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You can't camp within 1 mile of existing facilities, trail heads, and improved campsites. Don't camp within 100 feet of the water. Dig your latrine at least 6 inches and make sure it's not going to contaminate any water nearby. Check ahead to see if you can have a fire. Park your car out of the flow of
I think that's about it. Some places even have already established sites that you can just camp at for free (it's preferable to use those rather than starting a new one). Pic related in Vermont.