Can anyone assist with what a septic system must do to get the distinction of "certified"? My understanding that a cert is needed to do certain things like for certain home loans, or to get permits to add plumbing fixtures. I understand the system needs to be found to be in good working order, but is there anything else? What about location? My septic is a little bit close to the house I think, for current code, but the tank is old so was installed likely before any new code existed. If it is close, does that mean it would fail? Our tank is under concrete right now, so we will eventually need to cut it to access the lid to pump. But everything appears to be functioning fine- no backups or anything, and we are just interested in if it will pass a certification, in the event we need that to add plumbing fixtures inside the house.