Off-Grid Living in Toole County, Montana

I'll be upfront: Toole County, Montana is one of those places where the honest answer to a lot of off-grid questions is "it depends on which side of a town line you're standing on." The county itself has no countywide zoning ordinance. What it does have is a set of Subdivision Regulations, adopted under the Montana Subdivision and Platting Act, which govern how land gets divided, not what you can do with a parcel you already own. Toole County includes six towns plus Shelby City, and each of those has its own municipal authority, so if your land is inside town limits, you need to call that town, not the county.

On unincorporated county land, there's likely no zoning-based barrier to occupying raw land, but I couldn't confirm that for every area since no county zoning map turned up in my research. Same story with dwellings and tiny homes: no Toole County-specific rule was found, so I'd lean on the Montana state baseline (IRC Appendix Q for foundation tiny homes, RV rules for wheeled ones) until a local official tells you otherwise.

Building permits are similarly murky at the county level. Montana exempts single-family homes from state building-permit jurisdiction unless a local government has opted in, and I didn't find evidence Toole County has its own building department or adopted code. Confirm directly with the county directory.

Septic is more solid ground: the Toole County Environmental Health Department handles wastewater and septic permitting, working within Montana DEQ standards (Circular DEQ-4, ARM Title 17 chapter 36). Composting toilets aren't separately addressed, so expect them to fall under that same review. Greywater reuse is governed by the state rule at ARM 17.36.319, with no added county layer that I found. Rainwater harvesting looks clean, no state or county rule blocks basic rooftop collection for personal use.

Wells run through Montana DNRC's statewide exempt-well process, based on flow and volume thresholds, with a procedural change coming January 1, 2026 requiring a Notice of Intent filing before using an exempt well in some permit-exception cases. New subdivisions also face a DEQ rule requiring connection to a public water/sewer system if one exists within 500 feet, though that's a subdivision-creation rule, not something that applies to an existing off-grid parcel.

Living disconnected from utilities on an already-existing lot appears unregulated at the county level, though I couldn't fully confirm this. Bottom line: Toole County defers heavily to the state and to individual towns, so a phone call before you buy or build is genuinely worth it here.