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Sump pump replacement in Great Falls: $697 installed in your existing pit. A new pit, a battery backup, outside drain work or new wiring is extra.
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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 Great Falls
Fairfax County’s assessment records show a full basement under 93 of every 100 houses in 22066, and about seven in ten list at least one basement bedroom or den. So the pit in a Great Falls basement is often a wall away from where somebody sleeps. Two in three are recorded as daylight basements, with one side opening onto the yard at ground level.
Groundwater does most of the pumping. The county’s soil and water conservation district says groundwater tables in Virginia run highest in February and March, with snowmelt and spring rain, so late winter is usually when a tired pump gets its hardest work. Half the houses here went up in the 1970s and 80s, and a pit from then has likely been through a few pumps already.
About 4,100 of the 6,120 home addresses in 22066 are on septic, and the county’s septic code says two things about the basement pit. Its discharge may not connect to the septic system and has to be kept clear of the drainfield. And sewage may never be piped into a sump that gathers floor drains and storm water, so what leaves a toilet, a sink or the washer stays out of the pit.
On the sewered side, Holly Knoll, Locust Hill and Great Falls West among them, the county’s wastewater office calls an unpermitted sump connection to the sanitary sewer illegal and says to have a plumber correct it. Where the water should go instead, the district answers: a storm sewer where one is nearby, otherwise a swale, a ditch or a stream that carries it off without causing problems for a neighbor.
By the numbers
From the Census Bureau’s 2020 to 2024 survey, owner-occupied homes unless it says otherwise.
When it’s time
If the pump cycles fine but water seeps in where the floor meets the wall, the district points at the drain under the slab: plugged, or laid without enough fall to the pit. A new pump won’t fix that, and we’ll tell you so before anyone sells you one.
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.
Over the decades a basement bar sink or a laundry tub sometimes gets piped into the sump. That’s wastewater, and on a septic lot the county’s code bars it from a sump outright. Ask the plumber to check what flows in before the pump gets quoted.
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
Questions
Yes. Every home address in 22066 is under Fairfax County itself, so the Flood Mitigation Assistance Program applies; it’s closed only to the Town of Vienna, the Town of Herndon or the City of Fairfax. Keep the itemized invoice and take photos of the finished backup, since the program asks for both, and any permit or association approval is the applicant’s to show.
Have one put in. A pit in the floor usually means a drain under the slab feeds it, and the soil and water district’s advice for a full sump with no pump is a licensed plumber and a new pump. In a sound pit that’s $697 installed.
They can, especially on the daylight side. On July 19, 2025, slow thunderstorms sent one to two feet of water over Georgetown Pike near Miller Avenue and over River Bend Road, by the National Weather Service’s storm reports, and in the summer of 2018 Beach Mill Road closed twice for high water, once when Jefferson Branch left its banks. On a sloping lot that same runoff heads for the open, at-grade wall of a daylight basement, so walk that side once the rain stops, then look at the pit.
$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 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.