Off-Grid Living in Gibson County, Tennessee

I'll level with you upfront: Gibson County, Tennessee doesn't have much of an official paper trail online when it comes to off-grid rules. There's a real county Building Inspector's office and a county Health Department, but I couldn't find an official countywide zoning ordinance, septic ordinance, or greywater/rainwater/well policy published by the county itself. So a lot of what follows is "here's the Tennessee state baseline that would apply absent a specific county rule," clearly flagged as such.

Zoning. I could not confirm that unincorporated Gibson County has adopted a countywide zoning resolution. That's not unusual, plenty of rural West Tennessee counties don't zone unincorporated land at all. What I can confirm is that the incorporated Town of Gibson, a separate municipality inside the county, has its own zoning title in its municipal code. So if your land is inside town limits, town zoning applies; outside town limits, it's genuinely unclear whether any zoning applies. Any zoning that does exist in Tennessee traces its authority back to the state enabling statute, T.C.A. §13-7-201, which lets a county or town regulate lot coverage, setbacks, density, and use.

Dwellings, tiny homes, RVs. No Gibson County-specific rule found. Tennessee has adopted the 2018 IRC and 2018 IECC statewide, and enforcement is either local or handled by the State Fire Marshal's Office where a county hasn't opted in locally. Whether Gibson County enforces its own residential code or defers to the state program isn't confirmed, so ask the Building Inspector directly.

Building permits. Confirmed: Gibson County has an active Building Inspector's office. What's not confirmed is which code edition they enforce or whether the county has opted out of the state program by legislative vote, as some TN counties do. Call and ask.

Septic. This one's restricted regardless of confirmation gaps, because septic systems in Tennessee are governed by state statute (T.C.A. Title 68, Chapter 221, Part 4), administered through TDEC's On-Site Sewage Program, typically processed through the county health department. Gibson County has a Health Department listed, which is likely your local contact, but I couldn't confirm current forms or whether it's a contract county versus a TDEC-direct county. No composting-toilet or dry-cabin exemption was found, so assume the state's NSF Standard 41 requirement applies.

Greywater, rainwater, wells. No county-specific rules found for any of these three. They default to the Tennessee state baseline: greywater reuse is technically allowed under state plumbing code with storage/filtration limits, rainwater harvesting is unrestricted, and wells require a state-licensed well driller.

Utilities. No county mandate to connect to grid water/sewer was found. Some of that regulation might exist inside Town of Gibson's own utility code if you're in town limits, but out in the county it appears unregulated.

Bottom line: start with the Gibson County Building Inspector and Health Department for anything concrete, and don't assume "no ordinance found" means "no rule exists," it may just mean nobody's put it online.