"The house was packed with people. We found people passed out, incoherent, of all different levels of intoxication ... (some) in need of medical attention," Cle Elum Sgt. Monty Moore told KOMO. "There was vomit everywhere, inside and out."
In the basement, some of those who were sober had tried to help others by putting them on beds, couches or mattresses, said Moore. Some crawled into the bathtub and covered themselves with plywood, others crawled into the attic and hid in insulation, Moore said.
"However, not one person chose to call 911," Ferguson told KOMO.
All 12 students were released from the hospital by Sunday evening.
ABC News' Neal Karlinsky contributed to this report.