SIOUX CENTER, Iowa | A pork processor deemed to be the source of a fish kill in the West Branch Floyd River has hired a contractor to clean up the water, the Iowa Department of Natural Resources said.
The DNR traced the fish kill to Sioux-Preme Packing Co., at 4241 U.S. Highway 75 south of Sioux Center, after a resident noticed murky water and stressed fish in the stream last weekend.
DNR staff found elevated ammonia levels and thousands of dead fish for at least nine miles downstream from the plant, a release from the agency said.
Contaminated water collected behind at least one beaver dam in a tributary to the West Branch Floyd River, said DNR spokeswoman Karen Grimes.
She said the pork processing plant voluntarily hired a contractor to pump the ammonia-laden water out of the pool behind the dam and haul it to a farm field, where the nitrogen can be used.
The DNR is continuing to investigate the reason for the discharge.