Bolthole Index

Clay County, South Dakota

Building permits, zoning and septic rules in Clay County, South Dakota

50Index Score / 100
#23 of 66 in South Dakota

Unincorporated Clay County, South Dakota requires a county building permit, and its zoning ordinance applies outside approved municipal joint-zoning areas12. County Planning & Zoning publishes the applications and fee schedule3. South Dakota administers minimum onsite-wastewater standards, but the exact review for a proposed residential system depends on its design4.

At a glance

Building permit
Required through Clay County Planning & Zoning for unincorporated county projects13
Zoning
Yes; the county ordinance covers unincorporated land outside approved municipal joint-zoning areas2
Permit fee
$75 plus $2 per $1,000 of estimated cost5
Septic
South Dakota sets minimum standards; confirm the proposed system's review path with DANR46
RV living
A general private-land occupancy rule could not be confirmed; ask County Planning & Zoning3
Tiny home
No tiny-home-specific occupancy rule was confirmed; zoning and the county permit process still apply21
Owner-builder
Qualifying resident owners may do their own electrical work, but need a homeowner permit and inspections7
Minimum lot
Varies by district; listed residential and agricultural minimums range from 1 to 2 acres8

Who to call

Planning & zoning

Clay County Planning & Zoning

County planning and zoning, building-permit applications, land-use applications and floodplain information

(605) 677-7145

[email protected]

211 W Main St, Suite 205, Vermillion, SD 57069

Septic permits

South Dakota Department of Agriculture and Natural Resources

State onsite-wastewater installation requirements and review of systems that require submitted plans

(605) 773-4647

[email protected]

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 27, 2026.

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

Yes. Unincorporated Clay County requires a building permit, and County Planning & Zoning provides a new-home permit application13. The published county fee is $75 plus $2 per $1,000 of estimated project cost5. A permit may expire if work has not begun within 90 days or has not been substantially completed within 1 year after issuance9. Clay County's current countywide building-code adoption and certificate-of-occupancy requirement could not be confirmed; ask County Planning & Zoning what construction standards and closeout steps apply to the specific project3. State electrical and plumbing processes remain separate: qualifying electrical work receives state inspections, and plumbing installations outside cities with their own inspection systems require a state inspection certificate1011.

Who issues building permits in Clay County, and how do you reach them?

Clay County Planning & Zoning is the first stop for a building permit on unincorporated land3. Reach the office at (605) 677-7145 or [email protected], or visit 211 W Main St, Suite 205, Vermillion, SD 570693. The office page provides the new-home building permit, general building-permit application, conditional-use application, rezone petition, plat checklist and county zoning materials3. The correct approval path depends on the request and may involve the Zoning Administrator, Planning Commission, Board of Adjustment or County Commission9. Before preparing plans, ask the office to identify the parcel's zoning district, confirm whether it lies in a municipal joint-zoning area, and list every land-use approval required for the proposed work23.

Does Clay County have zoning for setbacks, RVs and tiny homes?

Yes. Clay County zoning applies to all unincorporated land except areas approved for municipal joint zoning jurisdiction2. Minimum lot area and setbacks vary by district: the listed minimum lot area is 2 acres in NRC and A-1, and 1 acre in RR8. Listed front, side and rear yards are 50/30/75 feet in NRC, 75/30/50 feet in A-1 and 30/10/30 feet in RR12. Agricultural-district residences also depend on building eligibility and conditions that include public-road access approval and a Right to Farm Covenant before permit issuance13. Clay County-specific rules for full-time RV living, tiny-home occupancy, accessory dwellings and minimum dwelling floor area could not be confirmed; ask County Planning & Zoning about the exact parcel, zoning district and proposed use3.

How do septic permits work in Clay County?

South Dakota DANR administers the state's minimum onsite-wastewater requirements, while local governments may impose stricter requirements4. State guidance calls for DANR contact before a new onsite system except a conventional system serving an individual residence, but we could not confirm one general permit rule for every Clay County residential system4. Call DANR at (605) 773-4647 and ask Clay County Planning & Zoning whether local review also applies to the parcel63. Soil feasibility is a major purchase-stage question: only about 6.3% of Clay County soils are rated without severe limitations for a conventional septic drain field, so obtain a site evaluation before treating a conventional layout as assured14. Where water or electricity is unavailable, South Dakota allows specified unconventional sanitation systems, but systems other than vault privies are experimental and require plans and specifications submitted for approval before installation15.

Can you live in an RV or tiny home on your land in Clay County?

A general Clay County rule allowing or prohibiting full-time RV occupancy on private land could not be confirmed. Clay County does regulate designated multi-site campgrounds, including Planning Commission review of whether electrical, water and sewer facilities are adequate for the RVs or tents served16. That campground provision does not answer whether a person may occupy one RV on a private parcel, so ask County Planning & Zoning for a parcel-specific determination3. A tiny-home-specific occupancy rule and numeric minimum dwelling size also could not be confirmed. A tiny home proposed as a residence still faces the county's building-permit process, zoning district, setbacks and any applicable building-eligibility requirement11213. Manufactured homes have their own conditions, including ordinance compliance and building eligibility where the district requires it17.

Building a home in Clay County: the steps, in order

  1. Confirm with Clay County Planning & Zoning whether the parcel is in ordinary unincorporated county zoning or an approved municipal joint-zoning area23.
  2. Verify the zoning district, permitted residential use, building eligibility, lot size and setbacks before commissioning final plans81213.
  3. Evaluate septic and water feasibility; DANR administers minimum onsite-wastewater standards, and a state water-right permit may be required before well drilling depending on the proposed use418.
  4. Obtain a floodplain development permit if the site lies in an area of special flood hazard19.
  5. Submit the county building-permit application and applicable fee through Planning & Zoning35.
  6. Arrange separate state electrical and plumbing permits or inspections that apply to the work2011.
  7. Secure South Dakota DOT permission before constructing access to a state highway21.

What should you check before buying land in Clay County?

Start with jurisdiction because approved municipal joint-zoning areas do not follow the ordinary county zoning ordinance2. Confirm the district, residential building eligibility, minimum lot area and setbacks with Clay County Planning & Zoning before relying on an advertised use138123. Review flood maps because development in a special flood-hazard area requires floodplain permit review19. Test septic feasibility early because only about 6.3% of county soils are rated without severe limits for conventional drain fields14. Confirm legal road access, and obtain state permission before constructing an approach to a South Dakota highway21. For carrying costs, Clay County's median property-tax bill is about $2,879 per year and its effective property-tax rate is about 1.3%2223.

Watch-outs

  • A Clay County permit may expire if work does not begin within 90 days or is not substantially complete within 1 year after issuance9.
  • An A-1 home site is not automatically buildable merely because it meets the 2-acre minimum; building eligibility, access approval and covenant conditions also apply13.
  • Access onto a South Dakota state highway needs state permission before construction begins21.

Sources

  1. Clay County SD - Zoning (County) (2026 county census)
  2. Clay County Zoning Ordinance, updated through Ordinance No. 2024-04, quoted and re-checked
  3. Clay County Planning & Zoning (claycountysd.org)
  4. On-Site Wastewater Systems in South Dakota (South Dakota statewide rule), quoted and re-checked
  5. Clay County, South Dakota - Zoning - County, quoted and re-checked
  6. South Dakota Department of Agriculture and Natural Resources (danr.sd.gov)
  7. South Dakota Electrical Commission - Homeowner Wiring (South Dakota statewide rule), quoted and re-checked
  8. Clay County Building Permit, quoted and re-checked
  9. Clay County Zoning Ordinance, updated through Ordinance No. 2024-04, quoted and re-checked
  10. South Dakota Electrical Commission - Homeowner Wiring (South Dakota statewide rule), quoted and re-checked
  11. South Dakota Plumbing Commission - Inspections (South Dakota statewide rule), quoted and re-checked
  12. Clay County Building Permit, quoted and re-checked
  13. Clay County Zoning Ordinance, updated through Ordinance No. 2024-04, quoted and re-checked
  14. Share of soils without severe limits for a conventional septic drain field (USDA SSURGO): Bolthole Index county data
  15. Administrative Rule 74:53:01 — Individual and Small On-Site Wastewater Systems (South Dakota statewide rule), quoted and re-checked
  16. Clay County Zoning Ordinance, updated through Ordinance No. 2024-04, quoted and re-checked
  17. Clay County Zoning Ordinance, updated through Ordinance No. 2024-04, quoted and re-checked
  18. South Dakota Water Rights — Drilling a Well (South Dakota statewide rule), quoted and re-checked
  19. Ordinance 2021-01 Flood Damage Prevention, quoted and re-checked
  20. South Dakota Electrical Wiring Rules Bulletin (South Dakota statewide rule), quoted and re-checked
  21. Instructions: Applying for permission for driveway or intersection on a South Dakota state highway (South Dakota statewide rule), quoted and re-checked
  22. Median property tax bill: Bolthole Index county data
  23. Effective property tax rate: Bolthole Index county data

Written September 27, 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

Clay County in South Dakota

50
County map
Clay County highlighted among the South Dakota counties · colored by Index score

How Clay County scores

Seclusion47100% ev.
Self-Sufficiency29100% ev.
Admin Boringness49100% ev.
Durability47100% ev.
Property Autonomy67100% ev.
Carry Cost68100% ev.

Evidence strength: 100%. This reports direct-source completeness and fallback use; it is separate from the score and is not a confidence interval. How it works →

$292kTypical home
1.3%Property tax
$7,445Land / acre
28"Annual rain
18.6% of yrsSevere drought
12.3 / yr (+10.3)Mid-century 100°F days
21.7 daysMid-century dry spell
1.55" (+8.8%)Mid-century 1-day rain
1.59×Wildfire change factor
100%Forward climate coverage
$2,010Home insurance / yr
4% / yrInsurance growth
0.77%Nonrenewal rate
county median (2+ published ZIPs)Insurance basis
39,394People within 30 min
934,345People within 2 hr
18,704Radius comparison (15 mi)
37.5People / sq mi
0.6%Federal land
98.2%Land at 15% slope or less
6.3%Septic soil without severe limits
16,427 acWorkable land screen
2.1%Wooded land
61.8 tonsBiomass / forest ac
47.8°FAvg temp

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Answers from the rulebook for Clay County

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

Clay County rules

  • County-wide zoningPresent

    County zoning on unincorporated land, excluding areas approved for municipal joint zoning jurisdiction.

    • The ordinance applies to all unincorporated land within Clay County except areas approved for municipal joint zoning jurisdiction.
    “The regulations and zoning district boundaries set forth in this Ordinance shall apply to all unincorporated land within Clay County except those areas which have been approved for municipal joint zoning jurisdiction.”
  • Minimum lot sizeSpecified

    County zoning districts in unincorporated Clay County.

    • The applicable minimum varies by district and use.

    NRC lot area: >= 2 acres · A-1 lot area: >= 2 acres · RR lot area: >= 1 acre · L-1 and I-2 lot area: >= 10000 square feet

    “NRC 2 Acres 200 Feet 50 Feet 30 Feet 75 Feet A1 Agricultural 2 Acres 200 Feet 75 Feet 30 Feet 50 Feet RR: Rural Residential 1 Acre 125 Feet 30 Feet 10 Feet 30 Feet”
  • SetbacksSpecified

    Building setbacks in county zoning districts.

    • The applicable setback varies by zoning district and use.

    NRC front/side/rear yards: 50/30/75 feet · A-1 front/side/rear yards: 75/30/50 feet · RR front/side/rear yards: 30/10/30 feet

    “County ZO Lot Area Lot Width Front Yard Side Yard Rear Yard”
  • Building heightSpecified

    Building height in county zoning districts.

    • The ordinance states that maximum height is none in the listed district table, subject to the Vermillion-Clay Airport Zoning Ordinance where applicable.
    “All Uses 2 acres 200 feet 50 feet 30 feet 75 feet None*”
  • Manufactured homesLimited

    Mobile/manufactured-home occupancy in county zoning districts.

    • A mobile/manufactured home must conform to Section 3.10.
    • A building eligibility must exist on the parcel where required by the district regulations.
    • Applicable district lot, yard, and other zoning rules continue to apply.
    “Mobile home/manufactured home in conformance with Section 3.10 and a building eligibility shall exist on the parcel”
  • Mandatory utility hookupConditional

    Designated campgrounds with more than four campsites.

    • Accessory buildings and electrical, water, and sewer facilities must be adequate for the recreational vehicles or tent camps served.
    • Adequacy is reviewed by the Planning Commission at the conditional-use hearing.
    “Accessory buildings, electrical, water, and sewer facilities shall be designed to provide services adequate for the type of recreational vehicles and/or tent camps to be served.”
  • Agricultural exemptionConditional

    Agricultural uses and agricultural district residences in unincorporated Clay County.

    • Agriculture is a permitted use in the A-1 Agricultural District.
    • A single-family dwelling requires building-eligibility conditions, including a minimum two-acre lot, public-road access approval, retention of the remaining quarter-quarter section as agricultural land or present use, and a Right to Farm Covenant before permit issuance.

    minimum lot area: >= 2 acres

    “A single-family dwelling if the following provisions for building eligibility are met:”
  • Subdividing landRegulated (with conditions)

    Subdivision development in Clay County.

    • Proposed subdivision development plans require concept, preliminary, and final-plan/plat steps, except qualifying minor plats.
    • Final plan and plat approval occurs before a building permit is approved.

    minor plat maximum lots: <= 3 lots (A minor plat must also meet all listed requirements.) · subdivision ordinance effective date: 2014-10-16

    “Proposed subdivision development plans must be approved by the County in accordance with the following procedures which include three principal steps.”
  • Building in a floodplainRequired

    Development in areas of special flood hazard under Clay County's flood-damage-prevention ordinance.

    • The Floodplain Administrator reviews, approves, or denies development permits required by the ordinance.
    • The administrator must verify that necessary federal, state, or local permits have been obtained where prior approval is required.
    “Review, approve or deny all applications for development permits required by adoption of this Ordinance.”
  • Permit feesPublished

    County planning and zoning permit applications.

    • The county zoning page labels the schedule as an updated 2026 price chart.

    building permit base fee: 75 USD (plus $2 per $1,000 of estimated cost) · CUP fee: 200 USD · variance application fee: 100 USD · rezone/amendment petition fee: 250 USD · board of adjustment appeal fee: 100 USD · plat application fee: 100 USD

    “Building Permit $75 plus $2 per $1000 CUP $200 Variance Application $100 Rezone/Amendment petition $250 Board of adjustment Appeal $100 Plat application $100”
  • Permit processPublished (with conditions)

    County building, moving, demolition, rezoning, conditional-use, variance, and plat processes.

    • Applications are submitted to or processed by the Zoning Administrator, Planning Commission, Board of Adjustment, or County Commission depending on the request.
    • Permits may expire if work has not begun within 90 days or is not substantially completed within one year of issuance.

    permit commencement deadline: 90 days · permit substantial-completion deadline: 1 year

    “If the work described in any permit has not begun within ninety days or been substantially completed within one year of the date of issuance, said permits shall expire.”
  • Building permitRequired

    Clay County's Planning & Zoning office issues building permits (fee '$75 plus $2 per $1000') and provides a New Home building permit application.

    Clay County SD - Zoning (County) ↗Scouted from the county site, not yet 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

    Individual and small on-site wastewater systems statewide in South Dakota.

    • The South Dakota Department of Agriculture and Natural Resources secretary or authorized representative administers the state on-site wastewater requirements.
    • The state rules are minimum requirements; local governments may impose more stringent requirements, according to the DANR permitting guide.
    “The authority for regulating on-site wastewater systems is found in SDCL Chapter 34A-2.”
  • 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.”
  • 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.”
  • 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 code adopted — Countywide building-code adoption.
  • Certificate of occupancy — Certificates of occupancy in Clay County.
  • Minimum dwelling size — Minimum dwelling size in unincorporated Clay County.
  • Lot coverage — Lot coverage in unincorporated Clay County.
  • Tiny homes — Tiny-home occupancy in unincorporated Clay County.
4 more unanswered
  • Accessory dwellings
  • Septic permit
  • Septic inspection
  • 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 Clay County, South Dakota

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

Clay County scores 50/100 on the Bolthole Index, a solid county profile. Its strengths: manageable long-term carry cost and a stronger property-autonomy legal backdrop. Watch-outs: workable self-sufficiency basics (28″/yr rainfall).

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

Clay County generally requires a residential building permit, and it enforces county zoning. Onsite septic is permitted by South Dakota Department of Agriculture and 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 Clay County, South Dakota?

Land in Clay County runs about $7,445 per acre, based on the latest county data.

What is the water situation in Clay County?

Clay County gets about 28" of rain a year, with severe drought in roughly 18.6% of years.

How remote is Clay County?

A representative private-land location has about 39,394 people within a 30-minute drive and 934,345 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 Clay County means bringing your own water and power. The kit we’d start with:

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How Clay compares in South Dakota

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