Off-Grid Living in Stephenson County, Illinois

If you're eyeing unincorporated land in Stephenson County, Illinois for an off-grid setup, here's what I found digging through the county's own code and health department pages. Note this covers unincorporated county land only, towns like Freeport, Lena, and Pearl City run their own separate zoning and building rules.

Zoning. Stephenson County adopted its own zoning ordinance back in 1971 and has amended it since, so this isn't one of those counties with no rules at all. The County Board splits land into 18 districts, agricultural (A-1, A-2) and various residential classes. In at least one residential district I found, lots need two acres with an approved septic system and a minimum 200-foot width at the building line. Confirm your parcel's district and dimensional requirements with the Zoning Department before you buy.

Dwellings, tiny homes, RVs. Each lot is generally limited to one principal building (farms can have up to two farm dwellings). Mobile and manufactured homes are treated separately: they must comply with the Illinois Mobile Home Tiedown Act, and placing one in the R-6 district requires a building permit through Zoning. I found no county provision specifically addressing standalone tiny homes or living full-time in an RV outside a mobile home park, so that's genuinely unconfirmed. Ask Zoning directly if that's your plan.

Building permits. The county hasn't adopted a uniform building code, so what you'd elsewhere call a "building permit" is here a Zoning Certificate. As I understand it, most new construction 120 square feet or larger, including sheds, decks, and garages, needs one before you start. A state law (Public Act 096-0704) requires ICC/NFPA-compliant inspection before occupying new commercial buildings in non-building-code jurisdictions like this one; whether that extends to single-family homes isn't clear from what I found, so verify residential applicability with Zoning.

Septic. Any site without central sewer needs a septic system approved by the Stephenson County Health Department, which administers this under the state's IAC Title 77 Part 905 Private Sewage Disposal Code. I didn't find a county rule addressing composting toilets specifically, so the state baseline likely applies.

Greywater and rainwater. I couldn't find county ordinances covering either. Not confirmed, ask the Health Department for greywater, since it may fall under private sewage rules by default.

Wells. You need a Health Department permit before constructing or deepening a private well, under state well codes (77 Ill. Adm. Code 920 and related) that the county has adopted by reference. Community public water wells go through Illinois EPA instead.

Full utility disconnection. No outright ban that I found, but a legal dwelling still needs an approved septic (or sewer connection) and, if applicable, a permitted well, so "off-grid" doesn't mean "unregulated."