Off-Grid Living in Lexington County, South Carolina

If you're picturing off-grid life in Lexington County, South Carolina, the first thing I have to flag is jurisdiction. Lexington County runs countywide zoning, but only in the unincorporated areas. The moment your parcel sits inside the Town of Lexington, Cayce, West Columbia, Irmo, Chapin, Batesburg-Leesville, Gilbert, Pelion, Swansea, or any of the other incorporated towns, you're dealing with that town's own planning and building office, not the county. Everything below is my read of the unincorporated county rules, sourced from Lexington County Community Development and the state.

Zoning: The county's zoning ordinance, administered by the Zoning Office under Community Development, dates back to 1976 and has been amended many times. Whether raw land can simply be occupied depends on the zoning district your parcel falls in, so I'd call Zoning before assuming anything.

Dwellings, tiny homes, RVs: This is one area where Lexington County has gone further than most South Carolina counties, it passed a specific tiny-home ordinance (Ordinance 23-13) that regulates tiny homes as their own land use category, whether site-built, modular, manufactured, or park-model. Manufactured and mobile homes need a Zoning approval as step one of a Mobile Home Approval Checklist, before any building permit, utility connection, or decal is issued. The county also caps density, generally no more than two mobile homes per property or nearby parcels under common ownership. I could not confirm that living full-time in a standalone RV outside a licensed park is broadly allowed, so check with Zoning directly.

Building permits: Community Development issues residential and commercial permits under the statewide code set by the SC Building Codes Council. Manufactured home setups have their own inspection sequence before the power company will connect service.

Septic: Septic permitting is a state function now, run by the South Carolina Department of Environmental Services (SCDES) since the 2024 split of the old DHEC. You need SCDES septic approval before the county will issue a building permit. Composting toilets aren't addressed anywhere I found at county or state level, so treat that as unconfirmed and ask SCDES or county Building directly.

Greywater and rainwater: I found no Lexington County ordinance on either topic. Both default to whatever the state SCDES baseline requires, and rainwater harvesting in particular is genuinely unclear, so confirm before you build a system tied to household use.

Wells: Lexington County is one of the busiest counties in the state for well permits, and importantly it sits inside South Carolina's Western Capacity Use Area, a state designation covering several Midlands counties that can add groundwater monitoring or reporting obligations beyond a standard SCDES well-construction permit.

Off-grid utilities generally: Nothing I found bans living without grid power, so long as you clear septic/well approval and zoning sign-off first. Those approvals are the real gatekeepers here, not any anti-off-grid rule.