Job, family, a million reasons.

I really hope you're not gatekeeping.

No, it just seems like such an arduous process that I would pick somewhere else if it were me. I'm personally likely aiming for Montana.

You'll still need a septic permit in Montana and only certain excavation contractors are certified to install septic systems.

Sure, but the cost of a permit is cheap, and the certified contractors are charging a fair price. I think you are allowed to install yourself if you have certified plans that you work to.