Off-grid site report

Day County, SD

45.3659, -97.6153 · 1,795 ft elevation

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

Zoning & raw-land occupancy

Varies locallyDay County has adopted its own countywide zoning ordinance under state authority (SDCL 11-2), administered by the Planning & Zoning Office in Webster; allowed uses depend on the parcel's district, and conditional use permits or variances may apply.

Dwellings, tiny homes & RVs

Unclear - verifyNo published Day County text on minimum dwelling size, tiny homes, or RVs as residences was found; this is set district-by-district internally, so ask Planning & Zoning directly.

Building permits & codes

Unclear - verifyA third-party source references Day County building inspections through Planning & Zoning, but no official county page describes an adopted building code or permit process; South Dakota has no mandatory statewide code unless locally adopted. source

Septic & composting toilets

Generally allowedSeptic systems are regulated under South Dakota's Administrative Rules (Chapter 74:53:01) with a state installer certification program; Day County's Planning & Zoning Office handles local site visits and approvals. source

Greywater reuse

Unclear - verifyNo state statute, DANR rule, or Day County page addresses residential greywater reuse; ask Day County Planning & Zoning whether it falls under septic/wastewater enforcement.

Rainwater harvesting

Unclear - verifyNo state or Day County source specifically addresses residential rainwater harvesting; domestic water uses are generally exempt from water-rights permitting, but this isn't confirmed for rainwater specifically. source

Private wells & water rights

Generally allowedWells must meet South Dakota Well Construction Standards and be drilled by a licensed well driller; a water right permit may be required for non-domestic uses, per DANR, with no Day County-specific addition found. source

Living disconnected from utilities

Varies locallyNo state or Day County rule prohibits living disconnected from utilities; electrical work is state-licensed with an owner's exemption, but zoning approval for the dwelling type itself may still apply.

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: 1,378 kWh

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Weather1991-2020

Precipitation: 25 in/yr
Snowfall: 42 in/yr
Heating degree days: 8,474 (severe)
Frost-free season: May 3 to Oct 3

How far help isstraight-line

Hospital Sanford Webster Medical Center: 4.9 mi
Fire station Waubay Fire Dept: 15.2 mi
Hardware store BMI Agency Storage: 24.1 mi
Grocery Ken's FoodFair: 24.5 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 57274).

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.