Feb 26,2026

Why Your Septic Tank Smells (And How to Fix It)

As a property owner, knowing how your septic system operates can help you make informed decisions and keep your system in good working order. You’d think that your on-site wastewater treatment system is smelly, but the reality is that it should not smell. If you notice a foul odor or rotten egg-like smells emanating from your septic system, call Rooter Man Plumbing for professional help. Our septic service team can inspect, diagnose, and determine the best course of action to get things back to how they should be.

Should a Septic System Smell?

As mentioned, a properly maintained and functional septic system should not smell. Septic systems are designed to keep sewage and foul smells within the confines of the tank. However, there are certain situations where these toxic gases escape from the tank and even infiltrate your living spaces. Fortunately, routine septic tank pumping and cleaning in Agua Dulce, CA can resolve the problem by addressing the root cause. You don’t have to waste money on chemical cleaners or other DIY methods that often provide temporary relief.

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Causes of Septic Tank Smells

Foul smells from your wastewater treatment system suggest it is not processing waste properly, or it’s time for professional pumping. Over time, grease, oils, and solids accumulate in the tank and cause unpleasant smells. Other common causes of septic smells to look out for include:

A Cracked Soil Stack

One of the most common reasons for bad odors seeping into your home is a cracked soil stack. Once wastewater from your home collects in the tank, it separates into three layers: effluent, scum, and sludge. Liquid waste then flows into the drain field through a horizontal and vertical pipe. The soil stack refers to the vertical pipe that often runs the length of the building. A crack or break in this line could be the cause of foul drain smells.

Anaerobic Bacteria

Septic systems rely on beneficial bacteria to break down solid waste in the tank, releasing foul smells as a result of this process. If your system does not have sufficient oxygen in the tank, these bacteria can transform into anaerobic organisms. The main drawback of anaerobic bacteria is that they are ineffective at digesting organic waste, unlike aerobic bacteria. Improper waste breakdown can cause sludge to build up and foul smells to escape.

Blocked Drains and Soakways

Another common cause of foul sewer smells is fully or partially blocked drains or soakways. You can confirm if this is the problem by regularly inspecting your drains and hiring a septic company to confirm that they are the problem. A noticeable indicator besides foul smells is slow flow, as clogged drains take longer to remove water. Professional septic cleaning can effectively clear accumulated waste and restore freshness to your living spaces without compromising functionality.

How to Get Rid of Septic Tank Smells in Your House

Now that you know common causes of foul septic smells, knowing how to resolve the problem is key to indoor and outdoor comfort. The most effective way to stop sewer smells from entering your home is to flush out anaerobic bacteria. While this is possible with DIY treatments, it is essential to leave beneficial bacteria behind.

If the smell is outside near the tank or drain field, it means you are due for professional septic maintenance. A licensed technician can measure wastewater in the tank and create a tailored plan that involves routine inspections and pumping.

At Rooter Man Plumbing, we offer exceptional septic services, including maintenance and repairs at competitive rates. Do not wait until small issues worsen and cause devastating damage and hazardous scenarios. Contact us today to get ahead of septic problems that can disrupt your daily activities if left unattended.