Off-Grid Living in Marion County, Tennessee

I've been digging into what off-grid living actually looks like in Marion County, Tennessee, and the short version is: this is one of the more permissive counties I've researched, mostly because there's no countywide zoning, but there are still real strings attached through the state.

Zoning and raw land. Marion County's own government site says plainly there is no zoning in the unincorporated county. That's a big deal if you're buying raw land, since it means the county itself won't dictate what kind of home you put on it. But don't celebrate too fast: some subdivisions carry recorded covenants or HOA restrictions, and those are filed with the Register of Deeds, not tracked through zoning. Always pull the deed history before you assume you have a blank slate. Also note that dividing land into new lots runs through the Regional Planning Commission's subdivision regulations, a separate process from zoning.

Dwellings, tiny homes, RVs. I couldn't find a Marion County ordinance addressing tiny houses on wheels or RV occupancy specifically. That means you should assume the state's default framework applies (Tennessee has adopted the 2018 IRC, with Appendix Q generally allowed for site-built tiny homes, while RVs/THOWs are usually treated as vehicles rather than dwellings). Confirm with the county Building Official before you commit to a plan.

Building permits and code. Marion County does require building permits in the unincorporated county, through its Building & Planning office (Gabe Yeargan is the Building Official). So this is not a "no permit needed" county. The state sets the baseline authority for local code enforcement under Tennessee law, and the exact code edition adopted locally wasn't published anywhere I could confirm, so ask the Building Official directly.

Septic and composting toilets. This is the one place where I'd flag real caution. Septic permits here are handled directly by the state, through TDEC's Division of Water Resources, not a local health department desk. I found a TDEC enforcement action tied to a Marion County property for an unpermitted septic repair, which tells me the state is actively enforcing its Subsurface Sewage Disposal System Law here. Composting toilets have no county-specific rule I could find, so the state's general standard (NSF Standard 41 certification expected) is your safest assumption.

Greywater. No Marion County-specific rule exists that I could locate. State plumbing code baseline generally allows it with limits, but enforcement clarity is thin, so tread carefully and ask before building a greywater system into your plans.

Rainwater and wells. Both look genuinely permitted. No county ordinance restricts rainwater harvesting, and wells fall under the state's Water Well Act with a licensed driller required, no extra county layer found.

Utilities. No mandate to connect to the grid in the unincorporated county. Living electrically off-grid appears unrestricted, but remember the septic and building permit requirements still apply to any habitable structure.

Bottom line: land-use freedom is real here, but the state's septic and building code reach is not something you can skip.