Off-Grid Living in Clay County, Missouri

I'll say upfront: Clay County, Missouri is not one of those quiet rural counties where the state's "no statewide building code" reputation actually means anything on the ground. Clay County has its own countywide zoning and building code regime for unincorporated land, run by the Clay County Planning & Zoning Commission (established under state law, RSMo 64.0100). If your parcel sits inside Kansas City, Liberty, Excelsior Springs, Kearney, Smithville, or another incorporated city, forget everything county-related below and call that city instead, since municipal codes take over completely inside city limits.

Zoning and raw land. In unincorporated Clay County, the Planning & Zoning Commission's Land Development Code governs what you can do with a parcel, and simply squatting on raw land without an approved dwelling and permits isn't allowed. The county states plainly that its zoning provisions are minimum requirements for public health and safety, so there's no "just go live in the woods" loophole here.

Dwellings, tiny homes, RVs. This is the toughest one. Clay County explicitly prohibits living in an RV, mobile home, accessory building, or temporary structure on a construction site before, during, or after building your home. The only exception I found is a temporary housing allowance (up to 180 days, by County Commission approval at a hearing) after a fire or natural disaster destroys your primary dwelling. There's no standing provision I found for legal long-term tiny-home or RV residency on vacant land.

Building permits. The county adopted the 2012 family of building codes and requires permits and inspections for nearly all construction. The Planning and Zoning Department (816-407-3380) is your first call to find out if your specific project needs a permit, before you build anything, off-grid or not.

Septic. The Clay County Public Health Center's Environmental Health section permits and inspects onsite sewage systems under 3,000 gallons. County rules require connecting to municipal sewer if it's available and the Health Officer deems it reasonable, and you'll need to submit design plans, calculations, and setback measurements before getting a permit. Composting toilets aren't separately addressed in what I found, so confirm directly with Environmental Health if that's your plan.

Greywater. No county-specific policy turned up in my research. This is genuinely unclear, so I'd call the Public Health Center's Environmental Health office directly.

Rainwater. Nothing in Clay County ordinances restricts rainwater collection, so this follows Missouri's general landowner-friendly baseline.

Wells and water. Much of unincorporated Clay County is served by numbered Public Water Supply Districts (PWSD 2, 3, 5, 6, 8, 9), which operate under DNR drinking-water permits. If you're outside a district's service area and drilling your own well, that falls under Missouri's statewide Well Construction Rules (10 CSR 23) via DNR; no county-specific well ordinance was found.

Utilities. No outright ban on off-grid power or water, but remember: your dwelling still has to clear Planning & Zoning and Building Code review regardless of whether it's grid-tied.

Bottom line: Clay County is a "call before you build" kind of place, not a "figure it out yourself" one.