Onsite Wastewater Treatment ← Knowledge Base What is an onsite sewage system or onsite wastewater treatment system (OWTS)? What is the minimum lot size required for an onsite sewage system? I need a soil test report. Who do I contact to do a soil test? Can I, as a homeowner, install my own onsite sewage system? Who is responsible for maintenance of my onsite system? Is it legal for my home's aerator system to discharge to a road ditch? If I buy a home and move it onto a property with an existing system, can I use the existing system? Does the state law require an inspection or evaluation of my onsite sewage system before I sell my home? Where can I find a list of basic and advanced installers? What systems and components are considered basic and advanced? How does a homeowner know what type of onsite system is needed? Do I need a permit to install an onsite system? How much does a construction permit cost? What should I do with sewage tank on my property that is no longer in use?