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The SwiftPro plumbing team in front of three wrapped SwiftPro vans in Northern Virginia, with their RIDGID FlexShaft drain machine, SeeSnake sewer camera and KJ-3100 water jetter
Marshall, Virginia

Backflow testing in Marshall.

SwiftPro tests and repairs backflow preventers in Marshall, 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 Marshall are rated 5.0 stars across 1,130 reviews and work under Virginia Class A contractor license 2705192276. Backflow testing in Marshall, from Main Street to Salem Avenue: we test the device, fix it if it fails and send FCWSA the report. 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.

  • Yearly test $250, normally $300
  • Repairs priced in writing first
  • Dedicated plumbing team

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

What a backflow test costs in Marshall.

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 Marshall

In Marshall, whether a test is due starts with where your water comes from.

Marshall village has been on public water since 2008, when FCWSA bought the town’s private water system and its 584 customers, laid a new main down Main Street and put up towers on Stephenson Hill and out at the Route 17 and I-66 site. Homes inside the Marshall Service District are FCWSA accounts, and their devices fall under its cross-connection program. Past the district line it’s private wells and septic, and FCWSA doesn’t regulate private wells, so out there no utility test notice is coming.

That line isn’t fixed for every house. When a home switches from its own well to FCWSA water, the authority’s plan wants the old well properly abandoned under Health Department rules, with the VDH Well Inspection Statement turned in, and a property that keeps another water source gets an on-site inspection before it’s connected. If you’re making that switch, plan for the backflow device as part of the job instead of hearing about it at the inspection.

Nearly three homes in ten around Marshall are rented. FCWSA sends a fresh self-survey whenever the name on the account changes. It asks about outside spigots, lawn sprinklers, hot tubs, ponds with pumps, water storage tanks and more, so it’s how FCWSA learns what’s on the property. If you just moved in, ask the seller or the last tenant whether the sprinklers were ever tested, and answer the survey from what’s actually in the yard.

More than one owner home in five around Marshall was built before 1960, long before the village had a public water system. Sprinklers on lots like that went in later, on whatever pipe was handy, and the device can end up in a basement corner or crawlspace rather than out by the foundation. North of Main, the newer houses went up from the 1960s through the 1990s, and the townhouse groups south of Main usually water a shared lawn. Our backflow test cost guide covers what drives the price.

The new brass RPZ backflow preventer SwiftPro installed in the same Loudoun County basement, with green shutoff handles and an air gap drain

By the numbers

Marshall houses, by the numbers

From the Census Bureau’s 2020 to 2024 survey, owner-occupied homes unless it says otherwise.

Marshall

ZIP 20115 as a whole: every Marshall address, the village included. The Census place for the village alone has too few homes for steady figures.

  • Median home built1986 Census
  • Built before 1980about 4 in 10 Census
  • Built since 2000about 2 in 10 Census
  • Most homes aresingle-family houses, about 8 in 10 Census
  • Heated withelectricity, about 6 in 10 Census
  • Rentedabout 3 in 10 Census
  • Detached houses with yards are where lawn sprinklers, pools and their backflow devices usually are.

When it’s time

When a backflow preventer in Marshall needs a tester.

A repair or a move means a new test

State rules require a test right after a device is repaired or moved, not just once a year. If your device in Marshall gets fixed or relocated, the test belongs on that same visit, with the results going to FCWSA.

A pool, a hot tub or a big yard

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.

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.

Need backflow testing in Marshall?

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Before the first hard freeze

Before it freezes in Marshall, 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. 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. 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. 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. 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. 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. 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 Marshall.

Fauquier County

The Fauquier County Water and Sanitation Authority says state code (12VAC5-590-580) requires it to make sure every backflow device on its system is installed, maintained and tested every year. It surveys residential customers too, with a residential water system questionnaire (Form CCCP-0003). Source.

A SwiftPro technician beside a wrapped SwiftPro van with Virginia Class A contractor license 2705192276 on its side, in a Northern Virginia neighborhood

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 Marshall.

Questions to ask anybody who offers to test it, us included.

  1. Can they tell you whether you’re even on FCWSA water?

    Around Marshall that’s the first question. A tester who knows the area should check whether your address is an FCWSA account before booking. On a private well with no FCWSA service, there’s no utility report to file.

  2. 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.

  3. 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.

  4. 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 SwiftPro technicians going over a work order on a tablet in front of the van fleet in Northern Virginia

Two of our crew going over a work order before the day's calls.

From our Google reviews

What our customers say.

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.

Kevin Raney, Google review, July 2025
The SwiftPro crew in front of three wrapped SwiftPro vans in Northern Virginia, with their drain machine, sewer camera and water jetter
Some of the SwiftPro crew: the people behind these reviews.

Questions

Backflow questions from Marshall.

Do homes outside the Marshall Service District need backflow testing?

Not under FCWSA’s program. FCWSA doesn’t regulate private wells, so a home on its own well and septic outside the district doesn’t get a utility test notice.

What changes if I switch my Marshall home from a well to FCWSA water?

The old well has to be properly abandoned under Health Department rules and the VDH Well Inspection Statement turned in. If the property keeps another water source, FCWSA inspects it on site before connecting.

Who does backflow testing in Marshall?

SwiftPro does, all over Marshall. 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.

How much does a backflow test cost in Marshall?

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.

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. 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 Marshall 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.

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