
Do they carry a City of Manassas backflow worker card?
Inside the City, ask when you book: the card shows the tester is registered there. A report the City won’t accept means another test, at your expense.
Will the test count with your utility?
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.
Who sends the report?
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.
What happens if it fails?
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.
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What our customers say.
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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
Backflow testing in every Northern Virginia town we serve
Next door to Manassas: Bristow, Centreville, Gainesville, Chantilly and Woodbridge.
Fairfax County
Arlington County
Loudoun County
Prince William County
Fauquier County
Stafford County
Questions
Backflow questions from Manassas.
Is my Manassas house in the City or the county for backflow?
Check who sends your water bill. The City of Manassas means the City’s form, its tester card and the five-year overhaul. Prince William Water means the county’s rules, and the owner answers for the passing results reaching the utility.
Does a backflow test in the City of Manassas need a permit?
No. A test, a repair and the five-year overhaul need none. A new or replacement device takes a plumbing permit from the City’s Inspections office and gets a new numbered City tag, and new lawn sprinklers need the City to approve the backflow device’s plans first.
How much does a backflow test cost in Manassas?
One flat price per device, given when you book, before anyone comes out. How many devices you have, and whether one needs a repair, is what moves it. Our cost guide has the national numbers.
How long does a backflow test take?
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
Get the notice off the fridge.
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.
SwiftPro Heating, Cooling & Plumbing
4230 Lafayette Center Dr N, Chantilly, VA 20151
44679 Endicott Dr, Suite 211, Ashburn, VA 20147
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 Manassas and the rest of Northern Virginia. Virginia contractor license #2705192276. 5.0 stars across 1,131 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.