Off-grid site report

Walworth County, SD

45.4600, -100.2537 · 1,887 ft elevation

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

Zoning & raw-land occupancy

RestrictedWalworth County adopted its own countywide Zoning Ordinance No. 2017-1 under SDCL 11-2, creating districts including an Agricultural Land District where non-farm residential use is discouraged. This is a zoned county, not a no-zoning one, so local district rules control raw-land use. source

Dwellings, tiny homes & RVs

Unclear - verifyThe zoning ordinance defines 'structure' broadly, including manufactured homes, but no specific rule on RVs or tiny homes as permanent dwellings was found. Not confirmed; ask the Zoning Administrator directly.

Building permits & codes

Varies locallyWalworth County Planning & Zoning ties compliance to zoning, setbacks, and conditional use permits, but adoption of a specific building code beyond that was not confirmed in available materials. source

Septic & composting toilets

Generally allowedSeptic systems are regulated statewide by South Dakota DANR under its onsite wastewater administrative rule, with Walworth County handling local site visits and approvals; the county's own manual references this state rule directly. source

Greywater reuse

Unclear - verifyNo Walworth County or South Dakota state rule specifically addressing greywater reuse was found; this is not confirmed and likely needs a direct county inquiry.

Rainwater harvesting

Unclear - verifyNo county ordinance or state rule specifically covering rainwater harvesting was found. Domestic water use is generally exempt from water-rights permitting, but that's not a dedicated harvesting rule.

Private wells & water rights

Generally allowedWells are governed statewide by South Dakota DANR; a licensed well driller is required, and domestic use is exempt from water-rights permits unless it exceeds set daily or peak-rate thresholds. No Walworth-specific variance was found. source

Living disconnected from utilities

Varies locallyNo Walworth County ordinance explicitly prohibiting off-grid, utility-disconnected living was found. Zoning, setback, and permit compliance are the main local levers that could indirectly affect an off-grid build; not confirmed whether utility connection is required for occupancy.

Open the full county page with sources →

Sun30-year normals

Peak-sun hours, annual average: 4.9 hrs/day
Worst month (sizes an off-grid array): 2.9 hrs/day
Yearly output per 1 kW of panels: 1,430 kWh

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Weather1991-2020

Precipitation: 18 in/yr
Heating degree days: 7,960 (severe)
Frost-free season: May 7 to Sep 30

How far help isstraight-line

Hospital Mobridge Regional Hospital: 11.2 mi
Fire station: none within range
Hardware store Ace Hardware: 10.3 mi
Grocery Payless Foods: 10.3 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 57631).

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.