Buffalo County, SD Building Permits, Zoning & Septic Rules

Unincorporated Buffalo County, South Dakota has no county building or zoning department, and its own published list of county offices shows no building-permit program for homes¹. South Dakota's new default construction standard, the 2024 International Building Code, only reaches places without their own building-code ordinance, and it specifically excludes single-family homes, manufactured homes and farmsteads². Septic systems go through the state, not the county: South Dakota's Department of Agriculture and Natural Resources sets the design rules for on-site wastewater systems here³.

At a glance

Building permit: Not required for homes; Buffalo County has no building department¹
Zoning: No countywide zoning ordinance found⁴
Septic: State-administered by South Dakota DANR, not the county³
New state building standard: 2024 IBC default applies only where no local ordinance exists, and excludes homes, manufactured homes and farmsteads²
Owner-builder electrical: Homeowner wiring exemption available; a permit and inspections are still required⁵
Off-grid sanitation: Vault privies, chemical or composting toilets allowed without water/electric service; cesspools and pit privies are prohibited⁶⁷
Well water: Domestic use up to 25,920 gallons per day generally needs no state water-right permit⁸

Who to call

Also useful

Buffalo County Auditor

County records, commission meeting scheduling and agendas, the county budget, and the general point of contact for Buffalo County government; also serves as Register of Deeds

605-293-3217

Roads & driveways

Buffalo County Highway Department

County road maintenance; the office to contact about access to or condition of a county road

(605) 293-3263

Septic permits

South Dakota DANR On-Site Wastewater Systems Program

Statewide septic tank / on-site wastewater system design requirements, plan review and installer certification that apply to Buffalo County, which has no county health or septic department of its own

(605) 773-4647

Contact details are copied from each office’s official page and were checked against it on September 24, 2026.

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

Unincorporated Buffalo County has no county building or inspection department, and the county's own list of offices names no such program¹. South Dakota's counties also don't automatically fall under a state building code: a new default standard took effect statewide in July 2026 for any local government that hasn't adopted its own building-code ordinance, requiring construction to follow the 2024 International Building Code². That default standard specifically excludes residential structures, mobile and manufactured homes, and farmsteads and their accessory buildings². In practice, that means a house, barn, or farm building in unincorporated Buffalo County isn't required to meet the state's default building code, and no county permit process was found for one either¹. Our research couldn't rule out that Buffalo County has adopted a building-permit requirement that simply isn't posted online, so confirm with the County Auditor's office before you break ground⁹.

Who handles building and zoning questions in Buffalo County, and how do you reach them?

Buffalo County doesn't list a building, planning, or zoning office among its county departments⁴. The closest thing to a general point of contact is the Buffalo County Auditor, who keeps county records, schedules commission meetings, and prepares the county budget⁹. Reach the Auditor's office at 605-293-3217⁹. For anything involving a county road — access, culverts, or maintenance — the Buffalo County Highway Department is the office to call, at (605) 293-3263¹⁰. Because Buffalo County has no separate building or zoning staff, both the Auditor's office and the county commissioners, who meet regularly and post agendas online, are the right places to ask whether any new local ordinance affects your build⁹.

Does Buffalo County have zoning?

No countywide zoning ordinance was found for Buffalo County, based on the county's official pages and its own list of departments, which includes no planning and zoning office⁴. South Dakota law lets county commissions adopt a zoning ordinance covering building height, lot coverage, setbacks, population density, and land use in unincorporated areas¹¹, but whether Buffalo County's commissioners have exercised that power isn't established from what's posted online. Because no confirmed ordinance exists, this guide can't give you a specific setback, minimum lot size, or minimum home size for unincorporated Buffalo County — and it would be wrong to call the county unrestricted. Ask the Buffalo County Auditor's office directly before you plan setbacks, a lot split, or a manufactured-home placement⁹.

How do septic permits work in Buffalo County?

Buffalo County has no county health or septic department; on-site wastewater systems are permitted and regulated statewide by the South Dakota Department of Agriculture and Natural Resources (DANR)³. DANR's design rules are set out in Administrative Rule 74:53, and the secretary or an authorized representative may inspect a system at any time after installation¹². Cesspools and pit privies are prohibited statewide unless they were built before February 28, 1975⁷. If a public sewer line is within 400 feet of your property and a municipality or sanitary district will serve it, state rule requires connecting to that sewer instead of installing a septic system — a scenario more likely near Gann Valley than on open ranch land¹³. About 25% of South Dakota residents rely on septic systems statewide, and DANR's on-site wastewater program can be reached at (605) 773-4647 for plan review and installation requirements¹⁴.

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

No official Buffalo County rule on long-term RV occupancy, temporary camping, or tiny-home occupancy was found on the county's own pages⁴. Because no zoning ordinance or building department has been confirmed for Buffalo County, this guide can't tell you an RV or tiny home is allowed as a residence here, and it can't tell you it's prohibited either — that's simply unconfirmed⁴. Statewide rules about licensed campgrounds and RV parks don't answer whether you can live in your own RV on your own land, so don't rely on those. Before you set up a tiny home, RV, or manufactured home as your residence, call the Buffalo County Auditor's office to ask whether the county commissioners have adopted any rule since this research was completed⁹.

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

Call the Buffalo County Auditor's office (605-293-3217) to confirm there is still no county building-permit or zoning requirement for your project⁹.
If you're installing a septic system, get your design approved through South Dakota DANR's on-site wastewater program before you dig, since the county has no septic office of its own¹⁴³.
If you're drilling a well, know that domestic use up to 25,920 gallons per day or a peak rate of 25 gallons per minute generally doesn't need a state water-right permit, though you still need a licensed well driller⁸.
If you plan to do your own electrical work in a home you own and live in, get the $20 homeowner wiring permit before starting, and schedule the required rough-in and final inspections with at least 72 hours' notice¹⁵¹⁶.
Any plumbing installation needs a $20 installation certificate plus an inspection that runs $100 for five or fewer fixtures and $275 for six or more¹⁷.
If your driveway will connect to a state highway, get a South Dakota DOT access permit before construction starts, and finish the approach within 45 days of starting¹⁸.
If you'll disturb an acre or more of ground — a large pad, pond, or access road — budget for the state's construction stormwater fee, which runs from $100 up to $750 depending on acreage¹⁹.

What to check before you buy land in Buffalo County

Before you buy, ask what's under the surface: only 21.4% of Buffalo County's soils are rated without severe limits for a conventional septic drain field, so many parcels will need a mound system, aerobic treatment unit, or other engineered design rather than a standard gravity system²⁰. Check whether a driveway would connect to a state highway, since that requires a South Dakota DOT access permit before construction and a 45-day window to finish the approach¹⁸. If any part of the parcel sits in a mapped floodplain, expect a local permit, an elevation requirement above the Base Flood Elevation, and an Elevation Certificate in a participating community — though whether Buffalo County's unincorporated area currently participates in the National Flood Insurance Program isn't confirmed from official pages²¹. On taxes, Buffalo County's effective property tax rate runs about 0.8%, with a median annual bill of $843²²²³. The county is sparsely populated, about 4 people per square mile across roughly 1,884 residents, and sits 127 miles from the nearest metro area, so plan for long drives to services and mail-in or phone dealings with state offices²⁴²⁵²⁶.

Watch-outs

Buffalo County's official office list does not include a building, planning, or zoning department, and no countywide zoning ordinance was confirmed — call the County Auditor's office to check nothing has changed before you rely on that⁹⁴.
Whether Buffalo County's unincorporated area participates in the National Flood Insurance Program, and who would administer floodplain permits locally, could not be confirmed from official pages — ask the County Auditor's office before building near a drainage or the Missouri River⁹²¹.
No official rule on living in an RV or tiny home on private land in Buffalo County was found — confirm current practice with the County Auditor's office before moving one onto your land as a residence⁹⁴.

Sources

Written September 24, 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.

How Buffalo County scores

Seclusion90100% ev.

Self-Sufficiency1392% ev.

Admin Boringness81100% ev.

Durability39100% ev.

Property Autonomy67100% ev.

Carry Cost8394% ev.

Evidence strength: 98%. This reports direct-source completeness and fallback use; it is separate from the score and is not a confidence interval. How it works →

$108kTypical home

0.8%Property tax

$1,941Land / acre

22.1"Annual rain

10.6% of yrsSevere drought

15.6 / yr (+11.5)Mid-century 100°F days

23.4 daysMid-century dry spell

1.21" (+4.4%)Mid-century 1-day rain

1.46×Wildfire change factor

100%Forward climate coverage

state median fallbackInsurance basis

64People within 30 min

100,717People within 2 hr

700Radius comparison (15 mi)

4People / sq mi

15%Federal land

96%Land at 15% slope or less

21.4%Septic soil without severe limits

62,482 acWorkable land screen

1.6%Wooded land

46.3°FAvg temp

Answers from the rulebook for Buffalo County

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

Buffalo County rules

Building permitNot required
Buffalo County's official county-offices listing shows no building/inspection or planning office, and building codes/permits are local-option in South Dakota; no county residential building-permit program is administered for this very rural county (Gann Valley).
Buffalo County, South Dakota - County Offices ↗Scouted from the county site, not yet independently re-checked
County-wide zoningAbsent
Buffalo County's official department list includes no planning and zoning office, and no countywide zoning ordinance was found; zoning is a local-option power in South Dakota.
Buffalo County, South Dakota - County Offices ↗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”
South Dakota Electrical Commission - Homeowner Wiring ↗Re-checked Sep 12, 2026
Building code adoptedPartial
Buildings commenced after July 1, 2026, within any South Dakota local unit of government that has not adopted an ordinance prescribing standards under South Dakota Codified Law § 11-10-5.
- The design standard must be based on the 2024 International Building Code.
- A local unit of government may adopt an ordinance allowing local administration and enforcement.
- The provision does not apply to residential structures, mobile or manufactured homes, farmsteads, or accessory structures or buildings thereto.
- A nonresidential mobile or manufactured home used for nonresidential purposes is also excluded when constructed to applicable prevailing HUD standards and compliant with applicable accessibility standards.
- Specialty resorts or vacation home establishments constructed in compliance with Group R-3 of the 2024 International Building Code are excluded.
construction commencement date: > 2026-07-01 (The rule applies to buildings commenced after this date.) · building standard: 2024 International Building Code
“any building commenced after July 1, 2026 [...] must be based on the 2024 edition of the International Building Code”
SDLRC - Codified Law 11-10-6 - New construction standards--No building code ordinance--International Building Code applied--Exclusions ↗Re-checked Sep 10, 2026
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.”
South Dakota Plumbing Commission - Inspections ↗Re-checked Sep 12, 2026
One more reviewed finding on this topic
- Limited — Electrical wiring installations subject to South Dakota Electrical Commission inspection.
  “A final inspection is required for all jobs prior to occupancy.”
  South Dakota Electrical Commission - Homeowner Wiring ↗Re-checked Sep 12, 2026
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.”
On-Site Wastewater Systems in South Dakota ↗Re-checked Sep 12, 2026
Septic inspectionLimited
Installation, equipment, and operation of on-site wastewater systems in Buffalo County.
- Inspection authority is discretionary rather than stated as a periodic inspection schedule; the secretary or authorized representative may inspect at any time.
“may be made at any time”
Rule 74:53 Water Supply and Treatment Systems ↗Re-checked Sep 10, 2026
Off-grid sanitationProhibited
Construction or post-February 28, 1975 operation of cesspools and pit privies in Buffalo County.
- The rule prohibits construction of cesspools and pit privies.
- Operation of a cesspool or pit privy constructed after February 28, 1975 is prohibited.
cutoff date: February 28, 1975
“Cesspools and pit privies prohibited.”
Rule 74:53 Water Supply and Treatment Systems ↗Re-checked Sep 10, 2026
One more reviewed finding on this topic
- Allowed (with conditions) — Unconventional off-grid sanitation systems where a water or electrical system is unavailable statewide.
  “all unconventional systems are considered experimental systems”
  Administrative Rule 74:53:01 — Individual and Small On-Site Wastewater Systems ↗Re-checked Sep 12, 2026
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.”
South Dakota Water Rights — Drilling a Well ↗Re-checked Sep 12, 2026
One more reviewed finding on this topic
- Limited — Private well water use and well drilling in Buffalo County.
  “domestic use of water requires a permit if your water use exceeds either 25,920 gallons per day”
  Using Water in South Dakota ↗Re-checked Sep 10, 2026
Mandatory utility hookupSewer (with conditions)
Use of an on-site wastewater system versus connection to a public wastewater system in Buffalo County.
- An on-site wastewater system may not be constructed, installed, or operated when a public wastewater system is available.
- Availability requires the premises to be within a municipality or sanitary district, the public sewer collection system to be within 400 feet, and the municipality or sanitary district to request service.
public sewer distance: <= 400 feet (The rule also requires municipal or sanitary-district jurisdiction and a request to provide service.)
“within 400 feet”
Rule 74:53 Water Supply and Treatment Systems ↗Re-checked Sep 10, 2026
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.”
South Dakota Codified Law Chapter 11-10: Building Codes and Standards ↗Re-checked Sep 12, 2026
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.”
Instructions: Applying for permission for driveway or intersection on a South Dakota state highway ↗Re-checked Sep 12, 2026
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.”
National Flood Insurance Program ↗Re-checked Sep 12, 2026
Permit feesPublished (with conditions)
Construction activities in South Dakota, including residential, commercial, industrial, road, and access-road construction, that disturb one or more acres or are part of a larger common plan of development.
- Coverage under the General Permit is required when the applicable acreage threshold is met.
- The first year's stormwater fee must accompany the Notice of Intent.
- A 2.5% credit-card charge or 0.75% eCheck charge applies when using those payment methods.
construction stormwater fee for project area under 5 acres: 100 USD · construction stormwater fee for project area from 5 to under 40 acres: 250 USD · construction stormwater fee for project area from 40 to under 80 acres: 500 USD · construction stormwater fee for project area of 80 acres or more: 750 USD
“NOIs must also include the first year's stormwater fee, billed to the owner of the project, as follows: Construction Stormwater Fees <5 acres | $100 5 to < 40 acres | $250 40 to < 80 acres | $500 80+ acres | $750”
Stormwater Permit for Construction Activities ↗Re-checked Sep 10, 2026
One more reviewed finding on this topic
- Published (with conditions) — South Dakota state electrical wiring permits, including residential and farmstead wiring subject to state administration.
  “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.”
  South Dakota Electrical Wiring Rules Bulletin ↗Re-checked Sep 12, 2026
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.”
South Dakota Electrical Wiring Rules Bulletin ↗Re-checked Sep 12, 2026
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.”
2000 Session Laws Chapter 69 — Planning and zoning statutes revised ↗Re-checked Sep 21, 2026

Still unanswered

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

Certificate of occupancy — Certificate-of-occupancy or certificate-of-compliance requirements in Buffalo County, South Dakota.
Local zoning — Local zoning within Buffalo County, including incorporated municipalities, townships, and unincorporated areas; this countywide result would aggregate the independently applicable local rules.
Zoning districts — Zoning districts and zoning-district publication for Buffalo County, including any distinction between county, township, municipal, and unincorporated controls.
Minimum dwelling size — Minimum dwelling size in Buffalo County, including unincorporated areas.
Minimum lot size — Minimum lot size in Buffalo County, including unincorporated areas.

9 more unanswered

Setbacks
Lot coverage
Building height
Living in an RV
Camping on your land
Tiny homes
Manufactured homes
Accessory dwellings
Subdividing land

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 Buffalo County, South Dakota

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

Buffalo County scores 43/100 on the Bolthole Index, a marginal county profile. Its strengths: deep seclusion — about 64 people within a 30-minute drive and manageable long-term carry cost. Watch-outs: thin water margin (22.1″/yr rainfall) and elevated current hazard exposure.

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

Buffalo County does not require a county building permit for a home in unincorporated areas, and it has no county-wide 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 Buffalo County, South Dakota?

Land in Buffalo County runs about $1,941 per acre, based on the latest county data.

What is the water situation in Buffalo County?

Buffalo County gets about 22.1" of rain a year, with severe drought in roughly 10.6% of years.

How remote is Buffalo County?

A representative private-land location has about 64 people within a 30-minute drive and 100,717 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.

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

At a glance

Who to call

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

Who handles building and zoning questions in Buffalo County, and how do you reach them?

Does Buffalo County have zoning?

How do septic permits work in Buffalo County?

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

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

What to check before you buy land in Buffalo County

Watch-outs

Sources

Buffalo County in South Dakota

How Buffalo County scores

Find land. Bring the promising ones back.

Parcel due diligence

Answers from the rulebook for Buffalo County

Buffalo County rules

South Dakota rules that apply here

Still unanswered

Living off-grid in Buffalo County, South Dakota

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

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

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

What is the water situation in Buffalo County?

How remote is Buffalo County?

How Buffalo compares in South Dakota