Open 24/7 for emergencies
A tank flush in The Plains is $99 right now with a whole-home plumbing check. In 2026, FCWSA flushes the town’s water mains on May 27 and November 23.
Get your price in writing
Send this and the office calls or texts you back to set a time.
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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 The Plains
Inside the town limits the water is FCWSA’s The Plains system: two drilled wells, 415 and 610 feet deep, pumping to an above-ground storage tank set higher in the system. The geologic map puts Catoctin greenstone under the town, an old volcanic rock, and water drawn up through rock can carry minerals and fine grit that drop out wherever water sits still and gets heated. The bottom of your tank is that place.
FCWSA’s 2025 report prints no hardness number for The Plains, so there’s no published figure to set a schedule by, only the tank itself. What the report does list is zinc orthophosphate, added at the wells to coat household pipes against corrosion. That protects your copper; it does nothing to keep grit from settling in a tank. Draining it once a year is still how that comes out.
FCWSA’s 2026 flushing schedule lists The Plains for two dates, May 27 and November 23, all areas. On a flushing day the mains get run hard for hours, and pressure can drop, air can spit from the taps and the water can come out tinted. The Authority asks you to hold off on laundry and baths, then run a cold tap until it’s clear. Keep the hot side closed until then, so the heater doesn’t draw in what the mains shed. A yearly flush booked after the November round sends the tank into winter clean.
Most of 20198 lies outside the town, and out there a house usually runs on its own well; the USGS says wells supply every private household in Fauquier County. Some have a sediment filter or a softener ahead of the heater, some have nothing. The well and its equipment belong to a well contractor; the flush starts at the water heater’s cold inlet. About a quarter of the ZIP’s owners heat with propane, and a propane tank’s burner fires right under whatever has settled.
By the numbers
From the Census Bureau’s 2020 to 2024 survey. Median year built and heat count owner-occupied homes only.
ZIP 20198 as a whole, the Town included: its own homes are too few for steady Census figures.
When it’s due
If the little screens on your faucets keep collecting sand-like grit, the same grit is settling in the water heater, usually more of it. That’s common enough on a private well that a yearly flush is worth booking before the tank starts making noise.
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.
The town’s pressure comes from the height of FCWSA’s tank, and FCWSA says a customer above 80 psi should add a pressure regulating valve at their own cost. A gauge on a hose bib takes seconds. Ask for the number, since high pressure is hard on a water heater’s relief valve and every fitting in the house.
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.
James plumbing Tech was Friendly and Professional. Very well communicated. My water heater tank is top-notch and looks awesome. Highly recommend James nickname (Jimbo)and customer service. Thank you guys
Where we work
Next door to The Plains: Broad Run, Haymarket, Rectortown, Marshall and Gainesville.
Questions
No. Flash floods have closed Old Tavern Road half a mile from town, and a cellar that takes water can soak a water heater’s burner or lower element. That’s a check of the gas control or the elements first, on our water heater page, not a flush.
$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 The Plains 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.