MADISON, Wis. -- The holiday break at Chavez Elementary School will be longer than anticipated.

The district announced results of mold testing at the school Wednesday, and the news was not positive, News 3 reported.

Rooms in the kindergarten and fourth-grade areas that had been cleaned out are still infested with active sources of mold, officials said.

That means the planned return date of Jan. 7 for students is being pushed back.

District Superintendent Art Rainwater said that each day the school remains closed adds to the overall bill.

"The longer they're there working, the more we have to take out and the more we have to build, then, obviously, the more expensive that is," Rainwater said. "We just don't know the extent of that at this time. The longer we're out, the more transportation costs there are."

Rainwater commended staff, students and parents for being so cooperative in a trying situation.

Westra, the contractor, is working with the district on the reconstruction, but the district continues to investigate liability issues and will decide down the road who is responsible and how costs will be paid.