On average, septic tanks should be pumped out every 2-3 years. However, this number varies based on the number of occupants a home has, the volume of water being used every day, and the size of the system.
It must be said that there are many myths circulating regarding septic system maintenance. Some folks believe that septic tanks don’t need to be pumped out. Others think that pumping them out more than once a decade is detrimental to the bacteria that are naturally present in a septic tank. Others are of the mindset that it needs to be done every year no matter what.
When it comes down to it, just remember that each household has different water usage habits and each system is made to handle a certain amount of waste and water. Your best bet is to learn about your system, make note of your household’s water and waste habits, and then get on a regular maintenance schedule based on that information- whether that means getting your tank pumped every two years or every five years.