Open 24/7 for emergencies
Water heater flushes and tankless descaling in Lorton, on Occoquan water from Fairfax Water’s Griffith plant. A tank flush is $99 right now.
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Rather talk now? (703) 997-9757
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 Lorton
By Fairfax Water’s own account, southern parts of the county are generally served by its Griffith plant, and Griffith sits right here in Lorton, drawing from the Occoquan Reservoir. It replaced the old Lorton treatment plant, which shut down in 2006. So the water filling a tank in Laurel Hill or Gunston mostly began as Occoquan water, not the Potomac water the north end of the county gets.
Griffith’s lab tested its finished water through 2025, and the hardness ran from 51 to 137 milligrams per liter, about 3 to 8 grains per gallon. It moved with the reservoir: 51 in July and August, 135 in November, 137 in January. That’s a little softer than the Potomac water up north, which peaked at 185, and still plenty to lay a crust of scale on the bottom of a tank for every year it goes undrained.
What sits under that scale depends on the street. In Laurel Hill, where better than eight in ten owners heat with gas, it’s usually a gas burner, and a gas tank with a thick layer crackles and pops as the water boils up through it. In Newington, where close to six in ten heat with electricity, it’s usually an electric tank, and the sediment piles up around the lower element until the element gives out. The flush clears the bottom either way.
The Lorton Census place in the middle of town has more than a third of its homes rented and a quarter of all its homes in condo and apartment buildings. If you own one of those units, the stretch between leases is the easy time for a flush, with nobody waiting on a shower, and the label on the tank tells you whether the money belongs in a flush or a replacement.
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 |
|---|---|---|---|---|
| Lorton | 2001 | single-family houses, about 4 in 10 | gas, about 7 in 10 | A yearly flush, and a look at the anode rod. |
| Newington | 1981 | townhouses, about 6 in 10 | electricity, about 6 in 10 | Townhouses: utility rooms and closets, so we check the pan and the valves. |
| Laurel Hill | 2002 | single-family houses, about 4 in 10 | gas, about 8 in 10 | Newer houses: original tanks reaching the age for an anode check. |
| Mason Neck | 1973 | single-family houses, nearly all | electricity, about 6 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 22079 as a whole: every Lorton address. Most of Newington, in the table, has Springfield mail.
When it’s due
On an electric tank, the kind most Newington townhouses have, that’s often the lower element buried in sediment or already burnt out. Draining the tank clears what’s piled around it, and the tech tests the element while the tank is empty.
That’s water boiling under a layer of sediment on the bottom of the tank. A flush clears it out.
Which is most houses. The drain valve at the bottom of the tank has usually never been opened.
Choosing who does it
Questions worth asking anybody you call, us included.
On an original tank that’s never been drained, opening the valve can be what starts a leak. A good tech reads the label and looks at the bottom of the tank first, and tells you plainly if the money belongs toward a replacement instead.
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.
This Company installed a tankless water system!!! They were great!!! Very Professional & Efficient & they Cleaned up & took out the old water tank! I would highly recommend them!!
Where we work
Next door to Lorton: Fort Belvoir, Springfield, Woodbridge, Fairfax Station and Burke.
Questions
Moderately hard. Fairfax Water’s Griffith plant, which serves the south end of the county, measured 51 to 137 milligrams per liter in 2025, about 3 to 8 grains per gallon. Once a year suits water like that, tank or tankless; a softener ahead of a tankless stretches the time between descales.
Usually not. A tank that old has outlasted most of its kind, and the flush money does more toward the replacement. If yours is newer, say from a swap in the last ten years, a flush at $99 is the cheap way to get more years out of it.
Yes. The hose runs to the washer’s standpipe or a floor drain, and where neither is close we carry the water out a bucket at a time. A closet tank sits over a pan, and the pan gets a look too.
$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 Lorton 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.