Champaign officials are trying a new tactic to delay or stop a proposed toxic-waste landfill in DeWitt County.

The city filed a complaint Friday with the Illinois Pollution Control Board claiming that Clinton Landfill never received county approval for a chemical-waste unit.

Landfill operators have applied for a U.S. Environmental Protection Agency permit to bury polychlorinated biphenyls - a now-banned industrial chemical - in part of the landfill.

Nearby municipalities oppose the plan because waste would be above part of an aquifer that provides drinking water to about 750,000 residents.

The county approved a municipal waste landfill in 2002. But Champaign's attorneys say the company should have undergone another local review for a chemical-waste unit.

The landfill's attorney didn't immediately return a message Friday.