Final answer:
The form published by TAR used by the seller to provide additional information about the septic system or on-site sewer facility is the Seller's Disclosure of Property Condition Addendum.
Step-by-step explanation:
The form published by TAR that is used by the seller to deliver additional information to the buyer about the septic system or other on-site sewer facility is called the Seller's Disclosure of Property Condition Addendum.