Funny you should say that. Our town is in the process of installing septic tanks in every yard right now. All hooked into the system to take away liquid waste, yes, but nonetheless we will henceforth be treating our sewage in our back or front yards. All prompted by EPA regulations, and funded primarily with fedgov grants and loans, of course.
What's ironic is that when they were digging the hole to put in the new tank, they had to first dig up the perfectly good septic tank that was still in the ground, disconnected a couple of decades ago by government edict.
We will move bravely forward to a stone age civilization.