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The short answer

Most households pump every 3 to 5 years. The interval depends on tank size and how many people use the system. A family of five on a 1,000-gallon tank may need pumping every 2 to 3 years, while a couple with a larger tank can often wait longer.

Related: How Often To Pump · what septic work costs · pumping schedule calculator.

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Sources

Where these figures come from

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