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Sump pump replacement in Dumfries: $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 Dumfries
Not every Dumfries home has a sump pump, so start there. About one Town home in ten is a mobile home, set on piers behind skirting with no basement under it, and Grayson Village, from 1971, is the largest park on the Town’s list. A townhouse or a single-family house here may have a basement with a pit, or sit on a slab with none. The Census doesn’t count basements, so check the floor of your lowest level: a lidded basin sunk into a corner is the pit.
Where there is one, the ground decides how hard the pump works. The Town sits on the fall line, part Coastal Plain and part Piedmont, and its comprehensive plan lists shrink-swell clay, slope and seasonal wetness among the troubles with the Coastal Plain soils here. Water held in clay through a wet spring keeps finding the lowest point around a foundation, which is why a pit in that ground can run for weeks after the rain quits.
The lowest ground follows Quantico Creek. The Town’s plan says most developed land sits outside the 100-year floodplain, which runs mainly along the creek and its tributaries, and the floodplain manager in Public Works will check a parcel against FEMA’s map. A sump pump moves groundwater that rises into the pit. It can’t hold back a creek over its banks, so on the lowest lots the flood map matters more than the pump.
Where the water goes counts as well. Prince William Water lists sump pumps, downspouts and foundation drains tied into the sewer as improper connections behind sewer overflows. The discharge belongs outside, carried away from the house, not into a floor drain or a laundry sink. Out in Montclair the single-family houses are mostly from the 1980s and 90s, and in Cherry Hill, built mostly since 2000, a basement pit may still hold the builder’s pump.
Neighborhood by neighborhood
Census figures for the owner-occupied homes in each place, and what to check on a sump pump in houses that age.
| Place | Median home built | Most homes are | Heated with | What to check |
|---|---|---|---|---|
| Montclair | 1989 | single-family houses, about 8 in 10 | electricity, about 5 in 10 | 1980s and 90s basements: an original pump is long overdue. |
| Cherry Hill | 2005 | townhouses, about 4 in 10 | gas, about 7 in 10 | Newer basements: the pump may still be the builder’s. |
| Dumfries | 1985 | townhouses, about 4 in 10 | electricity, about 5 in 10 | 1980s and 90s basements: an original pump is long overdue. |
By the numbers
From the Census Bureau’s 2020 to 2024 survey, owner-occupied homes unless it says otherwise.
Nearly all of the Town sits in 22026, with a sliver in Triangle’s 22172. None of it is in 22025.
Montclair in 22025, where the Postal Service accepts Montclair as the town name; Southbridge and Cherry Hill in 22026, outside the town line.
ZIPs 22025 and 22026 as a whole: Montclair, Cherry Hill and the rest of Dumfries mail, the Town’s homes included.
When it’s time
In Dumfries clay a pit can keep filling long after the rain stops. A pump cycling every few minutes in April is doing its job, and wearing out at the same pace. If yours is getting old and runs like that every spring, replace it before the next wet season.
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.
Water is running back into the pit through a check valve that no longer closes, so the pump moves the same water again and again until it wears out.
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.
In an older Dumfries basement the discharge may have been piped into a floor drain or a laundry sink years ago. Prince William Water counts that as an improper connection, so ask whoever replaces the pump to trace the line and tell you where it ends.
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.
Replaced 2 sump pumps. Very professional, proficient, and courteous.
Where we work
Next door to Dumfries: Triangle, Quantico, Woodbridge, Lorton and Stafford.
Questions
No. Prince William Water says the property owner is responsible for repairing or replacing a sump pump; the utility only helps look into one it installed itself. A new pump in the pit you already have is $697 installed.
Most developed parts of the Town aren’t, according to its plan; the flood zones run mainly along Quantico Creek and its tributaries. For your own parcel, ask the Town’s floodplain manager in Public Works, who looks it up against FEMA’s map.
Hard enough to close roads. NOAA’s storm events database records Quantico Creek flooding over Mine Road in August 2020, Batestown Road closed by high water in January 2024, and on June 26, 2025, flash flooding that shut roads around the Town and brought swiftwater rescues near Possum Point Road and Route 1. Nights like those are when a tired pump falls behind, so run the after-a-storm checks on this page once the rain quits.
$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 Dumfries 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.