Being as the Federal Government has no authority to regulate anything inside of a sovereign state who cares? The states do a much better job of protecting their own natural resources than the Feds do anyway.
When the epa fulfills its mandates based on the CFR as passed by congress its a usefull tool for the country... if you live in oittsbugh breathing the air proves that... the issue is when the organization goes rougue and passes over regulation without laws or reasonable logic to guide tgem that they get problematic