Water heater flush in Great Falls.
Water heater flushes and tankless descaling in Great Falls, 22066, on Fairfax Water or a private well. A tank flush is $99 right now.
- Tank or tankless, any brand
- Priced before we start
- Pay after the visit
Book a flush or a descale
Great Falls flushes go by two waters: Fairfax Water’s or your own well’s.
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.
Great Falls houses, by the numbers
From the Census Bureau’s 2020 to 2024 survey. Median year built and heat count owner-occupied homes only.
What a water heater flush costs in Great Falls.
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.
Why people in Great Falls book a flush.
White flecks in the faucet screens
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.
It pops or rumbles
That’s water boiling under a layer of sediment on the bottom of the tank. A flush clears it out.
Nobody knows when it was last done
Which is most houses. The drain valve at the bottom of the tank has usually never been opened.
How to pick who flushes your water heater in Great Falls.
Questions worth asking anybody you call, us included.
Do they ask whether you’re on a well?
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.
Do they check the anode rod and test the relief valve?
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.
On a tankless, do they pump descaler through it?
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.
What our customers say.
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!!
5.0 stars across 884 Google reviews. Read them on our reviews page.
Water heater flush questions from Great Falls.
How hard is the water in Great Falls?
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.
Can you flush a propane water heater?
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.
How much does a water heater flush cost in Great Falls?
$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.
Water heater flushes in the towns next door.
- Water heater flush in Reston
- Water heater flush in Herndon
- Water heater flush in Sterling
- Water heater flush in Vienna
- Water heater flush in McLean
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Book the flush, tank or tankless.
Call, or book online and pick a window. Tell us tank or tankless, and the tech brings the right gear.
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 884 Google reviews. SwiftPro maintains a dedicated HVAC team and a dedicated plumbing team.
SwiftPro Heating, Cooling & Plumbing, 4230 Lafayette Center Dr, Suite N, Chantilly, VA 20151, (703) 997-9757. Book online, read our reviews, or see every town we serve.