Septic tanks are designed to separate all wastewater that leaves a household. There are three layers the wastewater is separated into after sitting in the tank for a minimum of forty eight hours. All solids should sink to the bottom of the tank, known as the sludge layer. Fats, grease, and oils should float to the top of the tank, known as the scum layer. In between the top scum layer and the bottom sludge layer is the separated wastewater, which is known as the clear or effluent layer. After the separation process takes place, the effluent is able to leave the septic tank and make its way to the leach field where it will be broken down further.
Septic Tank Replacement
Septic Tank Needs Replacing... How Can This Be?
It is crucial that the structural integrity of a septic tank remains in tact, so that it is able to house the wastewater as well as help the separated effluent continue its journey to the leach field. Once a tank loses its integrity it becomes a safety hazard and will need to be replaced by a septic professional.
A concrete septic tank is able to form cracks and can corrode over time. Although septic tanks are often made of concrete, they are not considered load bearing. Septic tanks are constructed to support the weight of the dirt backfilled over them, however, they are not designed to support the weight of vehicles or equipment driving on top of them. The extra weight can easily crack a tank. Concrete septic tanks can also corrode over time which is caused by the gases that are present inside a septic tank. Regardless of how the tank has been cracked or corroded, the tank will eventually have to be replaced if it is not functioning properly, and or poses a collapse hazard.
Not all septic tanks are made out of concrete. Septic tanks are also made of fiberglass and polyethylene, which are just as susceptible to damage. These materials do not corrode like concrete, however, they collapse more easily. The fiberglass and polyethylene tanks are also designed to withstand only the weight of the dirt backfilled on top of them. Just like the concrete tanks however, there should be no vehicles or equipment driving over the tanks, as they are not designed to hold that much weight. Once a fiberglass or polyethylene tank starts collapsing, they are a hazard and need to be replaced.
If a homeowner is unsure about the condition of their septic tank, it is advised to have a septic professional perform an inspection to confirm the condition and safety of the tank. If a tank shows evidence of cracking or corrosion it is vital to have the tank replaced.
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