What You Need to Know About Sewer Gas

• Hydrogen sulfide, the main component of sewer gas, smells like rotten eggs and can cause eye irritation, sore throat, coughing, and fatigue.
• While temporary exposure isn’t usually harmful, prolonged exposure can lead to dizziness, headaches, and other serious symptoms.
• Sewer gas is also explosive, so take the smell seriously and address it quickly.

Steps to Take If You Smell Sewer Gas

• Ventilate Immediately
• Open windows and doors to disperse the gas.

• Step away from the affected area while assessing the problem.

• Call a Professional Plumber

• The issue won’t resolve itself and could worsen over time.

• A plumber can diagnose the source and recommend repairs.

• Avoid Ignoring the Smell

• Sewer gas odors may dissipate temporarily but will return unless the issue is fixed.

Common Causes of Sewer Gas Smells

• Dry Water Seals in Traps
• Unused drains or sinks can dry out, allowing sewer gas to escape.

• Run water in rarely used fixtures to refill the trap.

• Damaged or Improperly Installed Pipes

• Leaks or cracks in pipes can allow sewer gases to enter your home.

• Repairs or replacements are essential to address this issue.

• Clogs and Blockages

• Clogged drains prevent proper water flow and can emit foul odors.

• Clean drains regularly to avoid buildup.

• Faulty Sewer Gas Traps

• Gas traps (installed on all plumbing fixtures) may need replacing if they fail.
• Cost: $100 for parts; $45–$200/hour for plumber labor.

How to Prevent Sewer Gas Smells

• Prevent Clogs
• Use trash cans for non-flushable items (e.g., paper towels, hygiene products).
• Install hair traps in showers ($10) to catch debris.

• Professional clog removal costs $215 on average.

• Run Water in Unused Fixtures

• Regularly run water in guest bathrooms or seldom-used sinks to keep traps filled.

• Clean Drains

• Use a drain-cleaning tool ($5) to remove hair, soap scum, and other buildup.
• Perform this regularly to prevent clogs and odors.

When to Call a Plumber

• Persistent odors that don’t resolve with basic fixes.
• Visible signs of leaks or cracks in pipes.
• Water damage near drains or in walls.

Pro Tip: Address sewer gas smells immediately to protect your home and health. Regular maintenance and inspections can save you from costly repairs and unpleasant surprises.

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