Off-Grid Living in Chouteau County, Montana

I've been digging through Chouteau County, Montana's official pages and state agency sites to piece together what off-grid living actually looks like out here, and the short version is: this is a lightly-regulated rural county, but "lightly regulated" doesn't mean "unregulated." Here's what I found.

Zoning and land use. Chouteau County doesn't have a conventional zoning map, but it does administer countywide Development Regulations through its Planning Office, and these apply to the unincorporated county. If you're inside the town limits of Fort Benton, Big Sandy, or Geraldine, those towns run their own separate rules, not the county's. Outside those towns, the county's Development Regulations call for a Development Permit for many land use changes, so I'd contact the Planning Office before assuming raw land is a blank slate.

Dwellings, tiny homes, RVs. The county's regulations include something called a "Summary Permit" process for residential dwelling units, but I didn't find anything specific to tiny homes on wheels or RVs used as permanent residences. Absent a local rule, Montana's state baseline applies (RVs treated as vehicles, IRC Appendix Q as the relevant path for foundation-built tiny homes), so this is inherited from the state, not something Chouteau County has spelled out itself.

Building codes. Montana lets cities and counties opt into enforcing building, electrical, plumbing, and mechanical codes. I could not confirm whether Chouteau County has opted in for single-family homes. The county's Development Regulations mention a Permit Officer and standards enforcement, but that appears tied to land-use permitting rather than a full adopted building code. Ask the Planning Office directly.

Septic and composting toilets. This is handled locally: the Chouteau County Department of Public Health runs an Environmental Health function that covers septic permitting, working under Montana DEQ's statewide minimum standards. I couldn't find a Chouteau-specific fee schedule, but the health department is your contact.

Greywater and rainwater. Neither is separately addressed by the county, as far as I found. Both default to Montana's state baseline, which is fairly permissive for basic in-home greywater reuse and rooftop rainwater collection for personal, non-potable use.

Wells and water rights. Private wells generally fall under Montana DNRC's exempt-well category (up to 10 acre-feet/year, 35 gallons per minute or less) with no county-level well permitting layered on top, though subdivision and COSA review kick in if you're dividing land. Note that starting January 1, 2026, DNRC will require a Notice of Intent before using an exempt well under the permit exception, per DNRC's own materials.

Off-grid utilities. I found no explicit county mandate that a home must connect to grid utilities. The Development Regulations do require new development to address service costs and access as part of permitting, so it's addressed indirectly rather than banned outright.

Bottom line: Chouteau County leaves a lot to state baseline rules, but the Planning Office and Health Department are the two calls to make before you commit to a plan.