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Sump pump replacement in Dunn Loring: $697 installed in your existing pit. A new pit, a battery backup, outside drain work or new wiring is extra.
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5.0 stars across 1,132 reviews
Two of our technicians in a basement mechanical room, beside the furnace and a gas 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
The same price as our sump pump replacement page: one flat number for a new pump in a pit that’s still sound, with what costs extra named right beside it.
Sump pump replacement, installed in your existing pit
$697
Sump pump and battery backup, installed together
$3,200
or $53/mo at 0% APR for 60 months
A new or deeper pit, discharge line work outside, or a dedicated circuit
Priced in writing before we start
Monthly figures: 60mo @ 0% APR on each starting price, the whole price financed, on approved credit. Longer plans lower the payment and cost more in total. The lender sets the final terms. How financing works
$697 covers a new cast iron pump, a quiet check valve, new PVC up to your existing discharge line, a battery water alarm by the pit, the old pump hauled away and a bucket test before we leave.
A battery backup keeps pumping through a power outage, and the outage usually comes with the storm. With a new pump, the pair is $3,200 installed. The sump pump estimator helps you decide whether you need one.
What’s different in Dunn Loring
Dunn Loring is basement country. Of the 742 houses Fairfax County’s tax records list with a 22027 address, about nine in ten have a full basement, half are daylight basements, and 617 have a finished rec room down there. When a pump quits, the water reaches carpet and drywall well before anybody upstairs hears a thing.
The ZIP sits up on the Piedmont, about 430 feet above sea level at the USGS’s Dunn Loring point, which sounds like dry ground. The soil says otherwise. Fairfax County’s soil map puts about half the land in 22027 on soils whose seasonal high water table can rise to within two feet of the surface: Sumerduck along the drainageways, and Beltsville, with a dense layer two feet down that water pools on. For both, the county’s soils guide calls for foundation drains and waterproofing to keep a basement dry.
The rain comes in bursts. Vienna’s weather station, 3.6 miles west, averages about 43.6 inches of precipitation a year, and on September 30, 2010, a gauge near I-66 at Vienna caught 4.80 inches. On July 8, 2019, the National Weather Service logged a flash flood under the Dunn Loring name. Those are the days a pit fills faster than a tired pump can empty it.
Then the power. Tropical Storm Irene left about 81,000 outages across Fairfax County in 2011. Dunn Loring is unincorporated county, so the Flood Mitigation Assistance Program can return half of what a battery backup cost you; it leaves out the Town of Vienna, the Town of Herndon or the City of Fairfax. Vienna mail is common here, so check the property in the county’s Master Address Repository first, and keep the itemized invoice and a photo of the finished install: the program asks for both.
By the numbers
From the Census Bureau’s 2020 to 2024 survey, owner-occupied homes unless it says otherwise.
ZIP 22027 as a whole: every Dunn Loring address. The Dunn Loring Census place is bigger: about three in four of its homes have Vienna mail.
When it’s time
In a finished basement that’s often how a failed pump shows itself, because the pit is boxed in behind a closet door and nobody hears it stop. A full pit and a silent pump point at the pump, its float or its power.
The county’s Flood Mitigation Assistance Program pays back half of a battery backup, up to its cap, after the work is done and paid for. Not the pump itself, and not homes in the Town of Vienna, the Town of Herndon or the City of Fairfax.
Zoeller, who make a lot of the pumps around here, puts a sump pump’s life at seven to ten years. Past seven, replace it on your schedule instead of the storm’s.
After a heavy rain
Six checks you can make yourself once the rain lets up, none of them with your hands in the pit. Then call us and we’ll check it all.
Watch the pit during the rain or right after. The pump should start as the water rises, empty the pit and shut off. A full pit, or a pump that hums and moves nothing, isn’t keeping up.
Walk the basement: the corners, the walls, the floor by the pit, under the water heater and the furnace. Photograph any wet spot before you mop, so we can see where it came in.
Outside, find where the pump’s pipe ends. It should be open, not crushed, buried or full of leaves, and aimed away from the house so the water doesn’t run back to the foundation.
Listen when the pump shuts off. Water rushing back into the pit means the check valve isn’t closing, and the pump has to move that water again.
The pump stops when the power does, often at the height of the storm. If the basement took water during an outage, that’s the job a battery backup does.
If water is standing near the pit, an outlet or anything plugged in, don’t wade in to check. Call us, and only switch the power off at the panel from somewhere dry.
Not sure what you saw? Call us after a storm and we’ll check it all: the pump, the float, the check valve, the discharge line and where the water came in. If the pump can’t keep up, a new one is $697 installed in your existing pit; a new or deeper pit, a battery backup, discharge line work outside and a dedicated circuit are extra, priced in writing before we start.
Choosing who replaces it
Questions to ask anybody who quotes you, us included.
A pit that fills again within minutes after rain is a different case from one that barely moves. Ask the plumber to time it; on wet soil that number decides whether a battery backup earns its place.
Ask what the number covers: the pump, the check valve, the pipe, hauling the old one off, a test before they leave. Then ask what costs extra, and get it in writing.
Cast iron, ideally. Plastic pumps cost less and are usually the ones that quit early. Ask before the old one comes out.
A discharge line that’s cracked, buried or frozen shut every January leaves the new pump pushing against a closed pipe. Whoever replaces it should check the outside end too.
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.
Tech was super knowledgeable, polite, communicative, and kind. I highly recommend this great company who prioritized my request to review my sump pump and other related needs
Where we work
Next door to Dunn Loring: Vienna, Falls Church, McLean, Annandale and Oakton.
Questions
Look up your address on Fairfax County’s online soil map; every soil on it carries a depth to its seasonal high water table. Sumerduck, Beltsville, Codorus or Hatboro means water close to the surface for part of the year, and a sound pump with a battery backup is worth having.
Somewhere the water keeps moving. Much of 22027 is compacted fill that soaks water in slowly, so a discharge ending a foot from the foundation tends to come back to the pit. Run it to ground that slopes away from the house, on your own lot, and never into a sewer cleanout: Fairfax County’s sewer diagram calls a sump piped into the lateral an improper connection.
$697 installed in your existing pit: a new cast iron pump, a quiet check valve, new PVC to your discharge line, a battery water alarm, the old pump hauled away and a bucket test. A new or deeper pit, discharge line work outside, a battery backup and a dedicated circuit are extra, priced in writing before we start. A new pump and a battery backup installed together are $3,200.
Yes. Pour five gallons of water into the pit. The float should rise, the pump should start within a few seconds, and it should shut off clean once the water’s down. If you hear water rushing back into the pit after it stops, that’s the check valve.
Ready when you are
Call, or send the form at the top. Often same-day, and we will tell you honestly when we can get there.
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 Dunn Loring 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.