Off-Grid Living in Miller County, Missouri

Miller County, Missouri is one of those places where I have to be upfront: the county's own official website did not show up with usable planning, zoning, building, or health department pages in my research. So most of what I can tell you here is either the Missouri state baseline, or what applies inside the City of Eldon (an incorporated town within the county that does have an official code on the books). If you're looking at raw land in unincorporated Miller County, you'll need to call the county directly to fill in the gaps I couldn't confirm.

Zoning: Missouri's Chapter 89 gives counties the power to zone, but each county decides whether to adopt it. I found no official Miller County page confirming a countywide zoning ordinance for unincorporated land. Inside Eldon, though, the city's own code (hosted on eCode360) confirms zoning districts under an official zoning map. So: zoning outside town limits is unclear, zoning inside Eldon is real and enforced.

Dwellings, tiny homes, RVs: Eldon's code has real teeth here (assessor declaration, siting inspections, foundation and utility hookup requirements). I found nothing official for unincorporated Miller County addressing tiny homes, minimum square footage, or RV residency, so that's not confirmed, not permitted, not prohibited, just unknown from what I could verify.

Building permits: Same story. Eldon references an adopted Building Code for footings, egress, and utility attachment. No official county building department page turned up, so I can't tell you whether unincorporated land requires a permit at all.

Septic: This one has a real statewide framework worth knowing. Missouri's Department of Health and Senior Services (DHSS) sets minimum onsite sewage system standards statewide, effective since the mid-1990s. But the actual permitting authority varies by county: in some counties it's a Local Public Health Agency, in others DHSS staff directly, and in others a local ordinance sets stricter rules. DHSS has an official county-selector tool to tell you which applies to Miller County specifically, since I couldn't pin that down from this search round. Composting toilets aren't separately addressed anywhere I found.

Greywater and rainwater: No Miller County or Missouri-specific rule on greywater reuse turned up, so that's genuinely unclear. Rainwater harvesting looks fine under the state baseline, no restriction found.

Wells: Missouri DNR governs well construction statewide under its Water Protection Program rules. No Miller County-specific well ordinance was confirmed.

Off-grid utilities: Nothing found restricting it at the county level; state baseline protections seem to apply uncontradicted.

Bottom line: if you're eyeing unincorporated Miller County land, treat this guide as a starting point and call the county assessor's office and DHSS directly before you commit to anything.