Off-Grid Living in Montgomery County, Missouri

Montgomery County, Missouri sits in that gray zone a lot of off-grid-curious folks run into: it's rural enough that you'd expect minimal oversight, but the county government does run an active permitting system even though I can't confirm it's a classic voter-approved Chapter 64 zoning code. I'm laying out what I found from official sources, and flagging plainly where I couldn't nail things down.

Zoning and land use. The county's Planning & Zoning office handles building permits, setbacks, and mobile-home rules countywide. Setbacks differ by area (RES zones vs. the Rural Villages like Danville, Mineola, and Big Spring), so check with that office before siting anything. Whether Montgomery County ever passed the statutory zoning-enabling vote that would make this "true" zoning is not confirmed from what I found, but functionally, you're dealing with a permit-driven system either way.

Dwellings, tiny homes, RVs. The one clear rule: a mobile home manufactured more than 10 years before your application date will not be permitted, and you'll need to show a title or manufacturer ID proving the manufacture year. I found nothing county-specific on tiny homes or RV-as-residence, so treat that as unconfirmed and ask Planning & Zoning directly.

Building permits. Most structures need a county permit, but agricultural buildings (a Schedule F tax form helps prove ag status), fences, decks, pools, gazebos, picnic shelters, and open porches are exempted. Homes and most other structures need permits.

Septic. This is the county's strictest, best-documented rule. Under the Montgomery County Sewer Ordinance, the county Health Department reviews and permits every new onsite sewage system, regardless of acreage, and septic tanks must precede any lagoon system. There's a permit fee the health department can quote you. Self-installing is allowed only if you attend a class and pass the state DHSS test. I found no county-specific composting-toilet rule, so that falls back to state DHSS onsite wastewater oversight.

Greywater. Not confirmed at all, no county ordinance or health department guidance specifically addresses greywater reuse. I'd call the Health Department's environmental division before assuming anything.

Rainwater harvesting. No county restriction turned up in my research, so this appears to be permitted, inheriting whatever baseline right exists at the state level.

Wells. The county Health Department offers (and recommends) annual bacteria testing for private well water, processed through the state DHSS lab in Jefferson City. Actual well construction and permitting is a state matter, run through Missouri DNR's Water Well Drillers Act program, not a separate county well ordinance.

Off-grid / utility disconnection. Nothing I found bars going off the public grid. The real gatekeepers are the septic permit for wastewater and standard building permits for any structure you put up.

Bottom line: this county isn't hostile to off-grid living, but it's not hands-off either. Septic is tightly regulated, mobile-home age is capped, and a lot of the smaller questions (tiny homes, RVs, greywater) just haven't been spelled out publicly, so a phone call before you buy land or build will save you headaches.