Off-Grid Living in Sullivan County, Tennessee

I've been digging into Sullivan County, Tennessee for folks thinking about going off-grid there, and the first thing I want to flag is that this county is NOT one of those rural Tennessee counties that opts out of zoning. Sullivan County has adopted a formal Zoning Resolution under state authority (Tennessee Code 13-7-101 through 13-7-116), and it runs a Regional Planning Commission plus a Board of Zoning Appeals that meet monthly. That means raw-land occupancy here is more constrained than the "wild west" reputation some TN counties have. I couldn't find specifics in the official sources on informal or temporary camping/occupancy by district, so if that's your plan, call Planning and Codes and ask about your specific parcel's zoning district.

On dwellings, the county enforces the 2018 International Residential Code and 2018 Energy Code (same edition as the state baseline, which includes Appendix Q tiny-home provisions). The county's own language is blunt: building permits are required for basically every kind of residential structure, from stick-built homes to single-wide and double-wide mobile homes to modular homes, additions, carports, garages, sheds, decks, and interior remodels. I did not find confirmation of how the county treats tiny-houses-on-wheels or RVs used as permanent residences, so that's a "call and ask" item, not a "guess and hope" item.

Septic is where jurisdiction gets layered. TDEC (Tennessee Department of Environment and Conservation) sets the statewide rules for onsite sewage disposal systems, and Sullivan County administers permitting within that framework. I could not locate a county-specific environmental health office page, so your best move is to start with TDEC's portal or call County Planning and Codes, since they note septic, stormwater, floodplain, and driveway permits are all separate tracks from your building permit.

Greywater reuse has no Sullivan County-specific guidance that I found, so it falls back to the state's general plumbing code framework, which technically allows it under certain holding-tank and filtration conditions but is loosely enforced. Rainwater harvesting looks genuinely fine, no state or county restriction turned up in my research. Private wells are permitted and governed by TDEC's Water Wells Act, requiring a state-licensed driller, and no county-specific well ordinance surfaced, though a lot of the county is on municipal or utility-district water (Bristol Water and several utility districts serve tens of thousands of residents).

Utility disconnection is a genuine "it depends" here. I found no countywide mandate forcing you to connect to water or sewer, but rules could differ once you're inside Bristol or Kingsport city limits, or inside a utility district's service area. That's a municipal or utility-district question, not a county one.

Bottom line: Sullivan County is more regulated than a lot of rural Tennessee, so lean on Planning and Codes early and often.