Kitty litter and feces covered the floor in one room, just feet from the teenager's bed according to investigators.
They found similar debris in the attic and much of the house.
Neighbors, who asked not to be identified, said they have been complaining for years to both police and animal control.
An animal control officer had been at the house in recent weeks but stayed only a few minutes and reported no problems.
Police expect the adults to be charged with endangering the 15-year-old living in the house.
They also expect to file charges in connection with the computer crimes that initially led them there.
All of the adults are now staying elsewhere.
The 15-year-old is with his biological father.
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