Off-Grid Living in Wibaux County, Montana

I'll be straight with you: Wibaux County, Montana is one of the toughest places I've tried to research for off-grid rules, simply because the county doesn't appear to run a public-facing planning, building, or environmental health website. No published zoning ordinance, no septic regulation PDF, no building code adoption notice, nothing I could find officially. So a lot of this brief is going to say "not confirmed" and point you toward a phone call, which I know isn't the satisfying answer you want, but it's the honest one.

Zoning. I could not locate an official Wibaux County zoning map or ordinance. Montana state law lets counties adopt zoning by resolution, and a non-governmental advocacy source mentioned that Wibaux County commissioners may have adopted a countywide resolution related to wind energy, which would be unusual for a rural Montana county (most have no zoning at all). I can't verify that from an official source, so treat it as a rumor to check, not a fact to rely on. The Town of Wibaux, the county's only incorporated town, sets its own separate zoning for in-town parcels, also not something I could pull details on.

Dwellings, tiny homes, RVs. No county-specific rule found. Absent confirmation that Wibaux County has adopted its own building code, the state baseline applies, which generally includes IRC Appendix Q for tiny homes in jurisdictions that require permits.

Building permits. Montana state law exempts single-family homes from state building code permitting unless the county or city opts in. Whether Wibaux County has opted in is not confirmed. This is a must-call question.

Septic and composting toilets. Under Montana law, wastewater systems fall under Department of Environmental Quality (DEQ) minimum standards, specifically DEQ Circular 4 and Administrative Rules of Montana 17.36, with local city-county boards of health typically handling permits and site evaluations. I couldn't confirm whether Wibaux County has its own environmental health office or shares one with a neighboring county, common in sparsely populated eastern Montana.

Greywater and rainwater. No county deviation found for either. State baseline allows limited greywater reuse without a permit under certain conditions, and rooftop rainwater collection for personal non-potable use is generally fine statewide.

Wells. State DNRC "exempt well" rules govern absent local deviation, meaning you'd still file a standard notice of completion after drilling.

Utilities. No statute forces grid connection, and no county rule on off-grid occupancy was found.

Bottom line: this is a call-first county. The lack of an online paper trail doesn't mean no rules exist, it just means you need a live person to confirm them.