Off-Grid Living in Pennington County, South Dakota

If you're eyeing unincorporated Pennington County, South Dakota for an off-grid setup, the first thing to understand is that this county is not one of the "no-code, no-zoning" rural counties you sometimes hear about in South Dakota. Pennington County has adopted a countywide Zoning Ordinance and a 2020 Comprehensive Plan (updated in 2025), and its Planning Department handles zoning, building permits, and septic together. So expect more oversight here than in a county with no zoning at all.

Zoning determines what you can do with raw land, whether that's parking a camper long-term, building a cabin, or running an off-grid homestead. The Zoning Ordinance sets districts, setbacks, and permitted uses, and the Board of Adjustment can grant variances on things like lot size or setback if you have a good case. This is a Pennington County rule, adopted under state authority (SDCL Chapter 11-2), not a state mandate itself.

On dwellings, the ordinance explicitly lists categories like Accessory Dwelling Units, Efficiency Dwellings, Temporary Living Quarters, Caretaker's Residences, and Recreational Vehicle Parks as conditional uses, meaning the county actively regulates rather than bans these. What's genuinely unclear from the ordinance text I reviewed is whether a tiny house on wheels can be a standalone, permanent residence outside a formal RV park. My best guess is it would be treated similarly to an RV (subject to state RV registration through the SD Department of Revenue), but I couldn't confirm that occupancy rule in county text, so call Planning before you commit.

Building permits are required for essentially any construction in the county, and Pennington County has adopted International codes (Building, Electrical, Fuel Gas, Fire), with electrical and gas code administration actually handled by the State of South Dakota even though the county requires the permit.

Septic is where the county adds real teeth beyond the state minimum. South Dakota's ARSD Chapter 74:53:01 sets the statewide floor, but Pennington County layers on its own Operating License system, requiring periodic re-inspection and license renewal, plus a license check before any property sale. Holding tanks are allowed only as a last resort. Composting toilets aren't addressed separately in what I found, so that's a direct question for Planning.

Greywater reuse and rainwater harvesting are both unaddressed in official Pennington County sources I reviewed, and inherit whatever ambiguity exists at the state level. Wells look to be governed by the statewide DANR program with no confirmed county add-on. And there's no blanket ban on living off-grid from utilities, but any structure you build still needs a permit and code compliance, and any wastewater system still needs that county license.

Bottom line: Pennington County is workable for off-grid living, but it's a "call first" county, not a "just go build it" county.