Open 24/7 for emergencies
In Falls Church a tank flush is $99 right now and a tankless descale $300 (regularly $350), on the water Fairfax Water buys from the Washington Aqueduct.
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5.0 stars across 1,132 reviews
Two of our technicians in a customer’s basement, next to the furnace and a tank water heater.
Licensed and insuredVirginia Class A contractor #2705192276
24/7 emergency serviceOften same-day, 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
Same prices as our water heater flush page, anywhere in Northern Virginia, and you pay after the visit.
Tank water heater flush, with the plumbing check
$99, normally $199
Tankless descale, with the plumbing check
$300, regularly $350
Comfort+ membership, a water heater flush with a sewer camera inspection every year included
$199 a year
Both visits include a whole-home plumbing check: supply lines, shutoffs, a pressure reading, drains, toilets and traps.
One per household, owner-occupied homes, limited time. A leaking tank, or one that’s 15 years old, needs repair or replacement, not a flush.
More for the money: Comfort+ membership, $199 a year, includes the flush and its plumbing check every year, plus a sewer camera inspection, a dryer vent cleaning and heating and cooling maintenance visits.
What’s different in Falls Church
On January 3, 2014, Fairfax Water bought the City of Falls Church’s water system and took over the City’s contract with the Washington Aqueduct along with it: up to 31 million gallons a day from the Army Corps of Engineers’ two Potomac plants. Its 2026 water quality report still maps most of Falls Church, the City and the county streets around it, as the area that typically drinks Potomac water from the Aqueduct’s Dalecarlia and McMillan plants.
The Aqueduct’s own 2025 lab report puts that water at 96 to 187 milligrams per liter, 5.6 to 10.9 grains per gallon, and it moves with the river: the two plants tested softest in May and June and hardest in December. A tank lives with all twelve months of it, so we plan for December, not May. Fairfax Water’s own two plants supply Bailey’s Crossroads instead, at 3.0 to 10.8.
Where the heater sits decides where the flush drains. In West Falls Church and Lake Barcroft, mostly single-family houses from the late 1950s, the heater stands on the basement floor with a drain somewhere close, long since swapped for a newer one. In the City’s newer buildings and the condos of Seven Corners and Bailey’s Crossroads it’s a closet heater, and the drain water goes to the laundry sink or a bucket, carried out a few gallons at a time.
Maintenance-plan visits are a bigger part of our Falls Church work than anywhere else we work regularly. The flush is one of those visits: Comfort+ includes a water heater flush with a sewer camera inspection every year, along with a heating and a cooling maintenance visit.
Neighborhood by neighborhood
Census figures for each place, and what we’d look at first on a flush there. Median year built and heat count owner-occupied homes only.
| Place | Median home built | Most homes are | Heated with | What we’d look at first |
|---|---|---|---|---|
| West Falls Church | 1957 | single-family houses, about 6 in 10 | gas, about 7 in 10 | Older houses on their second or third heater: we read the label first. |
| Bailey’s Crossroads | 1980 | condo and apartment buildings, about 6 in 10 | electricity, about 5 in 10 | Closet heaters over a pan: we flush to a bucket or the laundry drain. |
| Idylwood | 1975 | condo and apartment buildings, about 4 in 10 | gas, about 5 in 10 | Closet heaters over a pan: we flush to a bucket or the laundry drain. |
| City of Falls Church | 1964 | condo and apartment buildings, about 5 in 10 | gas, about 7 in 10 | Closet heaters over a pan: we flush to a bucket or the laundry drain. |
| Lake Barcroft | 1958 | single-family houses, about 6 in 10 | gas, about 8 in 10 | Older houses on their second or third heater: we read the label first. |
| Seven Corners | 1972 | condo and apartment buildings, about 5 in 10 | gas, about 6 in 10 | Closet heaters over a pan: we flush to a bucket or the laundry drain. |
| Pimmit Hills | 1961 | single-family houses, about 7 in 10 | gas, about 9 in 10 | Older houses on their second or third heater: we read the label first. |
By the numbers
From the Census Bureau’s 2020 to 2024 survey. Median year built and heat count owner-occupied homes only.
ZIP 22046, plus a few City addresses in 22042 and 22044.
22041 to 22044: West Falls Church, Idylwood, Lake Barcroft, Seven Corners and Bailey’s Crossroads.
When it’s due
The Aqueduct’s plants tested hardest from October through December in 2025. A tank last flushed in May has been settling out the year’s hardest water ever since, and the start of the heating season is a natural time to drain it.
We flush it into a bucket or the laundry drain, not across the floor, and check the pan under it while we’re there.
That’s water boiling under a layer of sediment on the bottom of the tank. A flush clears it out.
Choosing who does it
Questions worth asking anybody you call, us included.
Falls Church water didn’t drop below 5.6 grains per gallon at the Aqueduct’s plants in any month of 2025. Someone who reads that number puts a tankless here on a yearly descale, not a someday one.
The anode is the part that corrodes so the tank doesn’t, and the relief valve is the tank’s safety valve. A flush that skips both is just draining water.
A real descale isolates the heater at its service valves and pumps solution through the heat exchanger, then rinses it and cleans the inlet screen.
Two of our crew going over a work order before the day's calls.
From our Google reviews
5.0 stars across 1,132 reviews. Read them on our reviews page.
I had a really pleasant personal experience with Swiftpro when my water heater went out. The pricing was very reasonable compared to the many other HVAC companies I sought quotes from. I highly recommend them
Where we work
Next door to Falls Church: Dunn Loring, Arlington, Annandale, McLean and Vienna.
Questions
Yes. Most of Falls Church typically gets Aqueduct water, 5.6 to 10.9 grains per gallon over 2025, and the Bailey’s Crossroads side gets Fairfax Water’s own at 3.0 to 10.8. That’s moderately hard to hard: flush a tank every year, and descale a tankless on the schedule its maker sets.
The company changed in January 2014. The source mostly didn’t: Fairfax Water kept the City’s Aqueduct contract, so most of Falls Church still drinks Potomac water treated at Dalecarlia and McMillan, the same Aqueduct that Arlington buys from.
$99 right now for a tank, normally $199, with a whole-home plumbing check. A tankless descale is $300 right now, regularly $350. Comfort+ membership, $199 a year, includes the flush every year.
Ready when you are
Call, or send the form at the top. Tell us tank or tankless, and the tech brings the right gear.
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 Falls Church and the rest of Northern Virginia. Virginia contractor license #2705192276. 5.0 stars across 1,132 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.