How Your Septic System Works
In typical on-site treatment systems, all wastewater is co-mingled, treated, and dispersed by one system. There are a few separation systems in which toilet wastes are treated separately from other wastewater.
Common septic systems all have three basic components: plumbing, septic tank, and a soil treatment area. Individual systems may have variations of each of these.
Source: University of MN Onsite Sewage Treatment Program
Source: University of MN Onsite Sewage Treatment Program