Septic Pumping Services by Summerland Environmental The septic system uses waste-borne bacteria as part of its biological treatment process. Septic systems eventually need to be pumped out because of the buildup of solids, even under ideal conditions. Pump out intervals vary depending on a variety of factors, but it is advised that they be cleared every 4-6 years. Visit Us :- https://summerlandenvironmental.com.au/services/septic-systems