The short answer
A lot of older Northern Virginia houses have a clay sewer line running from the foundation out to the street: reddish brown pipe laid in short sections, one joint after another. The clay itself holds up for a very long time. The joints are what fail. Roots get in, sections settle out of line, and a cracked piece breaks down. A camera shows which of those you have, and that decides between cleaning it, fixing one spot, lining it or replacing it.
Why so many houses have it
Clay was the standard sewer pipe for most of the last century, and plenty of houses from before PVC took over in the 1970s and 80s still have it out under the yard. Older neighborhoods in Arlington, Alexandria, Falls Church, McLean and Fairfax County are full of houses from those years. Some from the same years got Orangeburg fiber pipe instead, which is a worse problem. What pipes does my house have walks through the eras.
You usually can’t see it. Inside the house the main drain is cast iron or PVC, and the switch to clay often happens just outside the foundation wall. The age of the house is your first clue. A camera is the sure one.
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What actually goes wrong
Glazed clay doesn’t rust or rot, and what’s in a sewer line doesn’t eat it the way it eats old metal pipe. The trouble is that it was laid in short sections, and every joint between them is a seam.
- Roots at the joints. The most common one by far. Roots find the seam, grow in and catch paper. Tree roots in your sewer line covers it.
- Offset joints. The ground settles and one section drops a little. The lip it leaves catches paper and slows the line.
- A belly. A stretch of line sags and holds water. Belly in a sewer line.
- Cracks. Clay is hard but brittle. Settling, roots and heavy equipment over the line can crack it.
- A collapsed section. The end of the road for that piece of pipe. The line backs up and stays backed up.
A clay line that’s never been disturbed can outlast the house. The ones that fail are the ones with big trees nearby, ground that moved, or joints that were never tight to begin with.
The signs
- Drains that slow down again a few weeks after they’re cleared.
- A toilet that gurgles when the washer drains. Why a toilet gurgles.
- The basement floor drain backing up first. Floor drain backing up.
- A greener, softer strip of lawn over the line, or a low spot along its path.
Camera first
On a clay line, the camera goes in before anybody guesses. It’s $89 added to a visit, it goes in through the cleanout, and you see the footage: the joints, the roots, any crack or sag, and how far from the house each one is. When a sewer camera inspection is worth it explains what you’re looking at.
Clearing a clay line
A drain machine with a cutting head cuts roots back to the pipe wall and opens the line the same day. Hydro jetting is used on clay all the time, at a pressure matched to the pipe, and it washes out the root fibers the cutter leaves. On a section the camera shows is cracked or broken, the plan changes, which is one more reason the camera goes first. Clearing the main line runs $550 to $1,650. Hydro jetting vs snaking explains the difference.
Fix it, line it or replace it
Swipe to see all columns →
Swipe to see all columns →
| What the camera finds | The usual fix |
|---|---|
| Roots at a joint or two, pipe still round | Cut and jet, then clean it on a schedule |
| One cracked or dropped section | Dig one hole and replace that piece with PVC |
| Roots or cracks at many joints, pipe still holding its shape | Line it: a new pipe cured inside the old one, no trench |
| Collapsed, badly sagged or broken in several places | A new PVC line, dug or pulled through trenchless |
Trenchless sewer repair explains lining and pipe bursting, and what a new sewer line costs in Northern Virginia has the prices with the monthly payments next to them.
Buying a house with a clay line
Get the line scoped before you close. A clay line with a couple of root joints is a maintenance item. A collapsed section is a repair you’d rather know about while you can still negotiate. Buying an older house: what to check has the rest of the list, and error codes and warning lights at home covers the signs to watch for once you live there.
When you’d rather we do it
A sink clogged at the trap is $99 with our sink clearing offer, up to the P-trap. A toilet, tub, shower or any drain past the trap is drain cleaning, $200 to $800. The main line to the street runs $550 to $1,650, and when grease or roots keep coming back, hydro jetting clears the pipe wall. You get the price before we start. A plumbing diagnosis visit is $49, or $250 after hours.
Call (703) 997-9757, day or night, or see every current deal on our offers page. Rated 5.0 stars across 1,138 reviews on Google, Angi, Yelp, the BBB and Facebook, Virginia Class A license 2705192276.
Questions people ask
How long does clay sewer pipe last?
The clay itself can last longer than the house. What fails are the joints, from roots, settling and cracks, and how fast depends on the trees and the ground around it.
How do I know if I have a clay sewer line?
Older houses often do, especially ones built before PVC became common in the 1970s and 80s. A sewer camera through the cleanout shows the pipe for sure.
Can you hydro jet a clay sewer pipe?
Yes, at a pressure matched to the pipe. A camera goes in first so a cracked or broken section gets a different plan.
Should I replace my clay sewer line?
Not just because it’s clay. If the camera shows a few root joints on round pipe, cleaning on a schedule is fine. Lots of bad joints, cracks or a collapse are when lining or replacing makes sense.
Can a clay sewer pipe be lined?
Usually, if it still holds its shape. The liner seals every joint so roots can’t get back in. A collapsed or badly sagged section needs replacing instead.
