The University of Colorado is suing a contractor for "defective toilet paper" that clogged the drains at 20 buildings at its campus in Boulder.

The University of Colorado is suing a contractor, blaming its "defective" toilet paper for clogging the drains at 20 buildings on the Boulder campus and causing more than $40,000 in damage and plumbing repairs.

The university began investigating the issue in May 2009 when it noticed a growing number of toilets were becoming clogged and overflowing into bathrooms.

"In one instance, the University of Colorado was required to saw-cut concrete and excavate sewer pipes in order to remove an auger from a sewer line that was so bound up and clogged with toilet paper that it became stuck in the plumbing line," the university's attorneys wrote in the lawsuit.

The school is now seeking to recover the $40,000 it spent hiring outside plumbing contractors to respond to and repair the damage and other costs associated with the "inconvenience and hassle" of overflowing toilets.