Police executed a search warrant on the property after someone called the Department of Human Services, complaining about the living conditions in the house -- and according to their report, "Every room inside the residence had human and dog feces on the floors, walls, and clothing."

The report goes on in horrific detail: "The house was full of flies and in some areas, maggots" -- and police claim they also found evidence of "synthetic marijuana."

The "16 & Pregnant" couple's daughter was taken away by DHS -- and animal control even stepped in ... rescuing three dogs in the house.