Off-Grid Living in Sangamon County, Illinois

I've been digging into what it actually takes to live off-grid in Sangamon County, Illinois, and the short version is: it depends heavily on whether your land sits in unincorporated county territory or inside a city/village like Springfield, Chatham, Rochester, or Sherman. Municipal zoning and building codes supersede the county's the moment you're inside town limits, so step one for anyone reading this is figuring out which jurisdiction actually governs your parcel.

For unincorporated Sangamon County, the county does have countywide zoning, administered by the Department of Building and Zoning under the Sangamon County Zoning Ordinance (adopted back in 1969). That department handles building permits, home occupation permits, temporary use permits, and ag-exempt permits, and it's also the office you'd petition for a variance or conditional use, which then goes to the Zoning Board of Appeals for a hearing and recommendation to the County Board.

On the dwelling side, I couldn't find a specific minimum-size standard or a clear rule on living full-time in an RV or tiny home in the ordinance text I reviewed. The zoning code does reference categories like trailer camps and campgrounds, but placement of a tiny home or RV as a permanent residence looks like it would be evaluated case by case through the permit process. Don't guess on this one, call Building and Zoning first.

Building permits themselves are required and administered locally, and Illinois rolled out a new statewide building code baseline effective January 1, 2025, that local jurisdictions now administer. How that applies to owner-built or off-grid structures is worth confirming directly with the county.

Septic and well permitting both run through the Sangamon County Department of Public Health, Environmental Health Division, acting as the local delegate of the Illinois Department of Public Health. Under the state's Private Sewage Disposal Licensing Act, you need a construction permit before any digging or installation of a septic system, and the same framework almost certainly covers composting toilets, though you should confirm acceptance specifics with the county health department directly. Wells fall under the Illinois Water Well Construction Code, with the county health department issuing permits and inspecting the work; the code also requires advance notice to the health department before construction begins.

Greywater reuse, rainwater harvesting, and full utility disconnection are all areas where I found no specific Sangamon County ordinance addressing the practice one way or another. That doesn't mean they're prohibited, it means the county hasn't published clear guidance, so these fall into "confirm before you build" territory. My best guess is greywater would get folded into the same private sewage permitting process, but that's not confirmed.

Bottom line: Sangamon County isn't hostile to off-grid living, but it's also not a place where you can assume silence means permission. Call the offices below before you commit money to a plan.