The EPA is a toothless lap dog that protects nothing. That's why you live in the nation's toilet, John.
First let me say that from time to time I deal with NOAA Mussel Watch data as part of my job. Louisiana is a long way from being the most "contaminated" State. A very long way.
Otherwise, the EPA is why the national government can tell people in Baton Rouge, Louisiana, that they must have certain gasoline mixtures to (hopefully) impact ozone levels in Baton Rouge. The Federal government has no legitimate business getting involved in what the ozone levels on Baton Rouge are.
Also, the Federal government has no legitimate business getting involved in whether or not somebody in Ascension Parish fills in some property technically classified as a "wetland" in order to build a house on their own property.
All of this stuff is based on the Commerce Clause. And that's crap. The Constitution gives the Federal government the power to regulate commerce between the States. But Pandora's box was opened when the Supreme Court ruled that gives the Federal government the power to regulate anything that "affects" commerce between the States. It has given rise to essentially unlimited Federal power. There's no way the people that ratified the Constitution construed the Commerce Clause as giving the Federal government the power to do something like say a person can't bring fill material onto their own property to build a structure.
That kind of thing. It's completely out of control and the EPA has way too much power. We'd be better off without it. We really would.