Off-grid site report
Adams County, IL
39.8653, -91.1982 · 764 ft elevationRead this before you act on anything below. This is my researched starting point for Adams County, IL, not legal advice and not a guarantee. Rules change, and the deciding facts on any specific parcel (setbacks, perc results, overlay districts, deed restrictions, road frontage) live at the county or town office, not in any database. Before you buy land or build, confirm the current rules directly with the local zoning and health offices - the sources on this page tell you exactly who to call.
The local rulesAdams County, IL
Zoning & raw-land occupancy
Unclear - verifyNo official Adams County zoning ordinance or map was found; Illinois has no statewide zoning law, so any raw-land rules would be county or township level. Confirm with the Adams County Board whether unincorporated areas have adopted zoning. source
Dwellings, tiny homes & RVs
Unclear - verifyNo official Adams County page on minimum dwelling size, tiny homes, or RV residency was found. This would depend on local zoning/building rules that aren't confirmed.
Building permits & codes
Varies locallyThe Adams County Highway Department requires a Floodplain Development Permit for work in the 100-year floodplain; no general countywide building permit or code page was found, and Illinois had no statewide building code until January 1, 2025. source
Septic & composting toilets
Generally allowedThe Adams County Health Department administers private sewage permitting under Illinois' Private Sewage Disposal Licensing Act and Code (77 Ill. Admin Code Part 905), with IDPH overseeing the program statewide. Composting toilets aren't separately addressed; assume the same framework applies until the health department confirms otherwise. source
Greywater reuse
Unclear - verifyNo Adams County or Illinois state rule specifically on residential greywater reuse was found. Ask the Adams County Health Department, which handles private sewage disposal authority.
Rainwater harvesting
Unclear - verifyNo official Adams County or Illinois state rule on residential rainwater harvesting was found in this research.
Private wells & water rights
Generally allowedThe Adams County Health Department administers well permitting under Illinois' Water Well Construction Code and related state codes, acting as the state's local agent; new wells must meet state-set contamination setback distances and use an IDPH-licensed well contractor. source
Living disconnected from utilities
Unclear - verifyNo Adams County ordinance was found that specifically addresses full disconnection from grid electricity or municipal water/sewer; this would be governed indirectly by any local zoning/building rules, which aren't confirmed for unincorporated areas.
Sun30-year normals
- Peak-sun hours, annual average
- 4.9 hrs/day
- Worst month (sizes an off-grid array)
- 3.2 hrs/day
- Yearly output per 1 kW of panels
- 1,414 kWh
JFMAMJJASOND
Weather1991-2020
- Precipitation
- 41 in/yr
- Heating degree days
- 5,587 (cold)
- Frost-free season
- Apr 11 to Oct 25
How far help isstraight-line
- Hospital
Blessing Hospital - 11.8 mi
- Fire station
Quincy Fire Department - 11.8 mi
- Hardware store
Lowe's - 8.0 mi
- Grocery
Walmart Supercenter - 8.7 mi
From OpenStreetMap. Road miles will be longer, often much longer in hill country.
Plan this spot
These open with this location's real numbers already filled in (ZIP 62360).
Size a solar systemHeat loss & insulationFirewood per winterRainwater harvestGarden sizePanel tilt
Looking at a specific parcel in Adams County, IL?The rules above are the jurisdiction. The land check runs the parcel itself: flood zone, soils and septic suitability, wetlands, slope, access, climate, and these verdicts, from a parcel number or coordinates.
Check a parcel →Share or save this report:New report
Sources: US Census Bureau geocoder; NLR PVWatts v8 (solar); NOAA NCEI 1991-2020 climate normals (nearest station) or Open-Meteo (ZIP-centroid) for weather; Open-Elevation; OpenStreetMap contributors. Public data retrieved Aug 22, 2026; agencies update their layers on their own schedules. Planning data, not a survey or legal advice.
New here, or not sure where this fits? Start here walks through the whole thing in order.