Most people think of a septic tank like they would a glass of water, once the water reaches the top it’s “full”. The main factors determining the frequency of pumping include the size of the household, total wastewater generated, amount. Septic Tank Inspections What to Expect of a Good Septic Shares how often you should pump your tank and what happens if you don’t. How often should a small septic tank be pumped . If the house has up to 5 inhabitants, it should be pumped every 2 years. If your township doesn't send you a reminder every few years, it can be hard to keep track of how often your tank should be emptied. Does your home or commercial facility have a garbage disposal? How often should you pump out your septic tank? Septic tank pumping frequency guide. How often should a septic tank be pumped out? This document explains a key point in how septic systems work: Regardless, it is more than worth it to keep your business running smoothly. The table below g...