Off-Grid Living in Monroe County, Michigan

Monroe County, Michigan is one of those places where the county name on the map doesn't mean the county writes the zoning rules. Like most of Michigan, zoning authority here sits with individual townships (Monroe Charter Township, Raisinville Township, and the rest) and with the City of Monroe, not with Monroe County itself. The county's own role is mostly coordination: it helps process rezoning requests, but the Township Planning Commission reviews them and the Township Board makes the final call. So if you're scouting land for an off-grid setup, your very first call needs to be the specific township (or the City, if you're inside its limits), because there is no single Monroe County zoning code to read.

That patchwork matters just as much for dwellings. I didn't find any Monroe County-specific rule addressing tiny homes or living in an RV long-term. That leaves it to whichever township or the City of Monroe's Building Division you're dealing with, layered on top of Michigan's statewide Residential Code (the state has not adopted the simplified Appendix Q for tiny homes, from what I could confirm). Building permits themselves are required no matter where you land, because Michigan's State Construction Code Act pushes enforcement down to local units. In the City of Monroe, the Building Official is the designated enforcing agency; townships run their own building departments the same way. Expect to file a written application before you build anything, and again if you change how a structure is used.

Where Monroe County does have real, direct authority is water and waste, through the Monroe County Health Department. Septic systems need a permit before installation, repair, or replacement, sometimes with plans from a licensed engineer or registered sanitarian, and permits are valid for one year. I did not find a specific county policy on composting toilets, so that's a direct question for the Health Department rather than an assumption I'd make. Private wells work the same way: the Health Department issues water supply permits under the state's Well Construction Code, and the county's Sanitary Code puts the burden on the owner to supply site plans and pay the required fee. Worth noting, and something I'd take seriously if you're planning a well, is that southeastern Michigan (where Monroe County sits) is flagged in the state's Water Well Manual as having more constrained bedrock aquifer conditions, which can affect siting and depth.

Greywater reuse and rainwater harvesting are both areas where I found no county-specific ordinance, which means you're most likely working off the statewide Plumbing Code and Residential Code baseline from LARA rather than any local Monroe County rule, but confirm that with the Health Department before assuming.

On living fully off-grid: there's no explicit county ban on disconnecting from utilities, but in practice the permitting system for wells and septic is the mechanism the county uses to regulate rural, non-municipal living, so "off-grid" here means "permitted off-grid," not "unregulated."