Septic tanks do not last forever. At some point, an old septic tank may need to be decommissioned to pave the way for a newer system.
Old septic tanks cannot just be left to sit because they will pose a threat to the environment and they can also be a hazard that could cause nasty accidents.
As such, it is best to fill any old septic tank. The process may entail removing the tank first but burying it up will also work as long as it is done right.
To ensure that the process is smooth, I will explore the best way to fill in an old septic tank, including the materials to use, how to take care of the old tank and its components, potential risks, regulations to adhere to, and methods that will provide a safe and effective solution.
Burying Vs Removing the Old Tank
Burying the tank or removing it completely are both legit ways of dealing with old septic tanks.
The method you go with will be informed by what you intend to use the site for.
If you are just converting into a lawn or leaving it vacant, burying should be good enough.
However, if you intend to use the site for the construction of a pool, house, or any other structure, then you will need to remove it completely.
Before burying a concrete tank, you may want to crash it first.
Crashing the tank will help ensure the walls do not hold water anymore.
The local authority may also have a say on whether old tanks should be removed or sunk.
You can check with the local authorities to be sure.
Other Parts of the Septic System
When sinking your old septic tank, you should also pay close attention to other parts of the septic system to ensure everything has been removed correctly.
Next to the septic tank, the drain field is the most important part of the system and it also needs to be decommissioned properly.
Start by removing the top layer of soil and then remove the drainage media to fill the voids.
Once filled properly, you should then compact the soil above it to make it sturdy.
If you do not intend to construct over it, plant some vegetation to help prevent surface erosion.
The Best Material to Use
The best material to use for filling in an old septic tank is clean fill.
Clean fill refers to a combination of sand, gravel, and soil.
The clean fill should be free of vegetation or any kind of debris.
Using clean fill to sink old septic tanks will ensure the filled area remains compact and stable.
This will ultimately ensure the site will support heavy machinery, human traffic, or even the construction of structures above it.
Taking Care of Effluents
Before decommissioning an old septic tank, you may want to ensure it is empty.
Dumping the effluent on the ground is not recommended because it will pollute the environment and potentially lead to diseases.
Additionally, dumping untreated waste on the ground violates the law and it could land you in hot soup.
There are two acceptable ways of dealing with effluent in the tank before sinking it.
First, you can have the tank pumped. Alternatively, you can redirect the effluent to the new septic system.
Both of these ways should be done by a septic tank professional to avoid any accidents.
Taking Care of Electrical Components or Devices
A septic system has some electrical components such as alarms and pumps.
When decommissioning an old tank, it is important to also take care of these components.
Before crashing the tank, remove all the electronic components first and dispose of them safely as hazardous materials.
Even if you are sure of how to disconnect these components, it is best to leave the job to a septic tank professional.
That’s because the tank typically has toxic fumes that can be a health hazard.
Potential Risks When Filling the Old Tank
Filling an old septic tank will expose you to several potential risks including damage to any surrounding structures, caving in, and groundwater contamination.
The easiest way to avoid any of these risks is to leave the task to a qualified septic tank professional.
Apart from the expertise in safely decommissioning old systems, the septic tank professional will also advise on any codes and regulations as well as help with the application of required permits.
Regulations to Follow
The regulations that you need to adhere to will depend on your location.
For instance, some jurisdictions may not have a problem with leaving the drain field untouched while others require you to also remove the drain field.
For the avoidance of doubt, it is best to get in touch with your local health department to know the specific regulations that are required in your area.
The Cost of Filling the Old Tank
Learn more about how much it will cost you to fill in the old tank, including on how you can save or cut down the cost here: How Much Does it Cost to Fill in Old Septic Tank?
The Best Way to Fill In an Old Septic Tank: FAQs
1. How long does it take to fill in an old septic tank?
How long it takes to fill up the old septic tank will depend on the size of the tank, the material being used, and the labor (manual or mechanized).
If you are using earth movers and other machinery, the process should be complete in a couple of hours.
2. Are there any government programs or subsidies available to help with the cost of filling in an old septic tank?
It depends on your location. In some regions, the government may issue grants or low-interest loans to help residents to construct, repair or decommission septic systems.
You can contact your local council to find out of such programs exist and if you qualify for the same.
Related: How to Apply For Septic Tank Grant
3. Will filling in an old septic tank affect the resale value of my property?
Filling in an old septic tank will not affect the resale value of your property as long as it is done correctly and per regulations.
In fact, filling it may even increase the resale value of your property, as it eliminates any potential risks to the environment and public health.