Why Does My Drain Keep Clogging? 7 Common Causes and How to Stop It

waves of water signifying water flowing relating to plumbing services
PVC drain pipe repair and professional drain cleaning service in Bedford, NH by Flow Pro Plumbing and Drain Cleaning

Few plumbing problems are as frustrating as a drain that keeps clogging. You clear the blockage, everything seems fine for a while, and then the drain slows down or backs up again. If this sounds familiar, there’s likely an underlying issue that needs professional attention.

Recurring clogs are often a sign that something more serious is happening inside your plumbing system. Understanding the common causes can help you prevent future problems and know when it’s time to call a professional.

At Flow Pro Plumbing and Drain Cleaning, we provide expert drain cleaning services throughout New Hampshire, helping homeowners eliminate stubborn clogs and keep their plumbing systems flowing properly. Here are seven of the most common reasons your drain keeps clogging—and what you can do about it.

1. Grease and Cooking Oil Build-Up

One of the leading causes of clogged kitchen drains is grease.

While grease may go down the drain as a liquid, it quickly cools and hardens inside your pipes. Over time, it traps food particles, soap residue, and other debris, creating stubborn blockages.

How to Prevent It

  • Never pour grease or cooking oil down the drain.
  • Dispose of grease in a sealed container after it cools.
  • Wipe greasy pots and pans with a paper towel before washing them.

 

If grease buildup has already formed, professional drain cleaning can safely remove the blockage without damaging your pipes.

2. Hair Buildup in Bathroom Drains

Hair is one of the biggest culprits behind clogged bathroom sinks, tubs, and showers.

As hair travels through the drain, it combines with soap scum and other debris to form dense clogs that become increasingly difficult to remove.

How to Prevent It

  • Install drain strainers in showers and sinks.
  • Remove visible hair regularly.
  • Schedule routine drain cleaning if multiple bathroom drains are slowing down.

 

3. Soap Scum Accumulation

Many traditional bar soaps contain fats that leave behind residue inside plumbing pipes.

Over time, soap scum narrows the pipe’s diameter, making it easier for debris to collect and create recurring clogs.

Prevention Tips

  • Flush drains regularly with hot water.
  • Consider switching to liquid soap when possible.
  • Schedule professional drain maintenance to remove buildup before it causes problems.

4. Tree Roots in Sewer Lines

If multiple drains throughout your home are clogging repeatedly, the problem may not be inside your home at all.

Tree roots naturally seek moisture and can enter tiny cracks in underground sewer lines. Once inside, they continue growing until they restrict or completely block wastewater flow.

Common warning signs include:

  • Multiple slow drains
  • Gurgling toilets
  • Sewage odors
  • Sewer backups
  • Frequent drain clogs

 

Professional camera inspections and drain cleaning services can identify root intrusion before it causes extensive sewer damage.

5. Flushing Items That Don't Belong

Toilets are designed to handle only human waste and toilet paper.

Unfortunately, many homeowners accidentally create recurring drain problems by flushing:

  • “Flushable” wipes
  • Paper towels
  • Feminine hygiene products
  • Cotton swabs
  • Dental floss
  • Baby wipes

 

Even products labeled as flushable often fail to break down properly and can create stubborn blockages.

6. Damaged or Aging Pipes

Older plumbing systems may experience:

  • Corrosion
  • Pipe scale
  • Cracks
  • Pipe sagging
  • Mineral buildup

 

These issues restrict water flow and create places where debris can easily collect.

If your home is older or you’ve experienced recurring plumbing issues for years, professional pipe inspection may reveal that pipe repair is necessary in addition to drain cleaning.

7. A Main Sewer Line Blockage

When several drains clog at the same time, the issue may involve your home’s main sewer line.

Common symptoms include:

  • Multiple backed-up fixtures
  • Toilets bubbling when sinks drain
  • Water backing up into tubs or showers
  • Sewage odors
  • Frequent backups after rain

 

Main sewer line problems require immediate attention to prevent wastewater from backing up into your home.

Professional drain cleaning equipment and sewer camera inspections can accurately diagnose the issue.

Why Store-Bought Drain Cleaners Usually Don't Solve the Problem

Many homeowners reach for chemical drain cleaners hoping for a quick fix.

Unfortunately, these products often:

  • Only partially remove clogs
  • Damage plumbing pipes
  • Harm older plumbing systems
  • Fail to remove the root cause
  • Create recurring blockages

 

Professional drain cleaning services use specialized equipment designed to thoroughly clear pipes without causing unnecessary damage.

When Should You Call Flow Pro Plumbing and Drain Cleaning?

It’s time to contact a plumber if you notice:

  • Recurring clogs
  • Slow-draining sinks
  • Gurgling drains
  • Foul odors
  • Standing water
  • Multiple clogged fixtures
  • Water backing up into other drains

 

Ignoring these warning signs often leads to larger plumbing repairs and more expensive damage.

Benefits of Professional Drain Cleaning

Routine professional drain cleaning helps homeowners:

  • Remove stubborn clogs
  • Improve drainage
  • Eliminate odors
  • Prevent sewer backups
  • Extend the life of plumbing pipes
  • Reduce emergency plumbing repairs

 

Preventative maintenance is often far less expensive than emergency service after a major blockage.

Why Homeowners Choose Flow Pro Plumbing and Drain Cleaning

Flow Pro Plumbing and Drain Cleaning proudly provides dependable drain cleaning services throughout New Hampshire. Our experienced team is committed to delivering honest recommendations, fast response times, and quality workmanship on every job. Using professional equipment and proven techniques, we clear stubborn clogs, perform sewer camera inspections, and complete expert pipe repairs to restore your plumbing system’s performance.

Whether you’re dealing with a slow kitchen sink, recurring shower clogs, or a blocked sewer line, you can count on our friendly, knowledgeable plumbers to accurately diagnose the problem and provide a reliable, long-lasting solution. We’re dedicated to exceptional customer service and helping homeowners keep their plumbing systems flowing smoothly year-round.

Stop Recurring Drain Clogs for Good

A drain that keeps clogging is usually trying to tell you something. While occasional clogs happen, repeated backups often indicate a deeper plumbing issue that shouldn’t be ignored.

If you’re tired of constantly reaching for a plunger or chemical drain cleaner, professional help can restore your plumbing system and help prevent future problems.

Contact Flow Pro Plumbing and Drain Cleaning today to schedule professional drain cleaning services. Our experienced team will diagnose the cause of your recurring clogs and provide reliable, long-lasting solutions to keep your drains flowing freely.