Off-grid site report

Piatt County, IL

40.0265, -88.5732 · 666 ft elevation
Read this before you act on anything below. This is my researched starting point for Piatt 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 rulesPiatt County, IL

Zoning & raw-land occupancy
Varies locallyUnincorporated land is zoned by the Piatt County Zoning Office under the county ordinance; land inside Monticello, Bement, or other towns is zoned separately by that municipality. source
Dwellings, tiny homes & RVs
Unclear - verifyNo specific county rule on tiny homes, minimum size, or RV residency was found; setback rules exist but occupancy standards for unconventional dwellings need direct confirmation from the Zoning Office. source
Building permits & codes
RestrictedPiatt County requires a building permit for unincorporated land, and Illinois state law requires compliance with the state plumbing, fire safety, residential, and energy codes. Municipalities issue their own separate permits inside town limits. source
Septic & composting toilets
Generally allowedThe DeWitt-Piatt Bi-County Health Department, under IDPH authority, must approve septic plans before a building permit is finalized; composting toilets are not separately addressed locally. source
Greywater reuse
Unclear - verifyNo dedicated county or health department page on greywater reuse was found; it likely falls under the same private sewage permitting process, but that is not confirmed.
Rainwater harvesting
Unclear - verifyNo official Piatt County or health department guidance on rainwater harvesting was found.
Private wells & water rights
Generally allowedA local water well ordinance enforced by the DeWitt-Piatt Bi-County Health Department requires a permit before any well is constructed or deepened.
Living disconnected from utilities
Unclear - verifyNo ordinance was found that directly addresses full grid disconnection; in practice a dwelling still needs an approved well/septic and building permit even if not tied to public utilities.

Open the full county page with sources →

Sun30-year normals

Peak-sun hours, annual average
4.8 hrs/day
Worst month (sizes an off-grid array)
3.0 hrs/day
Yearly output per 1 kW of panels
1,398 kWh
JFMAMJJASOND

Weather1991-2020

Precipitation
40 in/yr
Heating degree days
5,928 (cold)

How far help isstraight-line

Hospital
OSF Heart of Mary Medical Center
19.4 mi
Fire station
Seymour Village Fire Department
9.5 mi
Hardware store
True Value
0.2 mi
Grocery
County Market
0.2 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 61856).

Size a solar systemHeat loss & insulationFirewood per winterRainwater harvestGarden sizePanel tilt

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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. Planning data, not a survey or legal advice.