Off-Grid Living in Caldwell County, Missouri

I've spent a fair bit of time digging through county and state sources for Caldwell County, Missouri, and here's what I found for anyone considering off-grid living there.

Zoning. Unlike a lot of rural Missouri counties that skip zoning altogether, Caldwell County actually has adopted countywide zoning, administered by its Planning and Zoning office. Districts include R-1 Residential, RT-1 Residential/Mobile Home, L-1 Lake, A-1 Agricultural, and C-1 Highway/Convenience. If you're in unincorporated county land, you're supposed to contact Planning and Zoning before you build or add on. If you're inside one of the incorporated cities (Kingston, Hamilton, Braymer, Polo, Cowgill, Breckenridge, Kidder/Mirabile), that city's own rules take over instead of the county's.

Dwellings, tiny homes, RVs. The county's general provisions limit you to one principal building per residential lot, including in the RT-1 mobile home district. There's a nice provision that lets a substandard "lot of record" still get a single-family home regardless of its size. Beyond that, I could not confirm specific rules for tiny homes on wheels or RV occupancy on the county's official pages, so that's a call to make to Planning and Zoning directly.

Building permits and codes. State data shows Caldwell County has not adopted a residential, commercial, or energy code countywide, which fits Missouri's local-option approach (there's no statewide building code). That doesn't mean anything goes, though: the zoning ordinance still requires that buildings conform to district regulations, and you need to check in with Planning and Zoning before building in unincorporated areas. Cities within the county may have adopted their own building codes independently.

Septic and water. The county ordinance requires "safe, adequate" water supply and sewage disposal for any occupied building, per state standards. The Caldwell County Health Department issues septic (OWTS) permits directly, consistent with Missouri DHSS's statewide rule that local health departments handle this in most counties. Composting toilets aren't addressed anywhere I could find officially, so that's unconfirmed. Private wells are allowed but must meet DNR's statewide well construction rules, and the county requires proof of an adequate on-site water supply if you're not on public water.

Greywater and rainwater. I couldn't find any Caldwell County or Missouri DHSS rule specifically addressing residential greywater reuse, so that one's genuinely unclear, ask the Health Department directly if this matters to your plans. Rainwater harvesting looks fine; no county restriction turned up, and Missouri's general legal stance favors landowners collecting it.

Going off-grid generally. Nothing in the county ordinance bans disconnecting from public utilities. It's conditional: private well plus private septic is fine as long as both meet state standards.

Bottom line: Caldwell County is more regulated than many rural Missouri counties because it has actual zoning, but off-grid living itself, wells, septic, rainwater, is generally workable if you follow the state and local water/waste requirements.