Off-Grid Living in Blaine County, Montana

Blaine County, Montana is big, empty, and lightly regulated compared to a lot of places I research, but "lightly regulated" doesn't mean "unregulated." Here's what I could actually confirm, and where I'm being upfront that I couldn't.

Zoning and raw land. Blaine County has adopted subdivision regulations under the state's Subdivision and Platting Act (Title 76, Chapter 3, MCA), and the county's own subdivision regulations document ties lot creation to Montana DEQ review. What I couldn't confirm from an official county source is whether Blaine County has a separate, countywide zoning resolution controlling where you can simply put a dwelling on raw, unplatted land. Montana law doesn't require counties to zone, so absent confirmation, I'd assume the state default applies and check directly with the county's planning office before you buy or build.

Dwellings, tiny homes, RVs. I found nothing official from Blaine County addressing tiny homes on wheels or RV occupancy. Some third-party aggregator sites claim the county follows the International Residential Code, but I'm not citing that since I can't verify it against an actual county ordinance. Treat this as unconfirmed and call the county directly.

Building permits. Montana exempts single-family homes from state building code review unless a county has opted into that jurisdiction. Whether Blaine County has opted in wasn't confirmed on an official page I could find, though the county's subdivision document does describe an active planning/building function. Ask the county before assuming you're exempt.

Septic and composting toilets. This one's solid: septic systems are permitted and administered locally, tied to state DEQ standards, through the county's Environmental Health Sanitarian (note: this role appears to be contracted/regional rather than a full-time in-house county staffer). Composting toilets specifically weren't addressed on any official county page, so I'd assume the state's general DEQ minimum standards apply and confirm specifics with the sanitarian.

Greywater and rainwater. No Blaine County-specific rules found for either. Both default to Montana's state baseline: greywater reuse inside the home is generally permit-free, subsurface irrigation is more restricted, and basic rooftop rainwater collection for non-potable use is generally allowed.

Wells. Well permitting runs through Montana DNRC's statewide exempt-well and water-rights system. No county-specific added restrictions were confirmed, though the county's environmental health sanitarian gets involved where wells and septic siting interact.

Off-grid utility disconnection. No explicit rule requiring grid hookup was found, but new-lot subdivision review does reference DEQ water/wastewater adequacy standards, which could indirectly push you toward an approved water/wastewater solution even if you're off-grid electrically.

Bottom line: Blaine County gives you real room to build a self-sufficient life, but a lot of the specifics here aren't nailed down in public documents, so a phone call before you commit land or money is worth it.