Off-Grid Living in Union County, South Dakota

I've been digging into Union County, South Dakota, for folks thinking about going off-grid, and the first thing worth flagging is this: unlike a lot of rural South Dakota counties that skip zoning entirely, Union County actually has countywide zoning in the unincorporated areas. That's set by the county under its Revised Zoning Regulations (originally adopted 2008, amended since), authorized by state law under SDCL Chapter 11-2. So if you're picturing "county with no rules," that's not this one, at least outside the towns.

Zoning and land use are governed by the county's zoning ordinance, which divides the county into districts (Agricultural, Rural Residential, Commercial, etc.), and no structure can be built or land used out of step with the district it sits in. If your land is inside Elk Point, North Sioux City, Alcester, Jefferson, or another incorporated town, forget the county rules, that town's own municipal code applies instead, so check locally.

Dwellings, tiny homes, and RVs: I couldn't find explicit language on tiny homes or RVs as permanent dwellings in the excerpts I reviewed. The county's ordinance has a definitions article and has been amended over the years, so this may well be addressed there, but I'd call the Zoning Director directly rather than assume either way.

Building permits are required and issued by Union County Planning & Zoning for unincorporated areas, using a published application form.

Septic systems follow South Dakota's statewide rules under the Administrative Rules of South Dakota, administered through the state DANR program, not a distinct Union County ordinance that I could locate. Neighboring Minnehaha County's public FAQ gives a sense of typical statewide setback rules (distances from wells and surface water), which likely apply here too, but confirm specifics with the state or county before you dig.

Greywater and rainwater harvesting are both genuinely unclear at the Union County level, nothing county-specific turned up. For rainwater, state water-rights rules exempt ordinary domestic use below certain volume/rate thresholds from needing a permit, which would likely cover simple household catchment, but there's no county-specific green light on record.

Wells fall under South Dakota DANR's Water Rights Program statewide, requiring a licensed well driller and adherence to state well construction standards. Rural water hookups are also an option in many parts of the county if you'd rather skip well maintenance.

Living off-utility grid isn't prohibited by the state or county as far as I can find, but any structure you build still has to clear Union County's zoning and building permit hurdles regardless of whether it's tied into the grid.

Bottom line: Union County isn't a blank slate, it has real zoning, so lean on the Planning & Zoning office early.