Margaret Thompson was sound asleep Wednesday morning in her Springfield Gardens home when she woke up to a nightmare -- the sound of an explosion and what she thought was rain.

"I looked out the window and saw the street was flooded. Water was just running," Thompson told PIX 11 News. "I looked in my backyard and there was lots of water, then I went ahead and dialed 911."

Thompson and her neighbors received a rude awakening when a 12-inch water main erupted near the intersection of 137th Avenue and 158th Street at 4:50 a.m.

Water came rushing out the broken main and flooded several basements in the area.

Thompson's basement was flooded from floor-to-ceiling with about 8- to 10-feet of muddy water. About a foot of the dirty water even leaked into the first floor of her house, submerging her living room, den and part of the staircase that leads up to the second floor.

"Everything is floating," said Thompson. "I have been here for 42 years [and I have] never seen anything like this."

ConEd and the FDNY shut off her gas and electricity and instructed her to evacuate her home at about 6 a.m.

At least four FDNY engine companies responded to the scene to help pump out the water from devastated homes, including Thomspon's.

"It's just frightening. I am just hoping that there isn't [sewage] mixed up with this water," she said.

A spokesperson for the Department of Environmental Protection told PIX 11 News that the actual cause of the break will not be determined until excavation of the water main is completed.

But Thompson won't soon forget the aftermath of the watery upsurge.

"It seems like a dream," Thompson said. "I can't believe that this is actually happening."