Building permits, zoning and land rules in Fall River County, South Dakota

A county building permit is required in unincorporated Fall River County only when the proposed building lies within the floodplain¹. Outside the floodplain condition, Fall River County says there are no county building permits, but homeowners still must comply with South Dakota plumbing and electrical permitting¹. The county also requires owners to report a new structure, addition, relocated mobile home, demolition or major unrepaired damage to the Director of Equalization¹.

Floodplain work is not a paperwork exception: development in the floodplain requires a permit, and the county GIS Department determines whether the proposed site is mapped there¹. Give GIS the proposed building location before finalizing a house pad or site plan¹. We could not confirm a general county building-code adoption or a certificate-of-occupancy requirement for unincorporated land, so ask GIS about those points when the parcel or project is unusual¹.

Fall River County does not describe a general rural building department; the county directs floodplain-location questions to the GIS Department and property-change reports to the Director of Equalization¹. The GIS Department can check the proposed building site and explain the floodplain permit path¹. The Director of Equalization receives notice of new structures and other property changes¹.

State trade permits remain part of the job even when no general county building permit applies¹. South Dakota requires a plumbing inspection certificate for covered plumbing installations outside cities that run their own inspection systems⁵. Electrical work subject to state inspection needs a rough-in inspection before it is covered and a final inspection before occupancy². Electrical and plumbing fees vary with the work, and a qualifying homeowner's exemption does not remove applicable permit fees or inspections^2,6.

Fall River County has no planning and zoning outside the incorporated cities of Hot Springs and Edgemont, so there are no county zoning districts for that unincorporated land¹. Unincorporated land has no county-zoning minimum dwelling size, minimum lot size, building-height limit, lot-coverage limit or zoning setback¹. Floodplain, septic, access and state trade rules still apply^1,3.

Inside Hot Springs or Edgemont, contact the relevant city because municipal zoning and building rules may apply⁷. Plats adjacent to either city, including lots in subdivisions adjacent to a city boundary, require approval from both the county commissioners and the city¹. Before assuming a rural parcel is outside municipal jurisdiction, verify the parcel location and whether a proposed split triggers the joint plat process¹.

On-site wastewater systems in Fall River County must comply with South Dakota regulations, administered by the South Dakota Department of Agriculture and Natural Resources³. The state standards are minimum requirements, and local governments may impose stricter ones⁸. DANR publishes installation requirements and a checklist for plans, while the South Dakota Plumbing Commission certifies installers³.

Do not assume a conventional drain field will work merely because county zoning is absent. Only 12.5% of mapped county soils are rated without severe limitations for a conventional septic drain field, so a site evaluation should be an early due-diligence item⁹. If public wastewater is available, state rules do not allow an on-site system; where sewer is unavailable, an approved on-site septic system or other treatment process is required⁴. We could not confirm a universal septic-permit or countywide septic-inspection requirement, so ask DANR what review the specific system design needs before excavation³.

Unincorporated Fall River County has no county zoning-based restriction on tiny-home occupancy outside Hot Springs and Edgemont, but floodplain, wastewater, plumbing and electrical rules still apply¹. We could not confirm a county rule expressly allowing full-time residence in an RV, so ask the county GIS Department about the parcel and proposed use before buying¹.

Where public sewer is unavailable in rural Fall River County, an approved on-site septic system or other treatment process is required, and conditional off-grid sanitation options are allowed under state requirements⁴. A qualifying owner may personally install electrical wiring in an owner-occupied residence or farmstead after obtaining an approved homeowner permit; rental and commercial property are excluded². A qualifying owner may also personally install plumbing in a single-family residence under a state homeowner permit, with state code, fee and inspection requirements still applying².

1. Confirm that the parcel is outside Hot Springs and Edgemont; city rules apply inside those municipalities, and some plats near their boundaries need both city and county approval^1,7.
2. Send the proposed building location to Fall River County GIS and determine whether a floodplain permit is required¹.
3. Plan wastewater with DANR and a certified installer, especially because most mapped soils have severe limitations for a conventional drain field^3,9.
4. Determine the state plumbing and electrical permits and inspection sequence before work is covered^2,5.
5. Obtain an approach easement from the Highway Department if the driveway exits directly onto a county road; state-highway access instead requires South Dakota Department of Transportation permission^1,10.
6. Report the completed property change to the Fall River County Director of Equalization¹.

Start with water, wastewater, flood exposure and legal access. Rural water service does not reach every Fall River County property, and a public sewer connection rule was not established for every rural parcel⁴. A water-right permit is required only for proposed uses that fall within South Dakota's permitting requirements; when one is required, approval must come before well drilling¹¹.

Check the precise homesite rather than relying on a parcel-level impression. The county GIS Department determines floodplain status, while the soils data show only 12.5% of mapped soils without severe limitations for a conventional drain field^1,9. Confirm whether access is from a county road or state highway because the approving authority changes^1,10. Finally, budget for an effective property-tax rate of about 1.1% and a median annual property-tax bill of about $1,876, while recognizing that the actual assessment depends on the property⁹.