How To Get Rid Of Septic Smell Outside

Nothing ruins an outdoor barbecue faster than the unpleasant stench from a septic system. A properly working septic tank shouldn’t produce strong odors, so a foul sewage smell outside likely means something needs attention in your system.

This article covers common causes of outdoor septic odors and effective remedies. We’ll examine:

  • Where septic smells originate
  • Reasons septic systems emit odors
  • Quick fixes for eliminating smells
  • Preventative measures and proper maintenance
  • When to call a septic professional

Learning what makes septic systems stink and how to stop the smells can help you restore outdoor enjoyment and keep your septic in good working order.

Where Do Septic Odors Come From?

First, it helps to understand where septic smells originate. The main sources of outdoor septic odors include:

  • The septic tank itself
  • The drain field or leach field
  • Sewer vent pipes
  • Clogged drains or broken pipes
  • Improper tank chemistry

Gases like hydrogen sulfide, methane, and ammonia are byproducts of waste decomposition inside the septic tank. Normally, the sealed tank contains these odors. But problems can cause them to leak out.

Why Does My Septic System Smell Outside?

When septic stench invades your yard, it means gases are escaping the system. Here are some reasons septic odors might reach the outdoors:

Tank defects – Cracked or warped lids and access points allow odor to leak from the tank.

Vent blockages – Clogged roof vent pipes prevent proper air circulation to dissipate smells.

Drainbackups – Blocked drains or broken pipes leak sewer gases outside.

Overfull tank – An overloaded tank with too much sludge forces gases out through outlets.

Soil saturation – Soggy drain field soil can’t filter smells from effluent.

Improper pH – If tank pH gets too acidic, more hydrogen sulfide odor occurs.

Nearby access points – Vents or drains near patios let smells reach outdoor living areas.

Most causes stem from preventable septic system issues. Taking proactive maintenance steps can minimize odors.

Quick Fixes for Eliminating Outdoor Septic Odors

Here are some quick DIY remedies that may help eliminate an outdoor sewage stench:

  • Add baking soda or a biological additive to the tank to balance pH.

  • Use an enzyme treatment to break down excess waste and sludge.

  • Check and clear any clogged roof vent pipes.

  • Seal cracks or gaps in tank lids with caulk or weather strips.

  • Flush drains well and use a drain cleaner to remove debris and blockages.

  • Reduce water usage to allow the tank time to stabilize.

  • Extend vent pipes higher to better dissipate smells.

  • Install carbon vent filters to absorb odors escaping the vent.

These easy fixes address common causes of septic odor leaks. But prevention is still the best medicine when it comes to septic smells.

Preventing Outdoor Septic Odors Long-Term

Stopping smells before they start is the optimal solution. Here are some key prevention tips:

Pump regularly – Periodic septic pumping removes sludge before it’s excessive.

Inspect annually – Check components to identify and address defects early.

Use septic-safe products – Avoid bleach, chemicals, and additives that harm helpful bacteria.

Conserve water – Limit usage to prevent overloading the system.

Protect pipes and tanks – Keep vehicles away to prevent damage.

Maintain proper pH – Use baking soda and enzymes to balance the tank chemistry.

Keep good records – Track maintenance for early problem detection.

Educate household members – Ensure everyone follows septic-safe practices.

Proactive septic maintenance ensures your system functions properly and contains odors. Prevention is well worth the effort.

When Should You Call a Septic Professional?

In some cases, bothersome septic smells outside indicate it’s time to bring in an expert:

  • If quick fixes don’t eliminate persistent odors

  • For suspected vent pipe damage or blockages

  • If you find saturated soil or pooling over the drain field

  • For major tank defects like cracked lids or risers

  • If drains keep backing up after attempted clearing

  • For routine inspections and maintenance

  • If the tank may be overdue for pumping

  • If you’re unsure about the tank’s chemical balance

  • For suspected pipe or drain line breaks or blockages

Only professionals have the tools and skills to fully diagnose and remedy more complex septic odor causes. They can also provide maintenance to prevent future issues.

Odor Troubleshooting Tips for Septic Professionals

Septic professionals have advanced techniques for tracking down and resolving stubborn sewage stench issues:

  • Use a sewer camera to inspect drain lines and field pipes for blockages or damage.

  • Test tank sludge and scum levels to see if overloading contributes to odors.

  • Check pH balance and add bacterial treatments if tank chemistry is off.

  • Inspect vent pipes for proper height and airflow impediments.

  • Perform dye testing to check for leaks indicating cracked tanks or pipes.

  • Monitor drainage field for overly wet soils or effluent surfacing.

  • Evaluate structural integrity of lids, risers, and access points.

  • Review homeowner maintenance records for any gaps that could cause problems.

Thorough inspections paired with preventative maintenance will keep outdoor septic smells at bay.


While the occasional sewer whiff near your septic components may be normal, strong outdoor septic odors shouldn’t be tolerated. By understanding the most common causes, homeowners can take steps to quickly eliminate smells and prevent recurrence. But if quick fixes and proper maintenance don’t solve persistent septic stench, rely on the pros to get your system odor-free once again.

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