Off-Grid Living in Phillips County, Montana

Phillips County, Montana is about as rural as it gets, and honestly, that's reflected in how thin the county's official web presence is. I went looking for a dedicated planning/zoning department page, a building department, a health department site, none of it turned up. What I did find was a Montana Department of Environmental Quality (DEQ) Board of Environmental Review case file involving a Phillips County property, and that document is doing a lot of heavy lifting in this brief. Where I couldn't confirm something at the county level, I'm telling you plainly and falling back to the Montana state baseline.

On zoning: that DEQ case file references the property in question being zoned by Phillips County as "Commercial none restricted," which confirms the county does exercise zoning authority somewhere, under the general power Montana counties have via Title 76 MCA (per the Montana Department of Commerce). But I couldn't find a comprehensive current county zoning map or resolution, so I can't tell you whether your specific parcel is zoned or unzoned rural land. Call the Phillips County Commissioners or Clerk & Recorder to check.

Dwellings, tiny homes, RVs, and building permits are all "not confirmed" at the county level. Montana's statewide baseline is that single-family homes are generally exempt from state building-code jurisdiction unless a county has opted in, and IRC Appendix Q covers tiny homes on foundations statewide. Whether Phillips County has adopted a local building code, I honestly don't know, and neither does an easy search. Ask the Commissioners' office directly.

Septic is the one area with solid confirmation: the same DEQ case file describes a landowner applying for and being granted a septic permit through the Phillips County Sanitarian. So septic permitting is real, local, and administered by that office, consistent with the state's DEQ Circular 4 wastewater standards that county sanitarians apply. Composting toilet rules specifically, though, aren't confirmed.

Greywater reuse and rainwater harvesting have no Phillips County-specific rules I could find, so the state baseline governs: greywater is restricted under state administrative rule, rainwater harvesting is generally permitted.

Wells fall under Montana DNRC's statewide exempt-well framework, and the DEQ case file mentions individual wells as standard parts of septic/water approvals on subdivided rural lots. No separate county well ordinance was found.

Utility disconnection: I found no Phillips County rule mandating grid or utility hookup. As with most of Montana, the real leverage point authorities have is through septic and well permitting tied to subdivision approval, not a direct "must connect" law.

Bottom line: confirm everything beyond septic permitting directly with the county, because the paper trail online is sparse.