The Biggest Mistakes Homeowners Make with Their Drains & Sewer Lines (and How to Avoid Them)

A slow drain turns into a complete backup. A minor clog becomes a cracked sewer line. What started as a small annoyance is now an emergency that requires digging up your yard.

The Knoxville drain and sewer experts at The Plumbing Authority have worked on thousands of homes over the past 30 years, and most of the serious drain and sewer problems we see could have been prevented. The issue isn’t that homeowners don’t care about their plumbing—it’s that certain habits and shortcuts seem harmless until the damage is already done.

Here are the most common mistakes we see with drains and sewer lines in East Tennessee, and what you can do to avoid expensive repairs down the road.

Relying on Chemical Drain Cleaners (The Most Common)

This is the mistake we see most often. Your kitchen sink drains slowly, so you grab a bottle of chemical drain cleaner from the store. It seems to work temporarily, so you keep using it whenever things slow down.

The problem? Those chemicals are harsh. They can eat through clogs, but they also eat through your pipes, especially if you have older plumbing. The heat they generate can damage PVC pipes and corrode metal ones. You might clear the clog temporarily, but you’re causing long-term damage that leads to leaks and pipe failures.

Chemical cleaners also rarely solve the root problem. If you’ve got a partial blockage from grease buildup or tree root intrusion, pouring chemicals down the drain just pushes the issue further down the line. It’ll come back, usually worse than before.

For persistent slow drains, professional drain cleaning in Knoxville addresses the actual blockage without damaging your pipes. Methods like hydro jetting use high-pressure water to clear buildup completely, leaving your pipes clean and undamaged.

Ignoring Slow Drains Until They Stop Completely

Water taking a little longer to drain seems minor, so most people put off dealing with it. Then one day the drain stops working entirely, usually at the worst possible time.

Slow drains tell you something’s building up in your pipes. Could be hair, soap residue, grease, or mineral deposits. The longer you wait, the worse it gets. What could have been a simple cleaning turns into a major blockage that backs up into your home or yard.

This applies to all drains—sinks, showers, tubs, and toilets. If water isn’t draining as quickly as it should, don’t wait until it’s an emergency. Getting it checked early saves time and money.

Treating Your Toilet Like a Trash Can

Toilets are designed to handle human waste and toilet paper. That’s it. But people flush all kinds of things that seem like they should be fine: wet wipes (even the ones labeled “flushable”), cotton swabs, dental floss, feminine hygiene products, paper towels, cat litter.

Those items don’t break down like toilet paper. They accumulate in your pipes and sewer line, creating blockages that require professional intervention. Flushable wipes are particularly deceptive—they might go down initially, but they don’t disintegrate and often cause major clogs further down the line.

When your toilet keeps backing up or you’re dealing with recurring clogs, what you’ve been flushing is often the culprit. Keep a trash can in the bathroom and use it.

Pouring Grease Down the Kitchen Drain

Grease seems liquid when it’s hot, so people assume it’s safe to pour down the drain if they run hot water with it. It’s not.

Grease solidifies as it cools. It sticks to the inside of your pipes, accumulating over time and trapping other debris. Eventually you’ve got a stubborn clog that won’t budge with a plunger or drain snake. In Knoxville’s older homes with cast iron or clay sewer lines, grease buildup combines with tree root intrusion to create major blockages.

Pour grease into a container, let it solidify, and throw it in the trash. Wipe greasy pans with paper towels before washing them. It’s a small change that prevents big problems.

Skipping Regular Drain and Sewer Maintenance

Most homeowners don’t think about their drains and sewers until something goes wrong. But regular maintenance prevents most problems before they start.

Annual or bi-annual professional cleaning removes buildup before it causes blockages. Video inspections catch developing issues like tree root intrusion, pipe corrosion, or cracks before they lead to backups or collapses.

This is especially important for older homes in East Tennessee. Many properties have aging sewer lines that are vulnerable to tree roots, shifting soil, and general deterioration. Catching these issues early means you can plan for repairs on your schedule instead of dealing with an emergency.

DIY Repairs That Make Things Worse

There’s nothing wrong with using a plunger or a drain snake for minor clogs. But when those don’t work and people start taking pipes apart without knowing what they’re doing, or forcing drain snakes past resistance and damaging pipes, or mixing different chemicals together, small problems become expensive disasters.

If basic DIY methods don’t solve the problem quickly, stop and call a professional. Licensed plumbers have the tools and knowledge to diagnose what’s actually causing the issue without making it worse. They can also identify whether you’re dealing with a simple clog or a more serious problem like a damaged sewer line.

Ignoring Warning Signs of Sewer Line Problems

Sewer line issues don’t always announce themselves clearly. Sometimes the signs are subtle: multiple drains backing up at the same time, gurgling sounds from your toilets, sewage odors in your yard, unexplained patches of extra-green grass, or water pooling in your yard for no apparent reason.

These indicate your main sewer line might be blocked or damaged. Tree roots are a common culprit in Knoxville, especially with older clay pipes. Roots seek out moisture and can infiltrate even small cracks, eventually causing major blockages or pipe collapse.

Getting a professional inspection when you notice these signs can save you from a full sewer line emergency. Modern camera inspections let plumbers see exactly what’s happening inside your sewer line without digging up your yard. From there, you’ve got options depending on the severity—cleaning out roots, spot repairs, or in more severe cases, sewer line replacement.

Protecting Your Drains and Sewer Lines

Most drain and sewer problems develop gradually. Small habits add up over time, and by the time you notice an issue, the damage is already significant.

The good news is that most of these problems are preventable. Don’t pour grease down drains. Don’t flush anything except waste and toilet paper. Address slow drains promptly. Schedule periodic maintenance. Get your sewer line inspected if you have an older home or mature trees near your line.

When problems do develop, handle them correctly from the start. Skip the chemical cleaners and call for professional plumbing services that actually solve the problem without damaging your pipes.

If you’re dealing with slow drains, recurring clogs, or any of the warning signs we’ve covered, don’t wait until it becomes an emergency. 

Contact The Plumbing Authority and we’ll diagnose what’s actually going on and fix it right the first time!

Call (865) 245-5251

Learn More About Drain & Sewer Services in Knoxville & Beyond

Check out our blog posts below for some helpful info, expert tips and more!

• Things You Should Never Put Down Your Drain
• What Actually Happens When You Use a Chemical Drain Cleaner
• DIY vs. Professional Drain Cleaning: When to Call a Knoxville Pro
• 7 Common Causes of Clogged Drains (and How to Solve Them)
• The Ultimate Knoxville Home Drain Maintenance Checklist