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Check and Clear the Plumbing Vent Stack

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How to Diagnose and Fix a Gurgling Toilet · Step 5 of 6

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This guide provides a comprehensive, step-by-step process for diagnosing and resolving the common plumbing issue of a gurgling toilet. The gurgling sound is typically caused by negative air pressure in the drain lines, which is a symptom of a partial or full blockage in the toilet's trap, the branch drain line, or the main plumbing vent stack. The instructions will walk you through a process of elimination, starting with the simplest fixes and progressing to more complex solutions.

This Old House

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FAQs

How long does it typically take to fix a gurgling toilet, and how difficult is this project for a beginner?

Simple fixes like plunging or using a toilet auger might only take 15-30 minutes and are very beginner-friendly. If you need to clear the plumbing vent stack or snake the branch drain line, it could extend to 2-4 hours and requires more attention to detail, but is still manageable for a determined DIYer following the steps.

What essential safety gear should I use when diagnosing and fixing a gurgling toilet?

Always wear safety gloves, such as heavy-duty latex gloves, to protect against unsanitary water and chemicals. Safety glasses are crucial to shield your eyes from splashes. When using power tools like an electric drain auger, ensure you wear appropriate footwear and follow the tool's specific safety instructions.

I've plunged and used a toilet auger, but my toilet still gurgles. What should I try next?

If local clearing doesn't work, the issue is likely further down the plumbing system. Your next step should be to check and clear the main plumbing vent stack on your roof, as a blockage there commonly causes gurgling due to negative air pressure. If that still doesn't resolve it, snaking the branch drain line is the next logical step.

Do I need to buy all the listed tools, especially an electric drain auger, or can I start with more basic equipment?

You can absolutely start with a good plunger and a RIDGID K-3 toilet auger, as these often resolve most common gurgling issues and are relatively inexpensive. An electric drain auger is typically needed for more stubborn or distant blockages in the branch line, and you might consider renting one if you don't anticipate frequent use.

Check and Clear the Plumbing Vent Stack

Advanced

Part of project

How to Diagnose and Fix a Gurgling Toilet · Step 5 of 6

Was this clip helpful?

This guide provides a comprehensive, step-by-step process for diagnosing and resolving the common plumbing issue of a gurgling toilet. The gurgling sound is typically caused by negative air pressure in the drain lines, which is a symptom of a partial or full blockage in the toilet's trap, the branch drain line, or the main plumbing vent stack. The instructions will walk you through a process of elimination, starting with the simplest fixes and progressing to more complex solutions.

Based on content fromThis Old House· 2.2M subscribers

Frequently Asked Questions

How long does it typically take to fix a gurgling toilet, and how difficult is this project for a beginner?

Simple fixes like plunging or using a toilet auger might only take 15-30 minutes and are very beginner-friendly. If you need to clear the plumbing vent stack or snake the branch drain line, it could extend to 2-4 hours and requires more attention to detail, but is still manageable for a determined DIYer following the steps.

What essential safety gear should I use when diagnosing and fixing a gurgling toilet?

Always wear safety gloves, such as heavy-duty latex gloves, to protect against unsanitary water and chemicals. Safety glasses are crucial to shield your eyes from splashes. When using power tools like an electric drain auger, ensure you wear appropriate footwear and follow the tool's specific safety instructions.

I've plunged and used a toilet auger, but my toilet still gurgles. What should I try next?

If local clearing doesn't work, the issue is likely further down the plumbing system. Your next step should be to check and clear the main plumbing vent stack on your roof, as a blockage there commonly causes gurgling due to negative air pressure. If that still doesn't resolve it, snaking the branch drain line is the next logical step.

Do I need to buy all the listed tools, especially an electric drain auger, or can I start with more basic equipment?

You can absolutely start with a good plunger and a RIDGID K-3 toilet auger, as these often resolve most common gurgling issues and are relatively inexpensive. An electric drain auger is typically needed for more stubborn or distant blockages in the branch line, and you might consider renting one if you don't anticipate frequent use.

How to Diagnose and Fix a Gurgling Toilet

How to Diagnose and Fix a Gurgling Toilet

Beginner

This guide provides a comprehensive, step-by-step process for diagnosing and resolving the common plumbing issue of a gurgling toilet. The gurgling sound is typically caused by negative air pressure in the drain lines, which is a symptom of a partial or full blockage in the toilet's trap, the branch drain line, or the main plumbing vent stack. The instructions will walk you through a process of elimination, starting with the simplest fixes and progressing to more complex solutions.

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Videos in this project

Step 1 video 1

Step 1: Observe and Test Fixtures

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Step 1 video 2

Step 1: Observe and Test Fixtures

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Step 1 video 3

Step 1: Observe and Test Fixtures

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Step 2 video 1

Step 2: Plunge the Toilet

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Step 2 video 2

Step 2: Plunge the Toilet

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Step 2 video 3

Step 2: Plunge the Toilet

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Step 3 video 1

Step 3: Clear with a Toilet Auger

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Step 3 video 2

Step 3: Clear with a Toilet Auger

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Step 3 video 3

Step 3: Clear with a Toilet Auger

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Step 4 video 1

Step 4: Snake the Branch Drain Line

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Step 4 video 2

Step 4: Snake the Branch Drain Line

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Step 4 video 3

Step 4: Snake the Branch Drain Line

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Step 5 video 1

Step 5: Check and Clear the Plumbing Vent Stack

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Step 5 video 2

Step 5: Check and Clear the Plumbing Vent Stack

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Step 5 video 3

Step 5: Check and Clear the Plumbing Vent Stack

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Step 6 video 1

Step 6: Reinstall Toilet and Final Test

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Step 6 video 2

Step 6: Reinstall Toilet and Final Test

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Step 6 video 3

Step 6: Reinstall Toilet and Final Test

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