Locals: check your county or town laws page and tell me what I got wrong
Every US state, 3,000+ counties, and the New England towns have a researched off-grid rules page here (/off-grid-laws). The research comes from primary sources, but nobody knows a county like someone who has pulled a permit in it. If you live in one of these places, please open your page and use the correction form on it, or reply here. Verified local corrections get credited on the page.
