When most people think about a home inspection, they picture the roof, the foundation, or maybe the electrical system. What they do not think about is the sewer line. The sewer line is underground and out of sight, but when it fails it can become one of the most expensive repairs a homeowner will face.
As a NJ home inspector, I come across homes with sewer line issues more often than you might expect. These problems usually stay hidden until there is a backup or a collapse. By then, it is too late. A sewer camera inspection before you buy can give you an honest look at the condition of the line.
What a sewer line does
The sewer line carries wastewater from sinks, tubs, showers, toilets, and appliances out of the house to either the town sewer main or a septic system. In many older New Jersey homes the line is buried deep underground and made of materials that do not hold up well over time. Because the line is hidden, it cannot be inspected during a standard NJ home inspection. A camera inspection is the only way to see what is really happening.
Why sewer line problems are common in New Jersey
A lot of homes in this state were built long before modern PVC pipe. Older materials like clay, cast iron, and Orangeburg pipe were commonly used. Clay is brittle and cracks, cast iron corrodes and flakes apart, and Orangeburg collapses. None of these were designed to last forever, and many are now well past their expected lifespan.
Tree roots are another big problem. Roots naturally grow toward moisture and can find their way into cracks or joints in the pipe. Once inside, they spread until they clog the line.
Settlement and ground movement also cause problems. A pipe can sag, creating a belly in the line where water and waste collect. Over time this leads to blockages. Even PVC lines can fail if they were not installed correctly.
Warning signs of a problem
There are a few signs that a sewer line may not be working as it should. Slow or gurgling toilets, water backing up into tubs or drains, and persistent sewer odors inside the house are all red flags. Outside, you might see small sinkholes, patches of grass that stay greener than the rest, or staining around a cleanout cap. During a NJ home inspection I note these conditions because they often point to an underground issue.
How a sewer line inspection is done
A sewer line inspection uses a camera that is pushed through the cleanout into the pipe. The video shows the entire length of the line out to the street or septic tank. This makes it possible to see cracks, root intrusion, low spots, and blockages. The process is simple, does not damage anything, and gives a clear picture of the pipe’s condition.
The cost of repair or replacement
Repairing or replacing a sewer line is expensive. A small repair can run several thousand dollars. Replacing the entire line can cost $10,000 to $20,000 or more depending on where it runs. If the line goes under a driveway or roadway, costs go up even higher. A failed line can also cause interior damage from backups, which adds even more cost.
Why inspection matters
A camera inspection is not expensive compared to the repair costs. It gives a clear view of what you are buying into. If there is a problem, you know about it before closing. If the line is in good shape, you have peace of mind.
Final thoughts
Sewer lines are out of sight, but they should not be ignored. In New Jersey, with so many older homes and mature trees, sewer line problems are common. A camera inspection is the only way to know the real condition of the pipe.
When I perform a NJ home inspection, I often recommend a sewer line inspection if the home is older, if there are large trees in the yard, or if I see any warning signs. It is better to know ahead of time than to face a costly repair after you move in.
About the Author
I am a New Jersey home inspector with over 25 years of experience. I provide thorough inspections and detailed reports so buyers understand what they are getting into. Learn more at LookSmart Home Inspections