"It's a great step, but it's a first step," he adds — meaning much more needs to be done to reduce the presence of TCE and perc in the environment. "There's a lot of TCE [and perc] already in ...

The chemical in question is perchloroethylene, commonly referred to as PCE or Perc. It causes liver, brain, kidney and testicular cancer, the Environmental Protection Agency says, and can damage ...