Off-grid site report

Lyman County, SD

43.7117, -100.0287 · 1,683 ft elevation

Read this before you act on anything below. This is my researched starting point for Lyman County, SD, 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 rulesLyman County, SD

Zoning & raw-land occupancy

Unclear - verifyState law (SDCL 11-2) lets counties adopt zoning ordinances, but it's optional. I could not confirm whether Lyman County has adopted countywide zoning for unincorporated land; the Town of Oacoma may have separate municipal zoning. Confirm directly with the county. source

Dwellings, tiny homes & RVs

Unclear - verifyNo official Lyman County text on tiny homes, minimum dwelling size, or RV occupancy was found. If county zoning exists under SDCL 11-2 it would cover this, but that hasn't been confirmed.

Building permits & codes

Unclear - verifySouth Dakota does not mandate a statewide building code, and it's not confirmed whether Lyman County has adopted any building code or permit requirement for unincorporated land. The county's Director of Equalization office is a possible contact point but wasn't independently verified.

Septic & composting toilets

Generally allowedOnsite wastewater systems are regulated statewide under South Dakota DANR administrative rules and require certified installers. It's not confirmed whether Lyman County has its own septic-permitting office, but the state standard applies regardless.

Greywater reuse

Unclear - verifyNo statewide statute or DANR rule specific to residential greywater reuse was found, and no Lyman County policy was located. Confirm directly with DANR or county environmental health.

Rainwater harvesting

Generally allowedSouth Dakota exempts domestic water use from water right permits unless it exceeds set daily or peak-rate thresholds, per DANR; small household rainwater catchment would likely fall under that exemption. No Lyman County-specific rule was found. source

Private wells & water rights

Generally allowedPrivate wells fall under South Dakota's statewide Water Rights Program and Well Construction Standards, administered by DANR; domestic wells under the state usage threshold don't need a water right permit. No Lyman County-specific well ordinance was found. source

Living disconnected from utilities

Varies locallyNo state law prohibits living off-grid. Electrical work is licensed statewide by the SD Electrical Commission, with an owner's-exemption pathway for one's own residence. No Lyman County ordinance on mandatory utility connection was found.

Open the full county page with sources →

Sun30-year normals

Peak-sun hours, annual average: 5.1 hrs/day
Worst month (sizes an off-grid array): 3.5 hrs/day
Yearly output per 1 kW of panels: 1,459 kWh

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Weather1991-2020

Precipitation: 22 in/yr
Heating degree days: 6,700 (cold)
Frost-free season: May 1 to Oct 5

How far help isstraight-line

Hospital Winner Regional Healthcare Center: 25.3 mi
Fire station Presho City Fire Department: 13.3 mi
Hardware store: none within range
Grocery BJ's Food Center: 15.7 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 57541).

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.