How do you know if a sewer line needs to be replaced?

June 6, 2025

Your home's sewer line is one of the most critical parts of its plumbing system. When it begins to fail, it can cause everything from foul odors to major property damage. Catching problems early can save you thousands of dollars and a ton of headaches. But how do you know if a sewer line needs to be replaced? Let’s dive deep into the signs, symptoms, and solutions.

Key Takeaways

  • Frequent clogs, foul odors, soggy lawns, and foundation cracks are major red flags that your sewer line may be damaged or clogged.
  • Not all issues require a full replacement — some may be due to clogs in the main sewer line. Identifying the difference is crucial for proper treatment.
  • Broken drain pipes underground can cause subtle issues like mold growth, yard depressions, and pest infestations — a professional inspection is essential to uncover them.
  • Methods like camera inspections, smoke testing, and hydrostatic pressure testing provide accurate diagnoses that DIY methods can't match.
  • Mike’s Plumbing and Rooter Service offers 24/7 emergency support, experienced technicians, and cutting-edge technology to handle everything from minor clogs to full sewer line replacements — efficiently and affordably.

How do I know if my sewer line is broken?

A broken sewer line isn’t something you want to ignore. Here are the most common signs:

  • Frequent Backups and Clogs: If multiple drains in your home are frequently clogging, it’s a strong indicator of a sewer line issue rather than just a local blockage.
  • Foul Odors: A broken sewer line often leaks wastewater, causing a persistent sewage smell inside or outside your home.
  • Lush Patches of Grass: Sewage acts like a fertilizer. If you notice unusually green patches in your yard, it could be leaking wastewater from a cracked sewer line.
  • Soggy Yard: Wet, marshy areas in your lawn, especially when it's not raining, suggest a leaking underground sewer pipe.
  • Foundation Cracks or Sinkholes: In severe cases, a broken sewer line can cause ground erosion, leading to structural damage around your home.


If you spot any of these signs, it’s crucial to get a professional inspection quickly.


How do you tell if a main sewer line is clogged?

Sometimes it's not a full replacement that's needed, but a clog that must be cleared. Here’s how to tell:

  • Slow Drains Across Multiple Fixtures: If every drain is slow (toilets, sinks, tubs), it points to a main line clog.
  • Gurgling Sounds: Strange gurgling or bubbling noises from toilets or drains often indicate trapped air caused by a blockage.
  • Water Backup in Odd Places: For instance, flushing the toilet causes water to back up in the shower. That’s a clear sign of a mainline problem.
  • Overflowing Cleanout: Check your home's sewer cleanout (a capped pipe usually outside) — if it's overflowing, it means there’s a blockage.


Ignoring a clogged sewer line can result in wastewater backing up into your home, so prompt professional help is key.


How do you tell if a drain pipe is broken underground?

Underground pipes can break due to shifting soil, tree root intrusion, age, or ground freezing and thawing cycles. Here’s what to look out for:

  • Persistent Bad Smells: If you constantly smell sewage around your property, you could have a broken underground pipe.
  • Visible Depressions: Sections of your yard sinking or dipping could indicate that the soil underneath is being eroded by leaking sewage.
  • Mold Growth: Sewer leaks under the house can create moisture that leads to mold growth inside walls or floors.
  • Rodent and Insect Infestations: Rats, roaches, and other pests are attracted to broken sewer and drain lines.


Detecting underground damage early requires attention to subtle signs and often a camera inspection performed by a professional plumber.

How do I test my main sewer line?

If you suspect issues with your main sewer line, professional testing is your best move. Here are the main methods used:

  • Camera Inspection: A small, waterproof camera is inserted into the sewer line to visually confirm breaks, clogs, or intrusions.
  • Smoke Testing: Smoke is pumped into the sewer system to find cracks or leaks — if smoke escapes into your yard or home, there’s a break.
  • Hydrostatic Pressure Testing: This involves sealing off the sewer system and filling it with water to see if it holds pressure, revealing any leaks.
  • Dye Testing: Special dyes are flushed through the system to see if and where they emerge outside the pipes.


DIY methods might offer clues, but a professional diagnosis ensures you get an accurate picture — and the right solution.


How Mike's Plumbing and Rooter Service Can Help You

Dealing with a sewer line issue can be stressful and messy. That's where Mike's Plumbing and Rooter Service comes in. Their experienced team uses the latest technology, like high-definition camera inspections and trenchless repair options, to diagnose and fix your sewer problems fast and efficiently.


Whether it’s a stubborn clog, a cracked pipe, or a full line replacement, Mike’s Plumbing and Rooter Service can handle it, with minimal disruption to your home and yard.


Why You Should Choose Mike's Plumbing and Rooter Service

  • 24/7 Emergency Services: Sewer problems don’t stick to a 9-to-5 schedule, and neither does Mike’s team.
  • Experienced Technicians: Highly trained pros ensure accurate diagnosis and quality repairs.
  • Upfront Pricing: No hidden fees, no surprises — just honest, fair quotes.
  • State-of-the-Art Equipment: From cameras to trenchless repair tools, they invest in technology to save you time and money.
  • Customer Satisfaction Guarantee: Mike’s Plumbing and Rooter Service isn’t happy until you are.


When it comes to your sewer system, don’t trust just anyone. Trust the local experts with years of happy customers behind them.

Conclusion

Your sewer line plays a vital role in maintaining a safe and functional home. From foul odors and frequent clogs to soggy yards and foundation issues, the signs of a failing or clogged sewer line should never be ignored. Early detection and prompt action can save you from costly repairs and health hazards.


Whether it’s a minor blockage or a major break, having a trusted professional like Mike’s Plumbing and Rooter Service on your side makes all the difference. With advanced tools, skilled technicians, and a commitment to customer satisfaction, Mike’s is ready to help you protect your home and peace of mind. Don’t wait for a small issue to become a big problem — get your sewer line checked today.

Frequently Asked Questions

  • Can tree roots break my sewer line?

    Yes, tree roots are a leading cause of cracked and blocked sewer lines, especially in older pipes.

  • How long does it take to replace a sewer line?

    Depending on the method, it can take anywhere from one day (for trenchless repair) to several days for full excavation replacements.

  • Will homeowners insurance cover sewer line repairs?

    Sometimes. Coverage depends on your policy and whether the damage is sudden or due to neglect.

  • Is a sewer line replacement expensive?

    Costs vary based on the extent of damage and the repair method, but investing early prevents larger, costlier issues.

  • How often should sewer lines be inspected?

    Every 2–3 years, especially if your home is older or surrounded by mature trees.

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