Off-grid site report

Mercer County, ND

47.2908, -102.0646 · 1,942 ft elevation

Read this before you act on anything below. This is my researched starting point for Mercer County, ND, 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 rulesMercer County, ND

Zoning & raw-land occupancy

Varies locallyMercer County has countywide zoning through its Planning & Zoning Commission, currently being revised with several draft ordinances pending, and the county's sewage rules set a two-acre minimum lot for non-agricultural uses on private septic. Some townships and cities inside the county keep their own zoning that overrides the county, so always confirm which jurisdiction covers your specific parcel.

Dwellings, tiny homes & RVs

Unclear - verifyI couldn't find a Mercer County document setting minimum dwelling size or specific rules for tiny homes and RVs as residences. The Mercer County Regional Planning Commission says zoning is fragmented among the county's municipalities, so check with your local Zoning Officer for the town or township where the land sits.

Building permits & codes

RestrictedMercer County's Land Use Administrator processes zoning and land-use permits, and a separate sewage disposal construction permit is required before installing an onsite system tied to new construction. Meetings are tied to submitted applications, so plan for lead time before a hearing. source

Septic & composting toilets

Generally allowedSeptic systems are permitted but regulated in detail by Mercer County's Chapter Four special provisions, which require soil suitability review and set setbacks from dwellings, private wells, and public water bodies. Installers also need a state license from the North Dakota Department of Environmental Quality and a permit from the local public health unit; composting toilets aren't separately addressed, so ask the county Land Use Administrator how they'd be treated. source

Greywater reuse

Unclear - verifyNeither Mercer County nor the North Dakota Department of Environmental Quality has a specific ordinance or guidance on residential greywater reuse in the materials I found; the county's sewage rules just fold wastewater into general soil absorption system requirements. Ask the county Land Use Administrator or NDDEQ directly if you're planning a dedicated greywater system.

Rainwater harvesting

Generally allowedI found no Mercer County ordinance restricting or specifically permitting rainwater catchment, which suggests it falls back to the general state baseline of being allowed. There's no additional local permit requirement identified for above-ground catchment systems.

Private wells & water rights

Generally allowedPrivate wells are permitted, with Mercer County's own Water Resource Board coordinating alongside state well-construction standards, and county provisions reference well testing and approval by both a county administrator and the applicable state agency. Confirm the exact testing steps with the Water Resource Board before drilling.

Living disconnected from utilities

Unclear - verifyI found no Mercer County ordinance requiring hookup to grid electric or water utilities as a condition of living on your land. The county is actively drafting Solar and Wind Energy ordinances, so off-grid power rules may firm up soon, worth checking with the Land Use Administrator before you commit to a system.

Open the full county page with sources →

Sun30-year normals

Peak-sun hours, annual average: 4.7 hrs/day
Worst month (sizes an off-grid array): 2.5 hrs/day
Yearly output per 1 kW of panels: 1,379 kWh

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Weather1991-2020

Precipitation: 17 in/yr
Heating degree days: 8,432 (severe)
Frost-free season: May 21 to Sep 18

How far help isstraight-line

Hospital Sakakawea Medical Center: 21.3 mi
Fire station: none within range
Hardware store Ace Hardware: 13.3 mi
Grocery Bronson's Supervalue: 13.5 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 58541).

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.