Off-Grid Living in Knox County, Tennessee

I've been digging into what off-grid living actually looks like in Knox County, Tennessee, and the short version is: it's doable, but not a free-for-all. Knox County is one of the relatively few rural-ish Tennessee counties with countywide zoning, and it runs its own septic program instead of leaning on the state, which changes the picture compared to counties that have opted out of both.

Zoning is handled by Knoxville-Knox County Planning for unincorporated Knox County. That's a real zoning ordinance with districts and permit requirements, so where you sit on the map matters a lot. If your land is inside Farragut or the City of Knoxville, those municipalities run their own separate zoning, so double-check jurisdiction before assuming county rules apply.

Dwellings, tiny homes, and RVs are a "depends on the zoning district" situation. Knox County has adopted the IRC framework Tennessee uses statewide, but I couldn't confirm specific square-footage or Appendix Q figures at the official level, only from commercial tiny-home sites, which I don't trust for this. Call Codes Administration directly before you buy or build.

Building permits are required countywide through Knox County Codes Administration and Enforcement, and importantly, you cannot get a building permit for a residence without first having a septic (SSDS) permit in hand. That single rule is the biggest practical constraint on off-grid builds here.

Septic is where Knox County stands out: rather than deferring to the state TDEC application system like most counties, the Knox County Health Department runs its own groundwater protection/septic program. Any new system, repair, or alteration needs a permit from KCHD before work starts. Composting toilets aren't addressed specifically in anything I found at the county level, so I'd assume the state NSF 41 baseline applies and confirm any local exception with KCHD directly.

Greywater has no Knox-specific ordinance that I could find. That means you're likely working off Tennessee's general plumbing code baseline (subsurface irrigation, holding tanks, etc.), but I'd call KCHD to confirm before assuming.

Rainwater harvesting looks permitted, following Tennessee's generally permissive statewide approach. No county restriction turned up in my search of Knox County's own sites.

Wells are governed by the state's Water Well Act rather than any distinct Knox County ordinance, so it's a state-baseline situation. Worth noting: much of Knox County is served by utility districts like First Utility District, which reduces how many people are actually drilling private wells here. KCHD does offer well water bacteria testing if you want it.

Living disconnected from utilities: going off-grid on electric is unrestricted, and water via well or rainwater is workable. But wastewater is the sticking point, you can't skip septic permitting even if the property is otherwise fully off-grid, because the building permit itself depends on that septic permit being issued first.

Bottom line: Knox County isn't the most permissive off-grid environment in Tennessee because of active zoning and its own septic program, but it's far from prohibitive if you plan around the septic-before-building-permit sequence and confirm your zoning district first.