Septic Required!!

[Surely Yurts - Steve]

Have you spoken directly to the codes enforcement officer and asked about a composting toilet?

Many codes officers (in places that are used to having seasonal camps) will have a list of acceptable brand names of composting toilets.

If you absolutely cannot get a permit because of HOA's or codes enforcement then a tiny house for the bathroom and a yurt for residence could be an option to consider.