As other commenters have mentioned, it's a state-level thing, but in reality most (all?) states handle permitting and enforcement at the city and county level.

As other commenters have mentioned, it's a state-level thing, but in reality most (all?) states handle permitting and enforcement at the city and county level. In many rural counties you could get away with this without a problem. Is it technically against the law? Sure. But county officials may not notice, care, or have the resources to enforce the rules depending on where you are. Many rural areas operate under a live-and-let-live approach when it comes to individual property, as long as you don't cross anyone with political pull or make a gigantic obvious mess.