Off-Grid Living in Calhoun County, South Carolina

I'll be upfront: Calhoun County is one of the South Carolina counties that actually has countywide zoning, which surprises people who assume rural SC counties are a free-for-all. That changes the calculus for off-grid plans here compared to counties with no zoning at all.

Zoning. Calhoun County adopted its own Zoning and Development Code under the state's Local Government Comprehensive Planning Enabling Act. That means every parcel in the unincorporated county sits in a zoning district (rural/agricultural, the Urban District around St. Matthews and Cameron, etc.), and what you can build or occupy depends on that district. If your land is inside the Town of St. Matthews or Cameron, you're also layered with town permitting on top of the county's, though I couldn't confirm town-level specifics from official sources.

Dwellings, tiny homes, RVs. The county has a specific Manufactured Home Ordinance covering siting and foundations, but I could not find county rules addressing RVs, park models, or tiny houses on wheels as permanent residences. State practice generally treats RVs as non-permanent dwellings under the building code, so don't assume you can just live in one long-term without checking with Building & Planning first.

Building permits. The Calhoun County Building and Planning Office runs the permit process, and the county's own guide lays it out plainly: you bring a recorded plat, staff checks drainage/easements/setbacks, then you apply to the state environmental agency for a soil evaluation before your permit gets issued. Inspections (temporary power, foundation, plumbing) follow during construction.

Septic. This is state-controlled: as of mid-2024, septic/onsite wastewater permitting authority moved from DHEC to the new South Carolina Department of Environmental Services (SCDES). The county's own permit packet requires a Wastewater Disposal System Verification, so no dwelling gets a certificate of occupancy without an approved system. I found no county allowance specific to composting toilets, so I'd treat them as falling under the same state wastewater framework.

Greywater and rainwater. No Calhoun County-specific rules turned up for either. Both default to the state baseline (SCDES engineered-system rules for greywater), and for rainwater catchment tied to household plumbing, I'd call Building & Planning directly since nothing local addresses it.

Wells. No county-added layer here either, just the state's SCDES well permitting program.

Utilities. There's no ordinance forcing a grid-electric hookup. But occupancy still runs through the county's certificate-of-occupancy process, which requires proof of an approved wastewater system regardless of whether you're on the grid. So "off-grid" electrically is fine, but you're not skipping the septic/zoning/permit gauntlet.

Bottom line: Calhoun County's zoning and building-permit process is real and active, and septic approval funnels through the new state agency, SCDES. Confirm the details for your specific parcel and district with the county before you buy or build.