WHERE IS MY SEPTIC TANK FILTER LOCATED AT HOME? SePtic BLUe If you live near a city, you probably don’t need to know where your waste goes since you are connected to a municipal septic line. However, that’s not the case for people in the suburbs or rural areas who rely on a septic tank for their waste management needs. These modern septic systems come with an in-built filter designed to keep most of the micro solids or small particles in the septic tank but release the wastewater. Over time the solid waste, also known as sludge, builds up inside your tank,