Off-Grid Living in Dunklin County, Missouri

I've been digging into Dunklin County, Missouri for this one, and the honest headline is: there's no countywide zoning or building code in the unincorporated areas, but that doesn't mean "anything goes." Here's what I found and what's still an open question.

Zoning. I could not locate any Dunklin County planning/zoning ordinance on an official county site, and the county's own department directory doesn't list a planning & zoning office with adopted code. That lines up with general reporting that many rural Missouri counties, including this one, never adopted countywide zoning. If your parcel sits inside Kennett, Campbell, Malden, Arbyrd, or Cardwell city limits, though, that town's own zoning applies, not the county's, so check with the specific city hall.

Dwellings, tiny homes, RVs. Same story, nothing I found at the county level. No ordinance on dwelling size, tiny homes, or living in an RV in unincorporated Dunklin County. Again, this could be different inside a town, but I didn't find a confirmed municipal code either.

Building permits. Missouri's own state data portal lists Dunklin County as having no county-adopted IRC or IECC edition, consistent with Missouri's general approach that building code adoption is a local, not statewide, decision. In unincorporated areas, this likely means no county building permit process at all for a standalone off-grid structure, but confirm with the County Commission's office since I didn't find a clear building-permit page. Cities in the county run their own permitting.

Septic and composting toilets. This is the one dimension with real teeth. The Dunklin County Health Department, following Missouri state law in effect since 1996, requires an On-site Wastewater Disposal System permit for new systems and major repairs on nearly all single-family dwellings, with narrower exceptions tied to larger deeded acreage. There's also a specific carve-out letting a homeowner install their own permitted system on their own dwelling, provided they follow state rules. Composting toilets aren't separately addressed, so I'd assume the same permitting framework applies unless the health department tells you otherwise.

Greywater. Not confirmed anywhere at the county or state level in my research. Ask the Health Department directly before you build a greywater system.

Rainwater harvesting. No county restriction found, so this inherits Missouri's generally permissive baseline.

Wells. Well construction statewide, including here, runs through Missouri DNR's Water Well Drillers program. No separate Dunklin County well ordinance turned up.

Utility disconnection. Nothing prohibits going off-grid in unincorporated Dunklin County that I could find. Your real constraints are septic and well rules, not a utility-hookup mandate.

Bottom line: county-level freedom, state-level constraints on septic and wells, and town-level rules if you're inside city limits. Call before you build.