PCB is not illegal as regards electric transformers..... there was a time when the regulations of leak prevention, leak detection and cleanup were strictly enforced by the EPA. Also in the regs are the rules of when a replacement is required. Two problems exist today that allow the hazards of leaking transformers:
If it is a federal regulation. it is not enforced. Well not exactly, (paraphrasing a recent article) if you lose some gas/oil from your fishing boat a fine of several hundred dollars may occur. If a company poisons the whole river, the EPA will say, "Shit happens".
In many states, the process of environmental protection has been relegated to the state. Many states, in this group, can not pay their teachers decent wages and benefits or have given their education taxes to phony charter schools. They will not be replacing leaking transformers anytime soon. Then again, the good Senator will find a way to take some of our tax money so the school districts can keep giving money to phony charter schools instead of protecting the children.