Off-Grid Living in Sioux County, North Dakota

Sioux County is an unusual case to research, and I want to be upfront about that before diving in. The Standing Rock Sioux Indian Reservation covers the entire North Dakota portion of the county, which means land-use, building, and environmental authority splits between Sioux County government, the State of North Dakota, and the Standing Rock Sioux Tribe (plus the Bureau of Indian Affairs) depending on whether a given parcel is fee land or tribal trust/allotted land. I could not find a published county zoning ordinance, building code adoption, or septic ordinance on any official Sioux County site, the ND Association of Counties directory, or the usual code hosts like Municode or eCode360. So a lot of what follows is "not confirmed" rather than a clean yes or no, and I think that's more honest than pretending otherwise.

On zoning and raw land, I found no countywide ordinance. If your land is tribal trust or allotted, land-use authority likely runs through the Standing Rock Sioux Tribe and the BIA, not the county. If it's fee land, the county would presumably have some say, but I couldn't locate the actual rule.

Dwellings, tiny homes, and RVs: North Dakota sets no statewide minimum dwelling size, and I found no Sioux County rule on top of that baseline, so this is unconfirmed at the local level.

Building permits are similarly murky. Outside city limits, county permitting in North Dakota is often lighter, but I couldn't confirm who in Sioux County actually issues (or doesn't issue) a building permit, and construction on trust land may go through tribal government instead.

Septic is a good example of why land status matters here. First District Health Unit, which handles septic permitting for several nearby counties, explicitly does not list Sioux County among the counties it covers. So some other health unit or the state Department of Environmental Quality likely has jurisdiction, but I couldn't pin that down from official sources.

Greywater reuse is unresolved both at the state and county level, no statute or ordinance found either way.

Rainwater harvesting appears to be fine by default. No North Dakota statute or Sioux County ordinance restricts collecting rainwater, so I'd call this permitted under the state's general hands-off baseline, though double-check locally.

Wells and water rights are mixed in practice. Many enrolled tribal members in rural districts still rely on well water even as the MR&I Water Distribution System extends water lines to reservation districts. No county-specific well permitting office was found, so the state's general well-construction contractor requirements are the fallback.

Utility disconnection: no ND law forces grid connection, and I found no Sioux County ordinance either way. Montana-Dakota Utilities and Mor-Gran-Sou Electric Cooperative serve parts of the reservation, but living off-grid electrically doesn't appear to be prohibited by anything I could locate.

Bottom line: because of the overlapping tribal, state, and county jurisdiction, your best move is to start with the Sioux County Auditor's office and ask directly who handles permitting for your specific parcel, and separately confirm land status (fee vs. trust) with the Standing Rock Sioux Tribe or the BIA Standing Rock Agency if you're unsure.