What Causes Sewer Line Problems?
Sewer line problems can cause slow drains, sewage backups, unpleasant odors, and expensive property damage if they’re not addressed quickly. But what causes sewer line problems in the first place?
Sewer pipes can deteriorate for many reasons, including tree root intrusion, aging pipes, shifting soil, and blockages. Some problems develop gradually, while others can cause a sudden sewer backup. Knowing the most common causes can help you recognize potential issues and address them before they become major repairs.
8 Common Causes of Sewer Line Problems
1. Tree Root Intrusion
Tree roots are one of the most common causes of sewer line problems. As roots grow underground looking for water, they can enter small cracks, loose joints, or connections in sewer pipes.
Once inside, roots can continue growing and create a blockage that restricts wastewater flow. Over time, the pressure from growing roots can also damage the pipe itself.
Homes with large, mature trees near underground sewer lines may be particularly vulnerable to root intrusion.
2. Aging or Deteriorating Pipes
Sewer pipes don’t last forever. Older sewer lines can deteriorate due to corrosion, cracking, shifting joints, or general wear and tear.
The material used for the pipe also matters. Older homes may have clay, cast iron, or other materials that can become damaged as they age. Even newer PVC sewer lines can eventually develop problems due to environmental conditions or physical damage.
If you live in an older home and are experiencing recurring sewer issues, a camera inspection can help determine the condition of the existing pipe.
3. Grease and Debris Buildup
Pouring grease, fats, and oils down the drain can contribute to sewer line problems. Although these materials may flow down the drain while they’re warm, they can cool and stick to the inside of the pipe.
Over time, the buildup can restrict the opening and trap other debris.
Other materials, including excessive paper products and items that don’t break down easily, can also contribute to blockages. Only toilet paper and human waste should be flushed down a standard toilet.
4. Shifting or Settling Soil
Movement in the soil surrounding a sewer line can put stress on underground pipes.
As soil shifts or settles, pipes can become misaligned, develop cracks, or separate at their joints. In some cases, a section of pipe can sink and create a low spot known as a belly.
A sewer belly can allow water and sediment to collect in the pipe, increasing the risk of recurring blockages.
5. Pipe Cracks and Breaks
Sewer pipes can crack or break because of age, ground movement, tree roots, construction activity, or other physical stress.
A small crack may initially cause only a minor leak. However, damaged sections can worsen over time and allow surrounding soil or roots to enter the pipe.
Severely damaged pipes may eventually collapse, preventing wastewater from flowing normally.
6. Poorly Connected or Offset Pipes
Sewer pipes are made up of multiple sections connected by joints. If those joints become loose or misaligned, wastewater may leak into the surrounding soil or soil may enter the pipe.
An offset occurs when sections of pipe no longer line up correctly. This can restrict wastewater flow and create a location where debris and roots collect.
Pipe offsets are often identified during a sewer camera inspection.
7. Flushing the Wrong Things
Your sewer system is designed to handle wastewater, toilet paper, and human waste—not household trash.
Flushing items such as wipes, paper towels, feminine hygiene products, diapers, or other non-flushable materials can cause blockages. Even products labeled “flushable” may contribute to problems because they don’t necessarily break down as quickly as toilet paper.
Keeping these materials out of your toilet can help reduce the risk of sewer clogs.
8. Corrosion and Chemical Damage
Some sewer pipes, particularly older metal pipes, can deteriorate because of corrosion. As the pipe walls weaken, they may develop cracks, holes, or rough interior surfaces that collect debris.
Chemical exposure can also contribute to pipe deterioration in certain situations.
Once a sewer line has significant corrosion or structural damage, cleaning the pipe may provide only temporary relief. A plumber may recommend repair or replacement depending on the extent of the damage.
How to Know If You Have a Sewer Line Problem
Sewer line problems don’t always start with a major backup. Early warning signs can include:
- Frequent drain clogs
- Multiple slow drains throughout the house
- Toilets that frequently back up
- Gurgling sounds from drains or toilets
- Sewage odors
- Water or sewage pooling in the yard
- Unusually green or lush patches of grass over the sewer line
- Recurring plumbing problems even after the drain has been cleared
While one clogged sink doesn’t necessarily mean there’s a sewer line problem, you should pay attention if multiple fixtures are affected at the same time. If you see more than one warning sign, the main sewer line may be the source.
How Are Sewer Line Problems Diagnosed?
A sewer camera inspection is one of the most effective ways to determine what’s happening inside an underground sewer line.
A plumber can insert a specialized camera into the pipe to look for:
- Tree root intrusion
- Cracks and breaks
- Corrosion
- Blockages
- Pipe offsets
- Collapsed sections
- Heavy buildup
- Low or bellied sections of pipe
Knowing the specific cause of the problem helps determine whether the sewer line needs cleaning, repair, or replacement.
Get to the Root of Your Sewer Line Problem
Don’t ignore recurring clogs or backups. Doing so will only result in more extensive damage to your sewer line. If you encounter a sewer line problem, get a professional inspection to determine the cause.
Contact Thousand Oaks Plumbing today to schedule a sewer line inspection and get a clear recommendation for the right solution.