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Regarding this, when were metal septic tanks used?
Around 1940, a practical standard for septic tanks became popular in most areas, and precast metal tanks were developed soon after. These original steel tanks, which were referred to as dickey tanks by a lot of homeowners, were like 500-gallon steel drums that came with a lid or cover.
Similarly, you may ask, how long do steel septic tanks last?
Typically, a steel septic tank will last between 15 and 20 years. Tanks made of concrete or plastic are usually preferable in terms of longevity. A properly maintained septic system with a concrete tank can last well over 40 years.
The septic tank is a watertight box, usually made of concrete or fiberglass, with an inlet and outlet pipe. Wastewater flows from the home to the septic tank through the sewer pipe. The septic tank treats the wastewater naturally by holding it in the tank long enough for solids and liquids to separate.