Off-Grid Living in Highland County, Ohio

I'll be straight with you: Highland County, Ohio is one of those places where "county rules" mostly don't exist for land use. Ohio counties generally don't run zoning for unincorporated land, that job falls to the individual townships (17 of them here) under state law (ORC 519), plus Hillsboro and the six villages handle their own zoning inside city/village limits under ORC 713. There's a Highland County Planning Commission, but it's advisory and coordinating, not a single zoning authority for the whole county. So the honest first step on any parcel here is: find out which township it's in, then call that township's zoning inspector.

Zoning and dwellings. Because there's no countywide code, whether you can put a tiny home, RV, or off-grid cabin on raw land depends entirely on the township. I found no county or township source explicitly allowing or banning tiny homes/RVs as full-time residences in unincorporated areas, so that's genuinely unconfirmed, ask the township. Accessory dwelling units aren't clearly authorized in Highland County's township zoning framework as I found it; an accessory structure being used as a second dwelling would likely need a variance or special use approval. Hillsboro city limits are a different story: the city treats manufactured/industrialized homes as single-family dwellings needing a standard permit, with manufactured homes routed through a third-party inspector.

Building permits. Hillsboro has its own state-certified building department (certified in 2014) enforcing the Residential Code of Ohio, with plumbing inspections handled by the Highland County Health Department. For unincorporated townships, I could not confirm which entity issues building permits, so that needs a direct call to the county planning office.

Septic, wells, and water. This part is clear and consistent: the Highland County Health Department is the authority for household sewage systems (permits, soil evaluation by a certified evaluator, inspections) and for private water systems, including wells, ponds, springs, and cisterns. You can install your own septic system, but only after consulting the health department first. Greywater-specific rules and composting toilets aren't separately addressed in what I found, so I'm assuming the state framework applies through the health department, but that's not locally confirmed. Same goes for rainwater harvesting, cisterns fall under the health department's private water system permitting, but there's no distinct county rainwater ordinance.

Utility disconnection. I found nothing county-wide requiring you to hook up to electric or water. The one hard rule: inside the designated Highland County Sewer District, you cannot discharge untreated sewage, but that only applies within that district's boundaries, not the whole county.

Bottom line: Highland County gives you real flexibility on paper because there's no countywide zoning, but that flexibility is really a patchwork of 17 township rulebooks. Don't assume anything until you've called the specific township.