Off-Grid Living in Musselshell County, Montana

I've been digging into Musselshell County, Montana for anyone thinking about going off-grid out there, and the honest answer is: a lot of this comes down to a few phone calls before you buy land. Here's what I found.

Zoning. I could not find an adopted, published countywide zoning resolution for unincorporated Musselshell County. There's a Musselshell County Planning Board, which under Montana law would be the body administering zoning if the county has adopted any, but I didn't find zoning maps or regulation text on the county's official site. If your land is inside Roundup city limits, though, municipal zoning applies there instead of county rules. Bottom line: call the Planning Board before assuming raw land is unrestricted.

Dwellings, tiny homes, RVs. No county-specific rule turned up in my research. Absent local adoption of something stricter, the Montana state baseline (which includes IRC Appendix Q for tiny homes and treats RVs as vehicles rather than dwellings) would likely apply, but this is not confirmed for Musselshell County specifically.

Building permits. Not every Montana county requires building permits or charges fees, and I found no evidence Musselshell County has opted into the state building code for single-family homes. That means the state's baseline (single-family homes often exempt from state permit jurisdiction unless a county opts in) may apply here. Confirm directly with the county.

Septic. This one's clearer: Musselshell County has contract sanitarians handling septic permits and subdivision reviews, operating under Montana DEQ's statewide on-site wastewater standards. Call the county's main line and ask to be routed to the sanitarian.

Greywater and rainwater. No county-specific rules found for either. Both likely fall back to Montana's state baseline, greywater reuse indoors without a permit is generally allowed if disposed through a compliant system, while rainwater harvesting for personal non-potable use is generally fine, with bigger appropriations triggering state water-rights review.

Wells and water rights. Musselshell County falls under the DNRC's Lewistown Water Resources Regional Office. An exempt well (10 acre-feet/year or less, 35 gpm or less) lets you skip the full permit process, but you still need either a beneficial use permit or a groundwater certificate. Note: starting January 1, 2026, DNRC will require a Notice of Intent filed before using water from an exempt well under the permit exception, so check your timing if you're planning this.

Utilities. No county rule requiring grid hookup was found. That said, subdivision or health department conditions could indirectly require an approved septic and water source even if grid electric isn't mandated.

My honest take: Musselshell County looks like a place where off-grid living is plausible with fewer bureaucratic hurdles than more populated counties, but the lack of published zoning and building code information cuts both ways, it could mean freedom, or it could mean the rules exist and just aren't online. Call before you commit.