If your aerobic septic system stinks, it is not working properly.
Sure, the contents inside your system are pretty “crappy,” but you shouldn’t be able to smell them at all.
The most common cause of foul odor coming from your aerobic septic system is an aeration issue.

Air pump failure
Your aerobic system requires good air flow in order to function properly. Your aerobic unit is aerated with an air pump so that the bacteria in the clarifier chamber can survive. You need these healthy and abundant bacteria living inside your chamber so that they can help break down your sewage.
When you have an aeration issue, your septic alarm will sound (but not always!).
When your aerator (air pump) is not functioning properly, the bacteria inside your clarifier chamber die. Now your tank is considered dead (“septic”), and it will begin to leak odors out into the open air.

Clogged stones in your clarifier tank
Another common aeration issue is clogged stones in your clarifier tank. This type of system problem will cause a foul odor outside where your spray heads are running.
Your clarifier tank has stones in the bottom that the air passes through. As the air passes through these stones, microscopic solids are filtered out.
Your air pump may be functioning properly, but if your stones are clogged the air is not able to penetrate upwards through the stones so that it can reach your good bacteria. Without enough air supply, your good bacteria will die and your system will leak odors into the open air.

Extremely dirty systems
A system that is overdue to be pumped is at risk for failure.
Your septic tank collects sludge at the bottom. Most aerobic effluent pumps pull water from an area about 9 inches off of the bottom. If your sludge content is higher than 9 inches, then you are spraying sewage onto your lawn. Yuck!
Effluent pumps are designed to pump water only. When your pump is force fed sludge from an overly dirty system, your pump will wear out very quickly.
Bad house ventilation

Sometimes the cause of foul odors inside your home are not caused by a faulty septic system.
If your septic system checks out, and you are still experiencing “stink,” you are likely experiencing issues due to faulty ventilation inside your home.
Odors are most commonly noticed when we are experiencing high humidity outdoors. We get quite a few calls when humidity is high with the same complaint; “My house smells like a sewer!”
If this is a consistent problem for you (stink inside the house), call Gruene Aerobic Services for a consult. We can help you diagnose the root of the issue so that we can advise what the best solution may be.
Showers and sinks that don’t get used enough
This is an unexpected but common source of foul odor inside your home.

The water that congregates in the pea traps of these sinks and showers turns stagnant from no use, and it becomes smelly.
If this is your problem, the fix is easy! Pour a little bit of household cleaner (make sure it is septic safe!) down the drains. Let it sit for a few minutes and then run the water for a minute or two. This will flush the stagnant water down the drain, taking the foul odor with it.

Take care of your good bacteria
Your bacteria needs food, water, and air to survive. You provide your bacteria with plenty of food and water via your sewage, and your air pump provides your bacteria with oxygen.
The best thing you can do for your good bacteria inside your septic system is to leave them alone!
Septic system bacteria additives are not needed if you have a healthy system. Using these additives will not improve the performance of an already healthy system, and these additives will not fix a system failure.
Your alarm may not always sound when there is a problem
If you smell “sewage” outside or inside your home, call us right away. Your alarm may not always sound then there is a problem that needs immediate attention.
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