It's unfortunate that the EPA is under attack by conservatives who want limited government. If you start from first principles about what the min viable government should do, a big part of its charter would be to prevent major tragedies of the commons. And the environment is a textbook example of something that'd suffer the tragedy of the commons without government oversight. I prefer a bigger government with a bigge…
On the other hand, does the EPA really require 8 billion dollars per year when the protection laws have already been passed and improvements have already been made? In a software project, you allocate $x per month during development, and only $(x/10) for maintenance after it has shipped. Is there a point where the EPA can say "mission accomplished" and downsize to maintenance/enforcement mode, or is this just a typic…
In a libertarian system, you’d simply ban pollution (I.e. ban the externalizations of environmental costs), and then let the market and the courts hash things out. If a company was found dumping pollutants into the water, people would sue them, and the costs of all of that would get properly priced into the company’s products.
But the environmental laws are all about the various ways in which companies are allowed to pollute. Companies can dump poison into rivers, so long as they conform the EPA limits. Those limits are, by design, not set any “correct” level (as above, the “correct” level is zero—forcing the externality to be fully internalized; from an economic efficiency point of view, all environmental externalities must be borne by parties to the transaction, either the company or its customers). Instead, the limits are of a “best effort” nature, and a “how to get there from here” nature. For example, the law requires air polluters to install “the best available control technology” on smoke stacks. What does that mean? Well, that requires continual review and revision.
The EPA doesn’t exist to enforce laws that prevent pollution. It exists to manage all the pollution that the law allows.