Final answer:
A common term for a subsurface sewage treatment system in Minnesota is a septic tank system.
Step-by-step explanation:
A common term for a subsurface sewage treatment system in Minnesota is a septic tank system. This system consists of a sewer line from the house, a septic tank where sludge settles and microorganisms decompose organic solids, and a drain field where clarified water seeps into the soil and is further purified by bacteria.