Off-Grid Living in Putnam County, Illinois

I've been digging into what it actually takes to live off-grid in Putnam County, Illinois, and here's what I found, along with where the trail runs cold and you'll need to make a call yourself.

Zoning. Unlike some rural Illinois counties that skip zoning altogether, Putnam County has a countywide zoning ordinance administered by the county's Zoning & Floodplain Office, with a Zoning Board of Appeals that handles variances, special uses, and text amendments. So before you buy raw land here assuming nobody's watching, know that there's an active ordinance framework and an office to check in with.

Dwellings, tiny homes, RVs. The ordinance defines recreational vehicles as temporary living quarters, which suggests the county doesn't treat an RV as a permanent residence under zoning. But I couldn't find specific tiny-home minimum-size rules or RV occupancy duration limits in what I reviewed. This is a "call the Zoning Office" question, not a "guess and hope" question.

Building permits. The county runs its own building permit program through the Putnam County Building Department, with an online portal for applications, fees, and inspections. Illinois adopted a statewide building code as of January 1, 2025, and how that layers onto the county's own locally-adopted code wasn't something I could pin down from what's public, so ask the Building Department directly.

Septic. This one's well documented. Septic permitting runs through the Bureau, Putnam & Marshall County Health Departments (BPMHD), operating under Illinois Department of Public Health authority. You'll need a certified soil classifier or licensed engineer to assess soil absorption capacity, and BPMHD requires advance notice before backfilling so they can do a final inspection. Composting toilets specifically weren't addressed in county materials I found, so that's an open question for BPMHD.

Greywater and rainwater. Both are genuinely unclear. I found no Putnam County or BPMHD page specifically addressing residential greywater reuse or rainwater harvesting. That's not a "no," it's a "nobody's written it down that I can find," so ask BPMHD's sewage program directly before you build a system.

Wells. BPMHD also issues private water well construction permits under the state's Water Well Construction Code, and inspects new and modified wells. This is a real, functioning permit process, not a gray area.

Utility disconnection. I didn't find an explicit county rule saying you must or may disconnect from grid electric or water. Indirectly, though, any inhabited dwelling not tied to a public sewage system still needs a private sewage permit through IDPH/BPMHD, so full "off-grid" doesn't mean off-permit for septic.

Bottom line: Putnam County is zoned and permitted, not a free-for-all, but several of the newer off-grid questions (greywater, rainwater, composting toilets) simply haven't been spelled out publicly yet.