What is a common septic tank pumping frequency?

The average time period for pumping a septic tank is about one to four years between cleanings. Septic tank pumping frequency depends on the size of the tank, the waste-water volume, and the solids content based on the number of people using the septic system, explains North Carolina State University.

SepticTankInfo.com notes that the type of soil where the septic tank is placed, whether sandy or dry, contributes to the duration of tank pumping frequency, with sandy soil lasting longer between cleanings. SepticTankInfo.com recommends a pumping every four years, while HowStuffWorks recommends a septic tank cleaning every one to three years.