How often should I pump out my septic tank?

A conventional septic tank should be pumped every 3 to 5 years, depending on the size of the tank and the household wastewater usage. For example: a family of 6 on a 1000-gallon tank will need to pump out the tank more frequently than a family of 3 on a 1000-gallon tank. In Bexar County, the tank is required to be pumped/cleaned at least every five years in order to renew the License to Operate for the system.