Off-grid site report

Yankton County, SD

42.8713, -97.3967 · 1,207 ft elevation

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

Zoning & raw-land occupancy

Varies locallyYankton County has an adopted countywide zoning ordinance administered by its Planning & Zoning Office, with the County Commission acting as Board of Adjustment; minimum lot sizes for rural land have been actively debated and can change, so confirm current standards directly. source

Dwellings, tiny homes & RVs

Unclear - verifyThe county ordinance addresses campers, campgrounds, and basement dwelling restrictions, but whether an RV or tiny home can be a permanent year-round single-family dwelling outside a campground is not confirmed. Ask the Planning & Zoning Office. source

Building permits & codes

Varies locallyThe City of Yankton has adopted current IBC/IRC/NEC/plumbing codes with some small structures exempt from permits, but whether unincorporated Yankton County has adopted its own building code separate from the city is not confirmed. source

Septic & composting toilets

Generally allowedSouth Dakota DANR sets statewide onsite wastewater rules, and Yankton County's Planning Department assists directly with septic system installation and compliance. Composting toilets are not separately addressed in sources found. source

Greywater reuse

Unclear - verifyNo Yankton County-specific greywater rule was found; it likely falls under the county's septic review process in coordination with DANR, but this is not confirmed. Ask the Planning & Zoning Office.

Rainwater harvesting

Unclear - verifyNo county-specific rainwater harvesting ordinance was found. State domestic-use water exemptions may indirectly cover it, but there's no direct county statement confirmed.

Private wells & water rights

Generally allowedSouth Dakota DANR does not require a water-right permit for ordinary domestic household well use below set daily/rate thresholds, though well construction must still meet DANR driller and construction standards; no separate county well-permitting layer was found. source

Living disconnected from utilities

Varies locallyNo Yankton County ordinance prohibits off-grid living outright, but plumbing and electrical work remain subject to state licensing regardless of grid status, and whether occupancy permits require utility connection is not confirmed. source

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): 3.0 hrs/day
Yearly output per 1 kW of panels: 1,421 kWh

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Weather1991-2020

Precipitation: 27 in/yr
Snowfall: 35 in/yr
Heating degree days: 7,019 (cold)
Frost-free season: Apr 30 to Oct 5

How far help isstraight-line

Hospital Avera Sacred Heart Hospital: 0.6 mi
Fire station Yankton Fire Department: 0.2 mi
Hardware store Harbor Freight Tools: 1.3 mi
Grocery Yankton Discount Grocery Store: 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 57078).

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.