Off-Grid Living in Hamilton County, Tennessee

I'll be upfront: Hamilton County, Tennessee surprised me a bit in researching this, because it's not one of those unzoned rural Tennessee counties people often picture for off-grid living. It has countywide zoning, and that changes the calculus.

Zoning. Hamilton County has countywide zoning administered by the Chattanooga-Hamilton County Regional Planning Agency (CHCRPA/RPA). This agency keeps the official zoning map and reviews rezonings, subdivisions, and land uses. Agricultural uses like crops, grazing, and forestry are principal permitted uses in the relevant districts, but this is not a "buy land and do whatever" county. If your parcel sits inside one of the incorporated towns (Chattanooga, Collegedale, Signal Mountain, Soddy-Daisy, Red Bank, Lakesite, Walden, East Ridge), that town's own zoning code applies instead, so confirm which jurisdiction you're actually in.

Dwellings, tiny homes, RVs. I could not find an official Hamilton County page addressing tiny-house-on-wheels status, Appendix Q adoption, or long-term RV living on raw land specifically. Tennessee has adopted building codes with Appendix Q at the state level, but whether Hamilton County enforces that provision is not confirmed, so ask the Building Inspection Department directly before assuming a tiny home qualifies as a permitted dwelling.

Building permits. The county's Building Inspection Department enforces adopted codes countywide (adopted effective 2022, per the county). A permit is required for new construction, additions, alterations, and repairs, with an exception for small storage buildings without plumbing or electrical. Homeowners can self-permit their own residence under limited conditions the county describes, but anyone you hire is treated as a contractor subject to licensing rules. Confirm specifics with the Building Inspection Department.

Septic. This is a "contract county," meaning Hamilton County may require its own local permit layer on top of the statewide TDEC septic system construction permit. The county's website directs applicants to TDEC's Subsurface Sewage Disposal Systems rules and keeps a list of licensed installers, with applications through an online portal. I found no confirmed composting-toilet exemption specific to Hamilton County, so the state baseline (NSF 41 certified units, no automatic exemption from septic rules for habitable structures) is the safest assumption.

Greywater has no confirmed county-specific rule; treat it as unclear and check with Building Inspection or the state framework.

Rainwater harvesting appears permitted, with no county restriction found. The county's construction page covers stormwater and erosion permits for land-disturbing activity, which is a separate matter from a basic rain barrel or cistern setup.

Wells follow the statewide TDEC licensing and construction standards for drillers and casing. I did not find a confirmed separate Hamilton County well permit, but verify directly since some Tennessee counties (like Shelby) do add one.

Off-grid utilities. Going off the electric grid isn't restricted. Sewer is trickier: parts of eastern Hamilton County served by the county's Water and Wastewater Treatment Authority have had capacity issues, and septic permitting near municipal sewer lines can get complicated. I couldn't pin down current moratorium status through official sources, so call WWTA and Building Inspection directly if this affects your parcel.