Off-grid site report

Sanilac County, MI

43.4203, -82.8570 · 778 ft elevation

Read this before you act on anything below. This is my researched starting point for Sanilac County, MI, 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 rulesSanilac County, MI

Zoning & raw-land occupancy

Varies locallyZoning is set by individual townships, not the county, so permitted land uses and raw-land occupancy rules depend entirely on which township your parcel is in. Contact your specific township office to confirm. source

Dwellings, tiny homes & RVs

RestrictedDwellings must meet the Michigan Residential Code as enforced by the county's construction department, and at least in Sanilac Township, RVs are explicitly excluded from counting as a dwelling. source

Building permits & codes

RestrictedBuilding permits are required from the Sanilac County Department of Construction & Land Use, and township zoning/land-use approval must accompany that application. source

Septic & composting toilets

RestrictedThe Sanilac County Health Department's Environmental Health Division permits on-site sewage systems under state Public Health Code authority; composting-toilet acceptance as a sole system is not confirmed, so ask the Health Department. source

Greywater reuse

Generally allowedNo Sanilac County-specific greywater ordinance was found; it likely falls under the statewide Michigan Plumbing Code administered by LARA, but this is not confirmed at the county level.

Rainwater harvesting

Generally allowedNo county-specific restriction on rainwater harvesting was found; it likely follows the statewide plumbing code appendix, but this is not confirmed locally.

Private wells & water rights

Generally allowedPrivate wells are permitted with a required permit from the Sanilac County Health Department, which enforces the state Water Well Construction Code locally.

Living disconnected from utilities

Unclear - verifyNo explicit county ban on full utility disconnection was found, but at least Sanilac Township's ordinance requires an approved well and septic system when public water/sewer isn't available, effectively ruling out a fully systemless dwelling. source

Open the full county page with sources →

Sun30-year normals

Peak-sun hours, annual average: 4.4 hrs/day
Worst month (sizes an off-grid array): 1.8 hrs/day
Yearly output per 1 kW of panels: 1,279 kWh

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Weather1991-2020

Precipitation: 32 in/yr
Heating degree days: 7,240 (cold)
Frost-free season: May 2 to Oct 16

How far help isstraight-line

Hospital Mckenzie Health System: 1.3 mi
Fire station Marlette Fire Department: 12.3 mi
Hardware store True Value: 15.5 mi
Grocery Walmart Supercenter: 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 48471).

Size a solar system Heat loss & insulation Firewood per winter Rainwater harvest Garden size Panel tilt

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.