If you are selling your house in Washtenaw County then you will be required to have your Septic System Must Pass Inspection to recieve a "Point of Sale Approval" If you want to learn more about Septic Systems then here are some links that you might find interesting Washtenaw County Inspection At the Time of Property Transfer. Onsite Water & Septic Disposal System Shock Clorination & Control of Iron Bacteria All Septic System Website Septic tank Maintenance Suggestions How Sewer & Septic Systems Work