A small-scale sewage treatment system common in areas with no connection to main sewage pipes provided by local governments or private corporations is known as what

Septic tanks, is the right answer.

Explanation:

The term septic is used to refer to the anaerobic bacterial condition that occurs in a tank and is responsible for decomposing or mineralizing the waste dumped into the tank. Such tanks are the underground chamber through which the domestic sewage water flows for its basic treatment. In the septic system, a septic tank is a very important component because it is a small scale sewerage processing system used in the areas where there is no connection to the main sewage pipes.

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