Off-Grid Living in Cannon County, Tennessee

I've been digging through Cannon County, Tennessee's official zoning and building documents to figure out what off-grid living actually looks like there, and it's a bit of a mixed bag: this is not one of those "wide open, no rules" rural Tennessee counties.

Zoning. Cannon County, unlike a lot of rural Tennessee counties, has adopted countywide zoning under the authority granted by state law (Tenn. Code Ann. § 13-7-101 et seq.). The Cannon County Regional Planning Commission administers the zoning map, and a Board of Zoning Appeals handles variances. So before you buy raw land here assuming you can do whatever you want, check which zoning district it sits in.

Dwellings, tiny homes, RVs. This is where I'd slow down. The zoning resolution's definition of "dwelling" specifically excludes tents, RVs, and similar structures, which means an RV isn't treated as a permitted residence by right. RVs get their own separate definition and rules. Manufactured and mobile homes are their own use category, with different districts (like R-1 versus A-1) treating them differently. I could not confirm whether Cannon County has formally adopted IRC Appendix Q, which is the code path a lot of tiny-house builders rely on, so if that's your plan, call the Planning Department directly.

Building permits. Here's a real change worth knowing: as of October 16, 2023, the Cannon County Planning Department took over building code administration and enforcement itself, replacing the Tennessee State Fire Marshal's Office, which used to handle it statewide. So permits are now a local matter, issued by the county. There are fees involved (an Adequate Facilities Privilege Tax and a Zoning Compliance Fee are mentioned in county materials), but I don't have confirmed dollar amounts, so ask the Planning Department directly.

Septic and composting toilets. Septic permitting in Tennessee is a state function under TDEC, governed by Tenn. Code Ann. Title 68, Chapter 221. I did not find a dedicated Cannon County environmental health webpage, so it looks like TDEC handles septic permit applications directly rather than the county. Composting toilets generally follow the state's NSF-41 standard baseline; I found no county-specific exemption.

Greywater, rainwater, wells, utility disconnection. For all four of these, I found no Cannon County-specific ordinance. That means they inherit the Tennessee state baseline: rainwater harvesting is unrestricted, greywater reuse is technically allowed under the state plumbing framework (though enforcement is inconsistent), wells fall under the Tennessee Water Well Act and require a licensed driller, and there's no county rule forcing utility hookups. None of this is confirmed as county-administered, so if you want certainty, ask.

Bottom line: Cannon County is more regulated than the "no zoning at all" reputation some rural TN counties have, and the 2023 shift to local building code enforcement is a meaningful change worth confirming directly with the county before you plan a build.