How to Fix a Clogged Drain and When to Call a Plumber

What causes drains to clog and what you can do about it

Most drain clogs start with hair, soap buildup, grease, or food particles collecting inside your pipes. In kitchens, cooking oil that hardens as it cools is the main culprit. In bathrooms, hair mixed with soap creates a mat that traps debris. Some clogs form slowly over months; others happen suddenly when something solid gets stuck. The solution depends on where the clog is, how severe it is, and what caused it.

You can often clear a slow drain yourself using tools and methods that cost nothing or very little. For stubborn clogs deep in your pipes or in the main line serving your whole house, you will need a plumber with a motorized snake or hydro-jetting equipment. Knowing which approach fits your situation saves you money and time.

Key Takeaways

• Hair, grease, and soap buildup cause most residential clogs, and you can prevent many by using drain screens and disposing of cooking oil in the trash rather than down the sink.
• A plunger works best on clogs near the drain opening; a plumbing snake works on clogs deeper in the line; chemical drain cleaners can damage old pipes and should be a last resort.
• If water backs up into multiple fixtures, the clog is likely in your main sewer line and requires a licensed plumber with specialized equipment.
• Plumbers charge by the hour or by the job; asking for an estimate before work begins protects you from surprise costs.

Clearing a clog yourself with a plunger or snake

A standard cup plunger works on sink clogs if you fill the sink with a few inches of water and plunge vigorously for 15 to 20 seconds. For a double sink, plug the overflow hole or the second drain with a wet cloth so the plunger creates suction. A flange plunger (the kind with a rubber cup inside the main cup) works better on toilet clogs. Push down and pull up repeatedly without breaking the seal; you should feel resistance give way when the clog clears.

If plunging does not work, a hand-crank plumbing snake costs $15 to $30 and can reach clogs 15 to 25 feet down the line. Feed the snake into the drain, crank the handle to spin the tip, and push forward when you feel resistance. The spinning tip either breaks up the clog or hooks hair so you can pull it out. Motorized snakes rent for $40 to $60 per day from hardware stores and work faster on tough clogs, but they require practice to use safely.

When chemical drain cleaners make sense and when they don't

Chemical drain cleaners dissolve hair and soap quickly and cost $5 to $15 per bottle. They work best on slow drains caused by buildup rather than solid blockages. Pour the recommended amount down the drain, wait the time the label specifies (usually 15 to 30 minutes), and flush with hot water. Wear gloves and eye protection, and never mix different brands or types of cleaners.

Chemical cleaners damage cast iron, galvanized steel, and older PVC pipes over time, and they create toxic fumes if mixed with other products. If you have an old house, a septic system, or a clog that has not responded to plunging, skip the chemicals and call a plumber instead. Once you pour a chemical down the drain, a plumber may refuse to work on that line until it has been flushed thoroughly, which adds cost and delay.

Signs you need a professional plumber

Call a plumber if water backs up into your shower, toilet, or second sink when you use another fixture. This means the clog is in your main sewer line, which is buried underground and requires a motorized snake (called a rooter) or hydro-jetting equipment that only plumbers own. A plumber will send a camera down the line first to see exactly where the clog is and what caused it—sometimes tree roots grow into the pipe, or the line has collapsed.

Also call a plumber if a clog returns within a few weeks after you clear it, if the drain smells like sewage, or if you see water pooling in your yard or basement. These signs point to a problem deeper than surface buildup. A plumber can diagnose the real issue and fix it permanently rather than treating the symptom.

What to expect when a plumber comes to your house

Most plumbers charge either an hourly rate (typically $75 to $150 per hour in South Carolina) or a flat rate for a specific job like clearing a drain. Ask for an estimate before work begins so you know the cost. The plumber will inspect the clog, choose the right tool, and explain what they are doing. If they find a bigger problem—a cracked pipe, tree roots, or a collapsed section—they will tell you what repair options exist and what each costs.

The actual clearing usually takes 30 minutes to two hours depending on how far down the clog is and how stubborn it is. After clearing the line, a good plumber will run water through to make sure the clog is completely gone and the water drains at normal speed. Ask them to show you what came out if you want to know what caused the problem, and ask what you can do to prevent it from happening again.

Preventing clogs before they start

Install a drain screen or strainer in every sink and shower to catch hair and food particles before they enter the pipe. These cost $2 to $8 and take 10 seconds to clean. In the kitchen, never pour cooking oil or grease down the drain—let it cool and solidify, then scrape it into the trash. Wipe greasy pans with a paper towel before washing them. In the bathroom, pull hair out of the drain weekly and throw it away rather than letting it accumulate.

Run hot water down your drains once a week to help dissolve soap buildup. If you have a garbage disposal, run cold water while it operates and for 15 seconds after, then flush with hot water. Do not put fibrous foods like celery, potato peels, or coffee grounds down the disposal—they wrap around the blades and cause jams. These simple habits prevent most clogs from forming in the first place.

Frequently Asked Questions

Is it safe to use a plunger on a toilet if it has already overflowed?

Yes, but turn off the water supply first by closing the valve behind the toilet. If the bowl is full, bail out some water into a bucket so you have room to plunge without splashing. Use a flange plunger designed for toilets, not a cup plunger meant for sinks. Plunge firmly 15 to 20 times, then check if the water drains.

Can I use a plumbing snake on a toilet without damaging it?

A hand-crank snake can work on toilet clogs, but it is easy to scratch the porcelain. Wrap the snake tip with a cloth or use a toilet-specific auger, which has a protective sleeve. If you are not comfortable doing this, a plumber can clear it safely in minutes.

What should I do if I accidentally mixed two different drain cleaners?

Stop immediately and leave the area—mixing cleaners creates toxic chlorine gas. Open windows and doors for ventilation. Do not pour anything else down the drain. If you feel dizzy or have trouble breathing, go outside and call 911. Once the fumes clear, flush the drain thoroughly with water before attempting any other method.

How much does it cost to have a plumber clear a drain in South Carolina?

Costs vary by plumber and location, but a basic drain clearing typically runs $150 to $300 for a single fixture. If the clog is in your main sewer line or requires specialized equipment like hydro-jetting, the cost is higher. Always ask for an estimate before the plumber starts work.

Why does my drain smell bad even though water drains normally?

Slow-moving water and trapped debris create odors even when the drain is not completely blocked. Run hot water mixed with baking soda down the drain, followed by vinegar, and let it sit for 30 minutes before flushing. If the smell persists, a plumber can inspect the line to rule out a crack or a deeper problem.