Mellette County, SD zoning map, flood zone and property lines by address
Free, no account. Or open the South Dakota map and tap a lot.
Towns in Mellette County: White River.
Property lines
The parcel outline, parcel number and mapped size come from the South Dakota county parcel layers (each county publishes its own), so a Mellette lot shows the same lines the county director of equalization draws. Mellette County covers about 836,679 acres of land and 2,276 acres of water.
Mapped lines are approximate. The Mellette County director of equalization keeps the parcel record (Mellette County website); a licensed surveyor sets the true corners.
Zoning
Mellette County zones its unincorporated land, and White River zones the land inside its limits. ParcelSheet shows the use the county director of equalization lists for the lot and links the county planning and zoning office for the district, the uses it allows and the lot size it needs.
ADU and guest houses
Under South Dakota's county planning and zoning law (South Dakota Codified Laws Chapter 11-2), local governments can allow an accessory dwelling unit on a lot with a house. Whether a Mellette lot can add one depends on its district; the county planning and zoning office has the rule. ParcelSheet shows the mapped lot size and the ground's slope, the first two things the question turns on.
Septic and soil
ParcelSheet reads the USDA soil survey at the lot: the soil's name, its septic absorption rating and whether it is prime farmland. Mellette County is soil survey area SD095, Mellette County, South Dakota, last updated September 2026, on Web Soil Survey.
A new or changed septic system in Mellette County must follow the South Dakota Department of Agriculture and Natural Resources onsite rules, installed by a state certified installer; Mellette County may add its own permit.
Setbacks
Setbacks in Mellette County come from the zoning district: the front, side and rear distances a house must keep. ParcelSheet does not draw setback lines; the county zoning office gives them for the lot's district, and White River for land inside its limits.
Hazards that apply
- Wetlands and wildfire. ParcelSheet shows the National Wetlands Inventory near a Mellette lot and the Forest Service wildfire hazard rating at it.
Questions
How do I find property lines in Mellette County?
Open the South Dakota map, type the address, and the parcel outline from the Mellette County director of equalization shows on the map with its parcel number and mapped size. Mapped lines are approximate; only a licensed surveyor sets the true corners.
What is my property zoned in Mellette County?
Zoning in Mellette County is set by the county for unincorporated land and by each city (such as White River) inside its own limits. ParcelSheet shows the use code the county director of equalization lists and links the office that sets the zoning; the planning office has the final word.
Can I build an ADU in Mellette County?
Under South Dakota's county planning and zoning law (South Dakota Codified Laws Chapter 11-2), counties and cities can allow an accessory dwelling unit, and each sets its own rules. In Mellette County ask the zoning office for the lot's district first; ParcelSheet shows the lot size as mapped so you can see the room you have.
Do I need a septic permit in Mellette County?
Yes. A new or changed septic system in Mellette County must follow the South Dakota Department of Agriculture and Natural Resources onsite rules, installed by a state certified installer; Mellette County may add its own permit. ParcelSheet shows the USDA soil survey's septic rating at the lot, from survey area SD095 (Mellette County, South Dakota).
What can I build on 5 acres in Mellette County?
Zoning in Mellette County is set by the county for unincorporated land and each city inside its own limits (such as White River). The zoning district decides the uses, how many homes and the smallest lot it allows on 5 acres. ParcelSheet shows the lot size as mapped and the use code on the parcel record; the planning office has the district and its rules. See the Mellette County website.
What are the residential setbacks in Mellette County (2026)?
Setbacks in Mellette County come from the zoning code of the county, or of the city when the lot is inside city limits: the front, side and rear distances depend on the lot's district. ParcelSheet does not draw setback lines or give a number it did not read; the zoning office gives them for the district. See the Mellette County website.
Next to Mellette County: Jackson County, Jones County, Lyman County, Todd County, Tripp County.
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