Off-grid site report
DeKalb County, IL
41.9043, -88.7474 · 899 ft elevationRead this before you act on anything below. This is my researched starting point for DeKalb 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 rulesDeKalb County, IL
Zoning & raw-land occupancy
RestrictedDeKalb County has a comprehensive Zoning Ordinance (Chapter 53) for unincorporated land, administered by the Community Development Department. Land inside incorporated towns like DeKalb or Sycamore follows that town's own code instead. source
Dwellings, tiny homes & RVs
RestrictedStandalone tiny homes, mobile homes, or RVs as full-time independent residences are not a matter-of-right use; the county has used an Interim Special Use / Special Use Permit process for manufactured homes in limited hardship cases. Specifics on minimum size or RV residency timelines are not confirmed. source
Building permits & codes
RestrictedDeKalb County requires a building permit through Community Development and has adopted the 2021 IRC, 2021 IMC/fuel gas/pool codes, 2020 NEC, and 2014 Illinois Plumbing Code, updated most recently by Ordinance 2024-11. source
Septic & composting toilets
Generally allowedThe DeKalb County Health Department issues sanitation permits, requires IDPH-licensed installers, and may require a percolation test; private systems are restricted where public sewer is available nearby, per county sewage code. source
Greywater reuse
Unclear - verifyNo DeKalb County code or health department page specifically addresses residential greywater reuse; it would likely fall under general sewage disposal permitting, but this is not confirmed. Ask the Health Department directly.
Rainwater harvesting
Unclear - verifyNo DeKalb County ordinance or health department publication was found that specifically authorizes, regulates, or prohibits residential rainwater harvesting. Not confirmed either way.
Private wells & water rights
Generally allowedThe DeKalb County Health Department administers well permits locally under the state Water Well Construction Code and can suspend or revoke permits for violations, per recent Ordinance O2025-14 amending Chapter 39. source
Living disconnected from utilities
Unclear - verifyNo explicit DeKalb County rule bans disconnecting from grid electric or municipal water, but mandatory building, septic, and well codes mean a permitted dwelling still needs code-compliant systems even off-grid. Not directly confirmed as a standalone rule.
Sun30-year normals
- Peak-sun hours, annual average
- 4.6 hrs/day
- Worst month (sizes an off-grid array)
- 2.5 hrs/day
- Yearly output per 1 kW of panels
- 1,320 kWh
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Weather1991-2020
- Precipitation
- 37 in/yr
- Snowfall
- 32 in/yr
- Heating degree days
- 6,820 (cold)
- Frost-free season
- Apr 26 to Oct 11
How far help isstraight-line
- Hospital
Rochelle Community Hospital - 16.3 mi
- Fire station
DeKalb Fire Department - Station 2 - 0.8 mi
- Hardware store
Lowe's - 3.2 mi
- Grocery
Schnucks - 1.8 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 60115).
Size a solar systemHeat loss & insulationFirewood per winterRainwater harvestGarden sizePanel tilt
Looking at a specific parcel in DeKalb 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.