A septic clearance letter is a written document that verifies the current status of a home's septic system, either to be working in a good order or no. In most states in the US, prospective home buyers ask for the septic clearance letter before buying a new house.

Its a certification letter, that says the septic tank has been inspected, and can tell you, if it passed inspection, or if it didnt pass inspection. In otherwords, adequate, or not adequate to use.

Mr. Septic's posts would be fine if he didn't link to his business website every time he posts.