HATTON, Mo. (AP) — A Callaway County hog farm whose owners are seeking a state permit to significantly expand operations has reported a 10,000-gallon waste spill to state regulators.

The Columbia Daily Tribune (bit.ly/12dgVon ) reports the waste came from the Pork Master Inc. hog feeding facility and wound up in a tributary of Millers Creek in the Mark Twain National Forest. An owner of nearby property in central Missouri discovered the spill Monday.

Missouri Department of Natural Resources spokeswoman Gina Terlizzi says the spill could potentially violate the farm’s no-discharge permit, pending a state investigation.

The owners of Pork Master Inc. are seeking state approval for an adjacent breeding facility in western Callaway County that could house 10,000 pigs. More than 1,200 residents signed a petition opposing the plan.