Closing on my 1st house soon and I want to find out the condition of the tank.. unfortunately the seller is just flipping the house so he doesn't know.. generally how far and how deep are septic tanks.. I see a very big cast iron pipe in the basement leading out.are the tanks always in a straight line from that pipe?. no one had lived in this house for 2yrs prior to me buying.. should I ask the seller for a reduced price if I can not check on the tank or is that wrong?. also what would be the estimated cost of installing a septic system fresh?my brother in law INSISTS I get a "perk test"... I thought those were needed if I didn't have a tank already?. thanks again for all your advice... being its my 1st house I know I will have plenty more to ask.. TommyP:)