Off-Grid Living in Mecosta County, Michigan

If you're looking at land in Mecosta County, Michigan for an off-grid setup, here's what I found in my research, with the caveat up front: I'm not a lawyer, and I'm relaying what official pages say, not personal experience.

Zoning is countywide here, which is unusual. Most rural Michigan counties leave zoning entirely to townships, but Mecosta County actually runs its own countywide zoning ordinance through the Mecosta County Building & Zoning Department. That said, some townships (Morton Township is one example) and incorporated cities like Big Rapids keep their own separate zoning, so before you buy anything, I'd confirm with the county which authority actually governs your specific parcel.

Building permits are issued by the county Building & Zoning Department, but only for unincorporated areas. If your land sits inside a city, that city's own building department takes over. The department enforces the Michigan Residential Code and Michigan Building Code, both state-level codes, on top of the local zoning ordinance. Michigan state law (often cited as PA 230 of 1972) does let homeowners pull their own permits and do their own work, but you're on the hook legally for code compliance either way.

Septic and wells are not handled by the county at all. That job belongs to District Health Department #10 (DHD#10), a multi-county health district that covers Mecosta County. DHD#10 evaluates sites, permits and inspects septic systems and wells, and homeowners are allowed to install their own septic system (non-homeowners doing the work need to be DHD#10-licensed). I could not confirm any official rule on composting toilets, so if that's part of your plan, call DHD#10 directly and ask.

Greywater and rainwater harvesting don't appear to have county-specific rules I could find. That likely means the Michigan state plumbing and residential codes (administered by LARA) set the baseline, but I'd confirm this with the county or DHD#10 rather than assume.

Full utility disconnection isn't explicitly banned in anything I found, but the county's building/zoning permit application asks you to specify your type of sewage disposal and water supply. Functionally, that means you're expected to have an approved well/septic or public hookup before you'll get sign-off, so going fully off-grid on water and waste without any approved system is going to run into friction at the permit stage.

Tiny homes and RVs: a non-official source claims the county dropped minimum square footage rules in 2018, but I couldn't verify that on an official page, so treat it as unconfirmed. RVs and campers used as structures fall under a specific county ordinance on temporary and portable buildings, and using an RV as a full-time residence outside a campground is likely to run into the same water/sewage approval requirements as any other dwelling.

Bottom line: Mecosta County's dual-authority setup (county zoning/building plus a separate multi-county health district for septic and wells) means you'll likely be making at least two phone calls before you break ground.