The short answer
If sewage or dirty water is coming up a floor drain, a basement shower or a basement toilet in a Northern Virginia house, the main sewer line is blocked, and everything anyone runs upstairs is coming out down there. Stop using water. All of it: no flushing, no washer, no dishwasher, no showers, until the line is cleared. That one step decides whether you have a puddle or a flooded basement.
The first hour
- Tell everyone in the house to stop using water. If the washer or dishwasher is running, stop it.
- Stay out of standing water near outlets, the furnace, the water heater or anything plugged in. If you can reach the electrical panel without standing in water, shut off the basement circuits. If you can’t, leave it.
- Don’t pour drain cleaner in. It won’t get through a main line blockage, and it ends up in the water you and the plumber are standing in.
- Don’t open the sewer cleanout yourself. With the line backed up, the cleanout is holding back a column of sewage, and the cap can come off under pressure (what a sewer cleanout is).
- Take photos and video of the water, the drain it came from and everything it touched, before anything gets moved. Your insurer will ask for them.
- Check with a neighbor. If houses on your street are backing up too, it may be the public sewer, and your county or town’s sewer emergency line is the call.
- Wear rubber boots and gloves for anything you touch, and keep kids and pets upstairs.
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Why it comes up in the basement
Water finds the lowest opening. When the line is blocked between the house and the street, the water from every sink, tub and toilet backs up the pipe until it reaches the lowest drain, and in a house with a basement that’s the floor drain or the basement bathroom. What blocks it is usually one of these:
- Tree roots. They find the joints in older clay and cast iron lines and grow inside. Plenty of Northern Virginia houses have big trees over the line.
- Wipes, paper towels and grease, building up over months until a heavy day closes the gap.
- A sag in the line, called a belly, where waste settles instead of flowing.
- Orangeburg, a tar-paper pipe used in some houses built through the 1950s and 1960s that flattens under the soil (Orangeburg pipe).
- A storm. When heavy rain overloads the public sewer, it can push back up the line into the house.
The warning signs before a backup
Most main lines give notice. The toilets gurgle when the washer drains. The drains on the lowest floor get slow, or several drains get slow at once. A little water shows up in the basement floor drain or shower after a load of laundry. The toilet water rises and then falls slowly after a flush. The basement smells like sewer some days and not others (sewer smell in the house). Any one of those is the time to call, and it costs a lot less than the cleanup (when a slow drain is worth fixing).
What it costs
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| The job | Northern Virginia | What decides it |
|---|---|---|
| Main sewer line cleared | $550 to $1,650 | How far down the blockage sits. The middle is about $1,100. |
| Camera inspection, added to the visit | $89 | You watch the screen with the plumber. Roots, cracks and sags show up plain as day. |
| Camera inspection on its own | $500 to $1,700 | The line usually has to be cleared before the camera can see anything. |
| Line replaced, dug up | $7,500 to $9,000 | Rock and clay are why digging here costs what it does. |
Most backups end at the first row. If roots or grease come right back, jetting scours the inside of the pipe instead of punching a hole through the clog (hydro jetting). If the camera shows the pipe itself is broken, you see it on the screen before anyone talks about digging. Replacing it dug up runs $7,500 to $9,000. From about $125 a month at 0% APR for 60 months, the whole price financed, on approved credit. Some lines can be lined in place instead (trenchless sewer repair), and the full breakdown is in sewer line replacement cost.
Already have a quote to dig up your line? Our free second opinion looks at it. You don’t owe us anything for looking.
What insurance pays in Virginia
A backup damages two things, the pipe and the basement, and insurance treats them separately.
The basement. Virginia Code 38.2-2120 requires insurers to offer coverage for water that backs up through sewers or drains, and the State Corporation Commission’s consumer guide tells homeowners to get it. It’s an add-on, not part of the base policy, so you have to have said yes before the backup. If you don’t know whether you have it, call your agent this week.
The pipe. The standard homeowners form most policies here are built from excludes wear and tear, deterioration, rust and corrosion, and settling, which is how most sewer lines fail. So a base policy generally won’t pay to replace the line. Service line coverage is a separate add-on that does cover those causes, tree roots included. One catch in the fine print: a clog with no damage to the pipe isn’t a claim, so clearing a grease or wipes blockage is on you.
We don’t file or negotiate insurance claims. We hand you the camera footage and photos of what we found, which is what an adjuster asks for.
Keeping it from happening again
A backwater valve is a one-way flap on the main line that lets water out and closes when the sewer pushes back. In a finished basement it’s the one upgrade that earns its keep, and the City of Alexandria has a program that pays back part of the install for city homeowners, so check its current terms before you book. Past that: wipes, grease and paper towels go in the trash, a camera every few years is cheap insurance on an older line with big trees over it, and a line that roots keep coming back to can be cleared on a schedule instead of in an emergency.
Getting it cleared
SwiftPro’s plumbers clear main lines across Northern Virginia, day and night. The drain machine and the camera are on the truck, and you get the price before anyone starts. There’s $50 off any plumbing repair over $400, and the whole-house plumbing inspection is included with any repair, a $149 value (every current deal).
Book it
Backing up right now? Don’t wait for a form. Main line cleaning and sewer work. Call (703) 997-9757, or book online from goswiftpro.com/cookiesoffer and a box of warm cookies comes with the visit. Our plumbers work in Springfield, Vienna, McLean, Burke and across Northern Virginia, 24 hours a day. Rated 5.0 stars across 1,138 reviews on Google, Angi, Yelp, the BBB and Facebook, Virginia Class A license 2705192276.
Questions people ask
What should I do first if sewage backs up into my basement?
Stop using all water in the house, stay away from standing water near anything electrical, and take photos before you clean. Then call a plumber to clear the main line. Don’t pour drain cleaner in, and don’t open the sewer cleanout yourself.
Why is water coming up through my basement floor drain?
The floor drain is usually the lowest opening on the main sewer line, so when the line is blocked between the house and the street, water from upstairs comes out there first.
Does homeowners insurance cover a sewer backup in Virginia?
Not the base policy, usually. Virginia requires insurers to offer sewer and drain backup coverage, but it’s an add-on you have to choose. A separate service line add-on can cover the pipe itself. A clog with no damage to the pipe isn’t covered.
How much does it cost to clear a main sewer line?
In Northern Virginia, $550 to $1,650 at SwiftPro, mostly depending on how far down the blockage sits. Running a camera while we’re there is $89 more.
Can heavy rain cause a sewer backup?
Yes. When a storm overloads the public sewer, it can push back up into houses through the lowest drain. A backwater valve on your main line closes when that happens.
