Off-Grid Living in Mercer County, West Virginia

I'll be upfront: researching Mercer County, West Virginia is trickier than usual because there are Mercer Counties in Pennsylvania, Ohio, and Kentucky too, and a lot of search results get cross-contaminated. What follows is built only from sources I could confirm belong to Mercer County, WV, plus the City of Princeton, which sits inside the county and runs its own building and code enforcement department.

Zoning. I could not find an official Mercer County Commission page describing a countywide zoning ordinance. West Virginia's state baseline is that zoning is optional and adopted locally, so it's entirely plausible the unincorporated county has none. The City of Princeton does have its own zoning/code enforcement function, so if your land is inside city limits, different rules apply than if it's out in the unincorporated county. Confirm with the Mercer County Commission directly.

Dwellings, tiny homes, RVs. Not confirmed anywhere in county or city sources I found. If you're planning to live in something unconventional, call the county or, if applicable, Princeton's building department before you buy land or move a structure in.

Building permits. The county has adopted a floodplain ordinance: I found language stating it's unlawful to get a utility connection approved, or to occupy a building in a flood hazard area, without a compliance certificate from the county's Local Floodplain Administrator. Outside mapped flood zones, I did not confirm a general countywide building permit requirement. Inside Princeton, the Code Enforcement/Building Inspections department handles permits and inspections for construction.

Septic and wells. The Mercer County Health Department's Environmental Health division issues septic permits and handles well-related guidance, operating under West Virginia's statewide sanitation and well-certification rules. This is the office to call for either. Composting toilets aren't addressed on their public pages, so don't assume one satisfies the septic requirement without asking first.

Greywater. No separate county policy found. It appears to fall under the same sewage permitting the health department oversees, alongside the state Bureau for Public Health, rather than having its own set of rules.

Rainwater harvesting. I found no county ordinance touching this at all, which generally means it's unregulated for non-potable use, consistent with the state's general hands-off posture.

Utility disconnection. No ordinance requiring hookup to public utilities was found. The floodplain ordinance only ties utility connection approval to floodplain compliance certificates within flood hazard areas, not a blanket mandate to connect. Outside those areas, staying off-grid seems to be mainly a matter of getting your septic and well squared away with the health department.

Bottom line: Mercer County's official web presence is thin on zoning and dwelling specifics, so plan on a phone call to the County Commission and the Health Department before committing to a property, especially if you're near Princeton or in a mapped flood zone.