Off-Grid Living in Hamilton County, Ohio

Hamilton County, Ohio is a strange one to research because there's no single answer to "what are the off-grid rules here." That's because Hamilton County does not have countywide zoning. The Hamilton County Rural Zoning Commission only administers zoning in a handful of townships (and parts of townships), plus some contract jurisdictions. Cincinnati, the City of Hamilton, and other incorporated municipalities run their own separate zoning and building departments entirely. So the very first thing I'd tell anyone looking at a parcel here is: find out which of these three regimes governs that specific piece of land before you assume anything below applies.

For the unincorporated townships under county jurisdiction, the county's Rural Zoning Commission handles zone amendments and PUD decisions, and a Zoning Certificate from the local zoning authority is required before you can even apply for a building permit. I didn't find a specific county ordinance addressing tiny homes or RVs as permanent dwellings; that would live in the full Zoning Resolution text for the specific township, so I'd call the zoning inspector directly rather than guess.

Building permits in unincorporated townships and six contract jurisdictions go through the county's Division of Buildings + Inspections, tracked on their EZ-Trak system. Electrical permits are handled separately, by a private inspection agency under contract, not the county building department itself. The county has said it's working on adopting its own building code, which tells me it currently leans on the state Residential Code of Ohio in the meantime.

Septic is where Hamilton County gets more hands-on than the state minimum. Hamilton County Public Health issues septic (HSTS) permits and does its own inspections, more frequently than state law requires in some cases. A new dwelling can't legally be occupied until the health district signs off on the sewage system. And here's a real off-grid-relevant catch: if you're within a certain distance of an existing sewer line, county policy (backed by state law) can require you to connect to it even if your septic system works fine. Greywater is allowed but has to run through an approved system, informal discharge is treated as a violation. Rainwater harvesting and private wells are both permitted, with wells requiring a permit from Hamilton County Public Health, except if you're in Cincinnati, Norwood, or Springdale, which use their own municipal process instead.

There's no outright ban on disconnecting from electric or public water utilities that I found, but occupancy approval is tied to septic and water sign-off, so full off-grid living isn't as simple as just going without hookups.