Off-Grid Living in Vermilion County, Illinois

I'll be upfront: Vermilion County, Illinois, doesn't have a lot of its rules spelled out in public, official documents, so this guide is as much about who to call as what the answer is. And a quick warning, because I ran into this myself while researching: don't confuse this county with Vermillion County, Indiana, just across the border. Similar name, different state, different rules entirely. I excluded anything I found that turned out to be Indiana material.

Zoning. From what I can find, Vermilion County does not appear to have a comprehensive countywide zoning ordinance on the books, at least not one hosted on the county's own site. The one zoning-adjacent ordinance I could confirm is a Solar and Wind ordinance that covers energy-siting only. A commercial directory mentions a "Building & Grounds / Planning" office handling planning and zoning for unincorporated parts of the county, but I couldn't verify a full ordinance text. If your land is inside Danville or another incorporated town, that municipality's own code applies instead, and Danville's is hosted separately on American Legal.

Dwellings, tiny homes, RVs. Not confirmed. I found no county ordinance on minimum dwelling size, tiny homes, or RV/manufactured-home residency. This likely comes down to whatever building or planning rules exist locally, which I couldn't pin down.

Building permits. There's apparently a "Planning and Building" or "Building & Grounds" function at the county, but I couldn't locate its own permitting page, which code edition (if any) it's enforcing, or how Illinois's newer statewide building code requirements factor in. Call the county directly before you build.

Septic and composting toilets. This one is solid. The Vermilion County Health Department issues permits for private sewage disposal systems, following the Illinois Department of Public Health's Private Sewage Disposal Licensing Act and Code. You need a permit before construction starts, and the county handles design review, sizing, and inspection. Composting toilets aren't separately addressed, so they likely fall under this same sewage framework, best to ask the Health Department directly.

Greywater. Not addressed anywhere I could find, county or state. Assume it may need to route through your permitted septic system unless the Health Department's Environmental Health Division tells you otherwise.

Rainwater harvesting. No county or state rule found either way. Nothing suggests it's prohibited, but nothing officially blesses it either.

Wells. Solid ground here too. The county Health Department's Potable Water Program issues well permits and follows the Illinois Department of Public Health's Water Well Construction and Pump Installation Codes. Closed-loop geothermal wells also need a permit through the same office. Statewide, well work must be done by a licensed contractor under Illinois law.

Off-grid utility disconnection. Not confirmed. No ordinance explicitly bars living without grid power or municipal water/sewer that I could find, but habitability standards under local building codes, if any exist for unincorporated areas, could theoretically come into play.

Bottom line: septic and wells are well-documented and county-administered under state code. Zoning, dwelling standards, and utility disconnection are genuinely murky here, so a phone call to the county saves guesswork.