The dumpster crashed through the wall of East Coast Sprinkler Supply on South 2nd Street at 8:30 a.m.
A woman washing her coffee cup in the kitchen narrowly avoided being hit by the careening truck.
"The ceiling was falling in on me, and Ithought it was a plane coming through," Pam Stimatz said.
She said the walls began falling down around her and she began screaming for help.
"A few feet, and I would have been gone," she said. "I was very lucky."
It was not clear why the truck crashed into the building.
The driver was not immediately charged.