Off-Grid Living in Lamar County, Mississippi

I've been digging through Lamar County, Mississippi's official records, and the honest headline is: this county is a patchwork. Whether you can do what you want depends heavily on which parcel you're looking at.

Zoning here isn't countywide. Lamar County's Board of Supervisors, acting under state House Bill 1661, adopted zoning only for portions of the unincorporated county starting January 1, 2010. Some areas are shown "white" on the county's Land Use Plan map, and those are exempt from the zoning ordinance entirely. Other parcels fall into zoned districts and require a Development Permit from the Planning Department before you build, demolish, or change land use. Before buying land, I'd call the Planning Department and ask them to confirm which category your specific parcel falls into, because the rules genuinely diverge from one side of a road to another.

Building codes are another twist. Lamar County has no structural building code and doesn't do structural inspections on single-family homes in unincorporated areas. That sounds like total freedom, but it isn't quite. The county adopted a Residential Construction Permitting Ordinance (under state House Bill 1163) effective August 2022, which requires a permit before qualifying construction, generally triggered once remodeling or expansion crosses a set value threshold, and requires each contractor or trade to hold a permit. A separate Flood Permit is required any time a structure needs a utility connection of any kind. Owner-installed solar skips the contractor-licensing requirement, but hired-out solar work needs a Planning Department permit.

Tiny homes and RVs: the ordinance defines an RV as temporary living quarters, which implies it's not meant as a permanent residence, but I didn't find official language spelling out minimum square footage or explicitly banning full-time RV living. Treat commercial-blog claims about "tiny homes under a certain size being allowed" skeptically until Planning confirms it.

Septic, wells, and greywater all run through the Mississippi State Department of Health's statewide On-Site Wastewater program, not a county-specific rule. You'll need a soil/site evaluation and permit before installing a system, and that evaluation is also tied to getting a water meter. Greywater isn't addressed separately by the county, so it falls under the same state wastewater framework by default, meaning it's restricted rather than freely permitted.

Rainwater harvesting doesn't appear to have any Lamar County restriction, and I found nothing in state law that blocks it either, so I'd call it permitted by default.

Off-grid utility independence: there's no explicit ordinance mandating you connect to the grid, but the Flood Permit requirement kicks in for any structure needing a utility hookup, so the county is clearly tracking utility connections even without a full building code. If you're aiming for total disconnection, confirm your plans directly with Planning before you build.

Bottom line: Lamar County gives you more room to maneuver than most places, especially with no structural code outside city limits, but the patchwork zoning and the newer construction permitting ordinance mean you can't assume "no rules." Confirm parcel-by-parcel.