Water will stay clean, air will stay fresh, fewer industries will be crushed by pointless over-regulation
Your view is very short sighted, and quite frankly, contraindicated by reality.
The EPA and regulations like the Clean Water Act didn't just spring forth from some left-wing conspiracy. They were developed in response to real problems. Maybe people forget blankets of smog over major cities, trash lining major roads, rivers catching fire. The things we're talking about here are not luxuries, are not options. Air to breathe and water to drink are basic necessities.
Sometimes solutions outlive the problems they are intended to address and should be removed, but there's no reason to expect that to be true here. We continue to see people make short-sided decisions. I'd say "over-regulation" is a statement of opinion, I'm not going to argue your opinion, but "pointless" is a statement of fact, and you have your facts wrong.
As an analogy, it's easy to think vaccines are unnecessary or not worth their risk because, hey, when's the last time you saw someone with polio or small pox? But it's precisely that vaccines are so effective that you don't see those things.
So sure, we have for the most part air we can breath and water we can drink, but it's because of the EPA. And when the EPA goes away, so will those things.