Off-Grid Living in Boone County, Missouri

I've been digging into Boone County, Missouri for anyone thinking about going off-grid there, and the first thing I want to flag is this: Boone County is different from a lot of rural Missouri counties because it actually has adopted countywide zoning and building codes for its unincorporated areas. That's administered through the county's Resource Management Department. If you're looking at land inside Columbia, Ashland, Centralia, or another incorporated town, none of this applies, those towns run their own separate rules and you need to check with them directly. Everything below is for unincorporated Boone County.

Zoning. The county's Planning & Zoning division (part of Resource Management) handles land use requests, zoning changes, conditional use permits, and variances for unincorporated land. There is an actual zoning map in play here, so before you buy or build, I'd call and ask how your specific parcel is zoned.

Dwellings, tiny homes, RVs. The county has adopted the International Residential Code, which sets standards for single- and two-family dwellings. I could not confirm any specific carve-out for tiny homes under a minimum size, or a standalone allowance for living in an RV full-time. Some commercial "off-grid guides" claim tiny homes are fine here, but I couldn't verify that against an actual county source, so treat it as unconfirmed and call Resource Management directly.

Building permits. Boone County adopted the 2015 International Codes (IRC and IECC), effective for permits issued from that date forward. The Boone County Inspections Division handles this for unincorporated areas (Columbia has its own building department). Agricultural buildings are exempt from these code provisions.

Septic. This one's regulated, not optional. Boone County has its own local ordinance for onsite wastewater systems, which means Missouri DHSS doesn't have direct jurisdiction here, the county does. This function now sits with Boone County Resource Management (it moved over from the health department in 2022). Septic and lagoon systems follow statewide design criteria. Composting toilets aren't addressed anywhere I could find, officially unconfirmed.

Greywater. I found nothing specifically addressing greywater reuse separate from the general wastewater ordinance, at either the county or state level. Unconfirmed, worth a direct call.

Rainwater harvesting. No county ordinance restricting it that I could find. Missouri's state-level baseline protecting rainwater collection appears to apply here without local modification.

Wells. This is state territory, not county. Missouri's Water Well Drillers Act and the Well Construction Rules (administered by DNR's Missouri Geological Survey) set the standards. Generally a permit is needed to construct a well, though landowners drilling and installing their own pump are exempt from the driller-permit requirement (but still must follow the other construction rules). No separate Boone County well ordinance exists on top of that.

Utilities. I found no Boone County requirement forcing you to hook up to public water, sewer, or electric. But going off-grid doesn't get you out of septic, well, and building code compliance, those still apply regardless of utility hookups.

Bottom line: Boone County is more regulated than the "wild west" rural counties some off-gridders look for, but it's also transparent about what it wants. Call before you commit to a plan.