One of the biggest misconceptions I see among homebuyers and investors is assuming that a standard home inspection includes a sewer inspection.

It doesn't.

Most home inspectors only look at visible plumbing fixtures. They may run water at sinks, tubs, and toilets, but thats about it. The most expensive part of your plumbing is where you cannot see it.

Underground.

Older properties have are more likely to experience sewer line problems but it's just as important on newer properties. A damaged sewer line can turn into a major expense that catches investors completely off guard. For the cost of a sewer scope, you can get a much clearer picture of the plumbing system, potentially save thousands, and negotiate a better purchase price.

Depending on the issue, costs can range from a few hundred dollars to well over $10,000.

Why Do Roots Grow Into Sewer Lines?

Tree roots naturally seek moisture and nutrients. Even the smallest opening in a sewer pipe can release enough moisture to attract roots. Once roots find an entry point, they will not stop growing inside the pipe unless properly fixed.

Common causes include:

• Cracked clay sewer pipes
• Separated pipe joints
• Deteriorated cast iron sewer lines
• Improperly installed repairs
• Offset connections caused by settling

Over time, roots can create blockages, catch debris, and will eventually cause backups into the home.

What Trees Are Most Commonly Associated With Sewer Root Problems?

While any tree can potentially impact a sewer line, some species are known for aggressive root systems:

• Willow trees
• Silver maple trees
• Poplar trees
• Sweetgum trees
• River birch trees
• Large oak trees
• Sycamore trees
• Magnol tress

These trees may add an aesthetic appeal to the property but if the roots are growing into your piping system you will need proper and regular maintenance.

Can Roots Grow Into Brand-New PVC Sewer Lines?

Yes.

Many people assume replacing a sewer line with PVC permanently eliminates root intrusion. While PVC is significantly more resistant than clay or cast iron, root problems can still occur.

Roots typically find entry points at:

• Improperly glued fitting
• Poorly sealed gaskets
• Misaligned connections
• Damaged cleanouts
• Settlement-related joint separation

I’ve inspected newer PVC sewer systems that developed root intrusion because of installation issues or movement in the surrounding soil.

The lesson: a new sewer line is only as good as its installation.

What Investors Should Do During Due Diligence

For properties with:

• Mature trees
• Homes over 20 years old
• Cast iron, clay, or Orangeburg sewer systems
• History of slow drains
• Frequent drain cleaning invoices

A sewer scope is often one of the highest-return inspections you can purchase.

A camera inspection can identify:

• Root intrusion
• Cracks
• Bellies (low spots holding water)
• Offset joints
• Pipe material
• Previous repairs
• Potential future liabilities

My Recommendation

Before purchasing any investment property, know the condition of the sewer system. A sewer scope typically costs a fraction of what a major sewer repair costs and can provide leverage during negotiations.

Have any investors here discovered a sewer issue after purchasing a property? I’d be interested to hear what you found and what the repair ended up costing.

Feel free to ask me any questions as it pertains to your sewer line system and I'd be happy to share my expertise!