Open 24/7 for emergencies
Water heater flushes and tankless descaling in Great Falls, 22066, on Fairfax Water or a private well. 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 Great Falls
How often a Great Falls tank needs flushing depends on where the water comes from. On Fairfax Water, it’s Potomac water treated at the Corbalis plant, which generally serves the north end of the county, and its 2025 readings ran from 4.1 grains per gallon in May to 10.8 in November. That’s hard enough to leave a fresh layer of sediment in a tank every year, so once a year is the schedule we keep.
On a well, nobody publishes a number for you, and close to a quarter of the private wells the Health Department has mapped in Fairfax County are inside the Great Falls Census area. Your water is whatever the rock under your lot gives it. The county asks well owners to test every year and to check their treatment equipment; if your test or your water treatment company gives you a hardness figure, set the flush schedule by that one.
Treatment changes the picture too. A neutralizer, the tank that raises the pH of acidic well water, works by dissolving minerals into the water, and they come back out as sediment in the water heater. A softener cuts the sediment but wears the anode rod down faster. Either way, the anode is worth a look every time the tank is drained.
Big houses here often carry two water heaters, one for the main floors and one for a finished basement. Nine in ten Great Falls houses have a full basement, so the drain hose usually has a floor drain or a sump pit close by. Each tank gets its own flush and its own anode check; tell us about both when you book.
By the numbers
From the Census Bureau’s 2020 to 2024 survey. Median year built and heat count owner-occupied homes only.
When it’s due
On a well with a neutralizer, the screens in the faucets and the washer hoses can fill with gritty flecks that settled out in the tank. A flush clears what’s in the tank. If the flecks are soft white plastic instead, it’s a broken dip tube, and that’s a repair.
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.
It changes the job. On Fairfax Water the hardness is published; on a well it’s whatever your last test said, and a neutralizer can push it up. A tech who asks sets the schedule by your water, not the county’s.
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!!
Questions
On Fairfax Water, the Potomac supply ran 4.1 to 10.8 grains per gallon through 2025, hardest in the fall. On a well, your own test is the answer, and a neutralizer makes it harder. Either way a yearly tank flush stays ahead of it, and a tankless unit on hard water should be descaled yearly too.
Yes, the same way as natural gas: the burner goes to pilot, the cold supply is shut, and the tank drains from the valve at the bottom. About one in twelve Great Falls owner homes heat with propane, and the burner and the flue get a look while the tank is down.
$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 Great Falls 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.