Bolthole Index

Dewey County, South Dakota

Building permits, zoning and land rules in Dewey County, South Dakota

46Index Score / 100
#41 of 66 in South Dakota

Dewey County, South Dakota does not publish enough information to confirm whether a county building permit is required on unincorporated land.1 The county's zoning status is also unconfirmed, so contact the Dewey County Auditor before buying land or starting site work.23 State septic standards and state-administered electrical and plumbing requirements can still apply even when the local permit path is unclear.456

At a glance

Building permit
County requirement not confirmed; ask the County Auditor13
Zoning
County zoning status not confirmed; ask before choosing a use or site23
Septic
State minimum standards apply; local governments may be stricter4
RV living
Not confirmed; ask the County Auditor about the parcel and proposed occupancy3
Tiny home
County occupancy and dimensional rules not confirmed2
Owner electrical work
Allowed for a qualifying owner-occupied residence or farmstead, with a homeowner permit and inspections7
Well
Some proposed water uses require state approval before drilling8

Who to call

Also useful

Dewey County Auditor

County records, County Commission agendas and routing questions to the appropriate county office

(605) 865- 3672

PO Box 277, Timber Lake, SD 57656

Septic permits

South Dakota Department of Agriculture and Natural Resources

State on-site wastewater installation standards and plan questions

(605) 773-4647

523 E Capitol Ave, Pierre, SD 57501-3182

Contact details are copied from each office’s official page and were checked against it on September 28, 2026.

Do you need a building permit in Dewey County, South Dakota?

A Dewey County building-permit requirement for construction on unincorporated land could not be confirmed from the available county information.1 Treat that as an unanswered local question, not as permission to build without approval. Ask the Dewey County Auditor to identify the office or County Commission record governing the parcel before ordering materials or beginning excavation.3

Separate state requirements remain concrete. Plumbing installations outside cities that administer their own inspection requirements need a state plumbing inspection certificate and inspection.6 Electrical work subject to state inspection needs a rough-in inspection before wiring is covered and a final inspection before occupancy.5 A qualifying owner may personally wire an owner-occupied residence or farmstead, but the owner exemption is from licensure rather than from the homeowner permit and inspections.7

Who handles Dewey County building permits and land-use questions?

No Dewey County building, codes, or planning department was identified in the available county information.12 The practical first call is the Dewey County Auditor at PO Box 277, Timber Lake, SD 57656, phone (605) 865- 3672.3 The Auditor keeps county records and prepares County Commission agendas, making that office the verified place to ask for the current ordinance, relevant commission action, or correct local contact.3

Ask a parcel-specific question: give the legal description, say whether the land is inside a municipality or unincorporated, describe the proposed structure and use, and ask whether any building, land-use, floodplain, driveway, or occupancy approval applies. The building-permit requirement, permit process, county fees, inspections, and certificate-of-occupancy process could not be confirmed, so obtain the answer before work begins.1

Does Dewey County have zoning?

Dewey County's current zoning status for unincorporated land could not be confirmed.2 South Dakota law authorizes county boards to adopt zoning rules covering matters such as structure size, yards, density, location, land use, and floodplains, but that statewide authority does not prove that Dewey County adopted any particular rule.9

Ask the Dewey County Auditor for the current ordinance and map, if any, for the exact parcel.3 County rules for setbacks, minimum lot size, minimum dwelling size, building height, lot coverage, subdivisions, accessory dwellings, and manufactured homes could not be confirmed.2 A farmstead and its accessory buildings are excluded from South Dakota's specific default construction-design standard for work commenced after July 1, 2026, but that exclusion does not waive any local zoning, building, occupancy, or other requirement.10

How do septic permits work in Dewey County?

South Dakota DANR administers minimum standards for on-site wastewater systems, and a local government may impose stricter requirements.4 DANR says the state has installation requirements for on-site wastewater systems and answers installation-plan questions at (605) 773-4647.11 Contact DANR before installing a new system unless it is a conventional on-site system serving an individual residence; other systems receiving human waste require plans and specifications, and works of sanitary significance require submission at least 30 days before planned construction.12

Parcel testing deserves attention because only about 3.9% of Dewey County soils are rated without severe limitations for a conventional septic drain field.13 That countywide soil statistic does not decide a particular homesite, so make wastewater feasibility part of the purchase contingency. A general Dewey County septic-inspection requirement could not be confirmed; ask DANR whether the proposed design needs review and ask the County Auditor whether a stricter local step applies.113

Can you live in an RV or tiny home in Dewey County?

A Dewey County rule expressly allowing or prohibiting long-term RV occupancy, temporary camping, or tiny-home occupancy could not be confirmed.2 Do not assume that an unlocated rule means unrestricted use; ask the Dewey County Auditor for the rule applying to the exact parcel, structure, utilities, and length of stay.3 County minimum-home-size, setback, accessory-dwelling, and manufactured-home requirements are also unconfirmed.2

Waste disposal is a separate issue from the dwelling type. South Dakota allows specified unconventional sanitation when water or electricity is unavailable, but systems other than vault privies are treated as experimental and need state approval of plans and specifications before installation.14 A tiny home with plumbing may also trigger the state plumbing certificate and inspection rules outside cities that run their own inspection program.6 Confirm land use and sanitation before placing or occupying the unit.311

Building a home in Dewey County: what are the steps?

  1. Give the Dewey County Auditor the parcel's legal description and ask for the current building, zoning, subdivision, floodplain, and county-road-access requirements.3
  2. Ask South Dakota DANR to confirm the wastewater review path and whether Dewey County adds a stricter local requirement.411
  3. Determine whether the proposed water use needs a state water-right permit; when one is required, approval must come before well drilling.8
  4. Secure the applicable state plumbing certificate and inspections outside a city with its own inspection requirements.6
  5. Obtain the state electrical permit and arrange rough-in and final inspections before wiring is covered and before occupancy.57
  6. If the driveway connects to a state highway, obtain South Dakota Department of Transportation permission before construction.15
  7. If the site lies in a regulated floodplain, identify the local administrator and obtain the required development permit.16

What should you check before buying land in Dewey County?

Start with legal access, jurisdiction, and buildability. Ask the Dewey County Auditor whether the parcel is subject to county or municipal rules and whether county-road access needs approval, because Dewey County's zoning, building-permit, floodplain, and driveway processes could not be confirmed.213 A driveway onto a state highway requires state permission, and construction cannot start until the access permit is issued.15

Evaluate wastewater on the proposed homesite because only about 3.9% of county soils are rated without severe limits for a conventional drain field.13 Confirm the well path before drilling because some water uses require an approved state water-right permit first.8 Check flood maps and the local permit path because participating South Dakota communities require permits for development in regulated floodplains.16 For budgeting context, the median property-tax bill is about $1,009 per year, but parcel taxes depend on assessed value and classification.17

Watch-outs

  • The absence of a published county building-permit or zoning rule is not proof that no rule applies; ask the Dewey County Auditor for a parcel-specific answer.123
  • Only about 3.9% of Dewey County soils are rated without severe limitations for a conventional septic drain field, so verify the actual homesite before buying.13
  • An owner-electrical exemption removes the licensure requirement for qualifying work, but it does not remove the homeowner permit or inspection requirements.7
  • A county floodplain administrator and county-road approach process could not be confirmed; ask the Dewey County Auditor before site work.3

Sources

  1. (2026 county census)
  2. (2026 county census)
  3. Dewey County Auditor (dewey.sdcounties.org)
  4. One-Stop Permitting and Regulation Guide (2025 Edition), quoted and re-checked
  5. South Dakota Electrical Commission - Homeowner Wiring (South Dakota statewide rule), quoted and re-checked
  6. South Dakota Plumbing Commission - Inspections (South Dakota statewide rule), quoted and re-checked
  7. South Dakota Electrical Commission - Homeowner Wiring (South Dakota statewide rule), quoted and re-checked
  8. South Dakota Water Rights - Drilling a Well, quoted and re-checked
  9. 2000 Session Laws Chapter 69 — Planning and zoning statutes revised (South Dakota statewide rule), quoted and re-checked
  10. South Dakota Codified Law Chapter 11-10: Building Codes and Standards (South Dakota statewide rule), quoted and re-checked
  11. South Dakota Department of Agriculture and Natural Resources (danr.sd.gov)
  12. One-Stop Permitting and Regulation Guide (2025 Edition), quoted and re-checked
  13. Share of soils without severe limits for a conventional septic drain field (USDA SSURGO): Bolthole Index county data
  14. Administrative Rule 74:53:01 — Individual and Small On-Site Wastewater Systems (South Dakota statewide rule), quoted and re-checked
  15. Instructions: Applying for permission for driveway or intersection on a South Dakota state highway (South Dakota statewide rule), quoted and re-checked
  16. National Flood Insurance Program (South Dakota statewide rule), quoted and re-checked
  17. Median property tax bill: Bolthole Index county data

Written September 28, 2026 from the rules quoted below, each taken from an official source and re-checked by an independent reviewer. This is research, not legal advice: rules change, so confirm with the office before you buy or build.

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County locator

Dewey County in South Dakota

46
County map
Dewey County highlighted among the South Dakota counties · colored by Index score

How Dewey County scores

Seclusion9180% ev.
Self-Sufficiency16100% ev.
Admin Boringness6445% ev.
Durability38100% ev.
Property Autonomy67100% ev.
Carry Cost83100% ev.

Evidence strength: 86%. This reports direct-source completeness and fallback use; it is separate from the score and is not a confidence interval. How it works →

$75kTypical home
1.3%Property tax
$1,109Land / acre
18.7"Annual rain
14.7% of yrsSevere drought
13 / yr (+9.5)Mid-century 100°F days
22.4 daysMid-century dry spell
1.28" (+7.8%)Mid-century 1-day rain
1.39×Wildfire change factor
100%Forward climate coverage
$1,694Home insurance / yr
1.6% / yrInsurance growth
1.41%Nonrenewal rate
county median (2+ published ZIPs)Insurance basis
144People within 30 min
18,158People within 2 hr
713Radius comparison (15 mi)
2.3People / sq mi
6.8%Federal land
92.2%Land at 15% slope or less
3.9%Septic soil without severe limits
53,869 acWorkable land screen
1.9%Wooded land
10 tonsBiomass / forest ac
45.1°FAvg temp

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Answers from the rulebook for Dewey County

What the ordinances and state agencies actually say — one answer per question, each quoted from the official source and independently re-checked.

South Dakota rules that apply here

  • Owner-builder exemptionAvailable (with conditions)

    An individual owner personally installing electrical wiring and fixtures in a residence or farmstead owned and resided in by that individual.

    • The exemption is from electrical licensure requirements, not from permitting or inspection.
    • An approved homeowner permit must be obtained before electrical work begins.
    • The exemption does not apply to commercial or rental property.
    • Mobile-home and modular-home installations are allowed only when the unit is on an owner-occupied lot at the time of installation; otherwise a licensed South Dakota electrical contractor is required.
    • A final inspection is required before occupancy.
    “an "owner's exemption" as an exemption from licensure requirements”
  • InspectionsRequired

    Plumbing installations in South Dakota outside cities that administer their own plumbing inspection requirements.

    • The exception is for cities with their own inspection requirements.
    • Inspection requests generally require at least 72 hours advance notice, excluding weekends and holidays.
    • Inspections occur after a plumbing installation certificate is secured.

    installation certificate fee: 20 USD · single-family inspection fee: 110 USD · small-structure inspection fee: 100 USD (Five or fewer fixtures.) · large-structure inspection fee: 275 USD (Six or more fixtures.)

    “You must have a plumbing inspection certificate for all plumbing installations.”
    One more reviewed finding on this topic
  • Who permits septicState (with conditions)

    On-site wastewater systems applicable in Dewey County.

    • The state requirements are minimum standards; local governments may impose more stringent regulations.
    • The cited state page identifies SDCL Chapter 34A-2 and ARSD Article 74:53:01 as the governing authority.
    “The authority for regulating on-site wastewater systems is found in SDCL Chapter 34A-2. The regulations are in the ARSD Articles 74:53:01. These regulations are the state’s minimum requirements and standards, but local governments may have more stringent regulations.”
    One more reviewed finding on this topic
    • State — Individual and small on-site wastewater systems statewide in South Dakota.
      “The authority for regulating on-site wastewater systems is found in SDCL Chapter 34A-2.”
  • Septic permitLimited

    New or modified on-site wastewater systems in Dewey County.

    • DANR should be contacted before installation of any new on-site system except a conventional on-site system serving an individual residence.
    • Plans and specifications must be submitted to DANR for installations receiving human excreta other than a conventional individual onsite system.
    • For works of sanitary significance, plans and specifications must be submitted at least 30 days before planned construction.
    • Local governments may impose more stringent requirements.

    plans submission lead time for works of sanitary significance: >= 30 days (The source states this requirement applies to works of sanitary significance.)

    “You should contact DANR prior to the installation of any new on-site system except those conventional on-site systems serving an individual residence. DANR will review information about the on-site system to make sure it complies with the regulations. Plans and specifications must be submitted to DANR for any installation that will receive human excreta other than a conventional individual onsite system, per ARSD 74:53:01:03. For works of sanitary significance, plans and specifications must be submitted at least 30 days prior to the planned commencement of construction, per ARSD 74:53:04:05.”
  • Off-grid sanitationAllowed (with conditions)

    Unconventional off-grid sanitation systems where a water or electrical system is unavailable statewide.

    • Vault privies, chemical toilets, incinerator toilets, or composting units must be used when a water or electrical system is unavailable.
    • Except for vault privies, all unconventional systems are experimental systems and require plans and specifications submitted to the secretary for approval before installation.
    “all unconventional systems are considered experimental systems”
  • Well permitLimited

    Water-well drilling and proposed water uses statewide in South Dakota.

    • A water-right permit is required only for proposed water uses that fall within the permitting requirements; the official page directs applicants to the Using Water in SD page to determine whether a permit is needed.
    • When a water-right permit is required, state law requires approval before well drilling.
    • The chief engineer may permit construction of a test well before obtaining the water-right permit; the test well may serve as the production well if the application is approved.
    • A water-right permit, when required and approved, provides five years to construct the water-use system and an additional four years to place all water to beneficial use.
    • A well driller's license is required before drilling any well or contracting to drill a well.

    construction period after water-right permit approval: 5 years · period to place water to beneficial use: 4 years

    “If a water right permit is needed, state law requires the permit to be approved prior to doing any well drilling.”
    One more reviewed finding on this topic
    • Limited — Water wells and associated water use in Dewey County.
      “Your proposed water use may require obtaining a water right permit. In order to determine whether you need a permit, please refer to the Using Water in SD web page. If a water right permit is needed, state law requires the permit to be approved prior to doing any well drilling. [...] However, you may seek permission from the chief engineer of the Water Rights Program to have a test well constructed prior to obtaining a water right permit.”
  • Agricultural exemptionAvailable (with conditions)

    Farmsteads and accessory structures or buildings thereto under South Dakota's default construction-design standard when the local unit of government has not adopted an ordinance prescribing standards under SDCL 11-10-5.

    • The default standard applies to building work commenced after July 1, 2026.
    • The local unit of government may adopt an ordinance allowing local administration and enforcement of the design standard.
    • The exclusion is from SDCL 11-10-6's default 2024 International Building Code design standard; it does not establish that all local zoning, building, occupancy, or other requirements are waived.
    • The statute defines farmstead as a farm or ranch, including any structure or building located on the land.
    • Residential structures and mobile or manufactured homes are also excluded from this specific default-standard provision.

    construction commencement date: > 2026-07-01 (The provision applies to buildings commenced after July 1, 2026.) · building standard: 2024 International Building Code (The default standard does not apply to a farmstead or accessory structure or building thereto.)

    “farmstead and any accessory structure or building thereto.”
  • Driveway accessLimited

    New or modified driveways and intersections connecting to South Dakota state highways.

    • Permission from the South Dakota Department of Transportation is required for access to a state highway.
    • The application may require an access approach design, vicinity map, estimated traffic volumes, three copies of a site plan, traffic-control plan, liability insurance, development plan, drainage plan, traffic-impact study, and revegetation plan.
    • Construction cannot begin until the access permit is issued.
    • The permittee pays construction, maintenance, and removal costs.
    • The permit expires if access is not under construction within one year, subject to one written one-year extension.
    • Access construction must be completed within 45 days after initiation within the highway right-of-way.

    application review update threshold: 30 days (If the application is not completed within 30 days, a Department employee will contact the applicant with an update.) · construction completion period: 45 days (Measured from initiation of construction within the highway right-of-way.)

    “Construction of the access shall not proceed until the access permit is issued. The access shall be completed in an expeditious and safe manner and shall be finished within 45 days from the initiation of construction within the highway right-of-way.”
  • Building in a floodplainRequired

    Development in floodplains within South Dakota communities participating in the National Flood Insurance Program, including incorporated and unincorporated areas administered separately by local governments.

    • Participating communities must adopt and enforce a flood-damage-prevention ordinance.
    • Permits are required for all types of development in the floodplain.
    • New or substantially improved homes and manufactured homes must be elevated above the Base Flood Elevation.
    • Non-residential buildings must be elevated or flood-proofed.
    • Elevation Certificates are required to document compliance.
    • NFIP participation and eligibility are established separately for incorporated and unincorporated areas; the source does not establish a single uniform permit process for every South Dakota location.
    “Require permits for all types of development in the floodplain.”
  • Permit feesPublished (with conditions)

    South Dakota state electrical wiring permits, including residential and farmstead wiring subject to state administration.

    • A wiring permit is required for electrical service entrances over 60 amperes, owner-exemption wiring, and other installations with an estimated inspection fee of at least $30.
    • Local inspection systems may have their own procedures, inspection fees, and regulations.
    • Inspection fees are separate from the $20 wiring-permit fee.

    wiring permit fee: 20 USD · permit validity: 3 years (A new permit is required if the installation extends beyond three years.) · late permit administrative fee: 250 USD (Applies when the permit is not dated at job start or is not renewed before expiration.)

    “A wiring permit may be obtained for twenty dollars from the commission office. A wiring permit is valid for three years from the date the permit is issued.”
  • Permit processPublished (with conditions)

    South Dakota state electrical wiring permits and inspections.

    • The installer must send the white permit copy to the Commission within 15 calendar days after starting the installation.
    • The permit hard copy must be posted at the job site when electrical work starts.
    • At least 72 hours' notice is required before inspection.
    • A rough-in inspection must occur before wiring is covered, and a final inspection is required before occupancy.
    • Homeowner permits are limited to qualifying owner-occupied residences or farmsteads and cannot be used for commercial or rental property.

    white permit copy submission deadline: 15 calendar days after starting installation · inspection notice: >= 72 hours

    “Within fifteen calendar days after starting an electrical installation, the installer shall send the white copy to the office of the commission.”
  • county zoning authorityGeneral

    South Dakota county boards' authority to adopt zoning ordinances, including for unincorporated county land.

    • The authority is granted for promoting the health, safety, or general welfare of the county.
    • The statute authorizes regulation of building and land-use characteristics including height, number of stories, building and structure size, lot coverage, yards, courts, open spaces, population density, and locations and uses of buildings, structures, and land.
    • The authorized purposes expressly include trade, industry, residence, flood plain, and other purposes.
    • This claim identifies statewide enabling authority; whether a particular county has adopted an ordinance is a separate local question.
    “For the purpose of promoting health, safety, or the general welfare of the county the board may adopt a zoning ordinance to regulate and restrict the height, number of stories, and size of buildings and other structures, the percentage of lot that may be occupied, the size of the yards, courts, and other open spaces, the density of population, and the location and use of buildings, structures, and land for trade, industry, residence, flood plain, or other purposes.”

Still unanswered

We looked and could not find an official answer yet. Silence is not permission — ask the county directly.

  • Building permit — Building permits for construction in Dewey County.
  • Building code adopted — Building-code adoption in Dewey County.
  • Certificate of occupancy — Certificates of occupancy in Dewey County.
  • County-wide zoning — Countywide zoning in Dewey County, including unincorporated areas.
  • Local zoning — Local zoning in Dewey County, including incorporated and unincorporated areas.
15 more unanswered
  • Zoning districts
  • Minimum dwelling size
  • Minimum lot size
  • Setbacks
  • Lot coverage
  • Building height
  • Living in an RV
  • Camping on your land
  • Tiny homes
  • Manufactured homes
  • Accessory dwellings
  • Septic inspection
  • Mandatory utility hookup
  • Subdividing land
  • Short-term rentals

Each answer was extracted from an official source and independently re-checked against that source by a second reviewer. That is an evidence check, not legal advice. Rules change; confirm with the authority before you buy or build.

Living off-grid in Dewey County, South Dakota

Is Dewey County a good place to live off-grid or homestead?

Dewey County scores 46/100 on the Bolthole Index, a marginal county profile. Its strengths: deep seclusion — about 144 people within a 30-minute drive and manageable long-term carry cost. Watch-outs: thin water margin (18.7″/yr rainfall) and elevated current hazard exposure.

Do you need a building permit in Dewey County, South Dakota?

Building-permit rules for unincorporated Dewey County are not published on an official source. Onsite septic is permitted by South Dakota Department of Agriculture & Natural Resources (DANR). Owner-builders may act as their own contractor to build their home. These answers are quoted from official sources and independently re-checked. Rules change and cities within the county differ — always confirm with the county before you buy or build.

How much does land cost in Dewey County, South Dakota?

Land in Dewey County runs about $1,109 per acre, based on the latest county data.

What is the water situation in Dewey County?

Dewey County gets about 18.7" of rain a year, with severe drought in roughly 14.7% of years.

How remote is Dewey County?

A representative private-land location has about 144 people within a 30-minute drive and 18,158 within two hours. The road-network catchments count population across county lines and clusters of smaller cities; straight-line radius values remain available as a comparison.

Off-grid gear

Going off-grid in Dewey County means bringing your own water and power. The kit we’d start with:

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How Dewey compares in South Dakota

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