 The problem had not been discovered until thousands of acres of farm land in the state had been contaminated by the hazardous sludge.A criminal investigation to determine the perpetrator of this crime was launched.As of 2015, several bodies of water in the state of Washington were contaminated with PCBs, including the Columbia River, the Duwamish River, Green Lake, Lake Washington, the Okanogan River, Puget Sound, the Spokane River, the Walla Walla River, the Wenatchee River, and the Yakima River.