Sewer Line Warning Signs You Should Never Ignore

Apr 14, 2026

The sewer line is often the most ignored part of a plumbing system. But, in any home, the main sewer line is the only thing standing between a functional house and wastewater flooding it.

The problem is that most of the main sewer line system lies underground. This means plumbing problems in your Bloomington-Normal, IL home can go unnoticed until they’ve become emergencies. Fortunately, there are subtle (and not-so-subtle) signs of a failing sewer line to look out for. These warning signs mean your sewer line requires immediate professional attention.

Regular drain cleaning is one of the best ways to prevent major sewer line issues. A clean drain is free of blockages and buildup, and it reduces pipe pressure. Summers PHC can assist you in cleaning your drain for only $99. Book your drain cleaning now and enjoy peace of mind this summer. Contact the Summers PHC team for more information. This is a limited-time offer only. (Terms and conditions apply.)

Slow Drains Throughout Your House

Slow drains are a common plumbing issue. One slow drain in the bathroom or kitchen of your Bloomington-Normal, IL home is most likely due to a minor clog. However, if you notice several slow drains throughout your house, it may indicate a problem with the main sewer line. Slow drains in the winter can cause water to build up, which could result in a frozen or burst pipe.

If you ignore slow drains, it can lead to multiple other serious issues. For instance, slow drains can cause sinks, tubs, and toilets to overflow at the most unexpected times. This overflow of water will seep into your walls and flooring (and even the ceiling), where it can cause wood to rot and the floors to warp. The situation can also result in mold and mildew growth, which is a health hazard. In severe cases, a wastewater backup can cause structural damage to your home’s foundation.

Backups and Overflows

When wastewater or sewage backs up into your fixtures, it will most likely happen in the lowest points first. For example, you might notice a backup in the fixtures in your basement. At this point, there is probably already a severe blockage or damage to the main sewer line.

Unpleasant Smells Coming From Drains or Toilets

As soon as you notice unpleasant smells or hear unusual sounds coming from your drains or toilets, take it as a sign that waste is not flowing through your plumbing system as it should. It could also indicate that your sewer line has ventilation issues.

If you run water in all the drains in your home and the smell persists, or if the smell comes from behind walls or under your floors, call a professional plumber for assistance. The same applies to visible backups in your toilets or drains, or gurgling noises in the pipes. While you wait for the plumber to arrive, air out or ventilate your home.

Inconsistent Water Levels in Toilets

Fluctuating water levels in your toilets could be an indicator of a major sewer line problem. You can test the water levels by running the washing machine or dishwasher and checking if the toilet water level decreases or increases at the same time. You can also check whether flushing one toilet affects the water level in another toilet. If you notice these issues, you should contact a plumber for assistance.

Other Warning Signs You Should Never Ignore

You may find other issues that indicate advanced sewer line problems. For instance, if there is an unusually lush or green patch of grass on your lawn, there may be an underground pipe leak. You may also see insects and rodents in the vicinity.

If the sewer issue has affected your home’s foundation, you’ll see cracks in the floors and walls. There may also be damp spots in the lower areas of your house, including the crawl spaces and basements. These damp spots may also have mold growth, which needs to be removed by a plumber.

What to Do If You Suspect a Main Sewer Line Problem

Do not delay in calling a professional for help if you experience any of the above issues. The longer you leave the problem, the worse it will get. If it gets worse, it will cost a lot more to repair or replace the affected parts of your plumbing system.

At a plumber’s visit, you can expect them to follow these steps:

The plumber will advise you to stop all water usage, especially if you already have sewage or wastewater backing up into your fixtures.
The plumber will do a thorough video camera inspection to see where exactly the problem is (and what it is). Main sewer line issues are not always the result of a blockage that comes from the house itself. Sometimes, tree roots can also cause problems.
Once the problem is identified, the plumber will find the main cleanout and start cleaning the sewer line. If there are damaged or broken pipes, the plumber will advise you on whether the broken section or the entire pipe needs to be replaced.

It is critical to hire only a licensed plumber to ensure the repairs and replacements are in line with local government codes.

Summers PHC Can Help You Prevent Main Sewer Line Problems

Do not let sewer line issues ruin your summer. The expert team at Summers Plumbing Heating & Cooling can inspect the plumbing system of your Bloomington-Normal, IL home and advise you on any repairs or replacements. If you already have a main sewer line issue, we can help sort it out before it causes further damage to your home.

Your plumbing system is in safe hands with the experienced Summers PHC team. Contact us at 309-319-9009 for more information or book your plumbing inspection online today. Remember to check our local service specials for Bloomington-Normal homeowners.