Bolthole Index

Blaine County, Montana

Building permits, zoning and land rules in Blaine County, Montana

46Index Score / 100
#49 of 56 in Montana

Unincorporated Blaine County, Montana does not require a building permit for a typical single-family home1. Montana's state permit rule exempts residential buildings with fewer than five dwelling units unless they serve transient guests, although covered projects remain under the state Building Codes Program2. Blaine County zoning is unconfirmed, septic questions go to Environmental Health, and development in a mapped flood-hazard area requires a county floodplain permit345.

At a glance

Building permit
Not required for a typical home in unincorporated Blaine County12
Zoning
Unconfirmed for unincorporated Blaine County; ask the Clerk and Recorder35
Septic
Environmental Health runs the Septic System Program; individual permit details remain unconfirmed46
RV or tiny home
Private-land occupancy rules are unconfirmed; ask Environmental Health and the Clerk and Recorder365
Owner-builder
No separate exemption confirmed; a typical home is already exempt from the state building permit71
Floodplain
A permit is required before development begins in a Special Flood Hazard Area58
County-road approach
The Road Department publishes an approach application9
Septic soils
Only 10.6% of soils lack severe limits for a conventional drain field10

Who to call

Septic permits

Blaine County Environmental Health

Septic System Program, sanitary review of subdivisions, and well water consultation

(406) 357-3310

[email protected]

P.O. Box 576, Chinook, MT 59523

Floodplain permits

Blaine County Contract Floodplain Administrator

Floodplain permits for development in Special Flood Hazard Areas

(406) 443-3962

[email protected]

1275 Maple Street, Suite F, Helena MT 59601

Roads & driveways

Blaine County Road Department

County roads, county right-of-way work, and approach applications

(406) 357-2840

[email protected]

Blaine County Courthouse, 420 Ohio St, Chinook, MT 59523

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 Blaine County, Montana?

A typical single-family home in unincorporated Blaine County does not need a building permit1. Montana requires state permits for certain new buildings, alterations, additions and repairs, but its exemptions include farm and ranch buildings, residential buildings with fewer than five dwelling units unless used for transient guests, and private garages or storage buildings used by the owner outside a business2. Montana still adopts a uniform state building code for residential and commercial buildings statewide11. A project outside the exemption may therefore need state plan review, permits and inspections1213. Separate electrical, plumbing or mechanical permits may also apply to covered work12.

Who issues permits in Blaine County, Montana?

For a typical home in unincorporated Blaine County, there is no county building permit to obtain; covered non-exempt construction goes through the Montana Building Codes Program112. The state process calls for plans and an application, followed by fees and required inspections1214. Environmental Health is the local contact for the Septic System Program and sanitary subdivision review64. The contract floodplain administrator handles floodplain applications, while the Road Department publishes an approach application59. Exemption from a building permit does not answer septic, floodplain or access questions1659.

Does Blaine County have zoning?

We could not confirm whether Blaine County has adopted zoning for unincorporated land, and subdivision regulations do not by themselves settle that question3. Montana law allows county commissioners to adopt zoning for all or part of their jurisdiction after adopting a growth policy, but that authority does not prove Blaine County used it15. Ask the Clerk and Recorder, whose page hosts subdivision-planning and floodplain information, whether a parcel is affected by zoning, subdivision approval or another restriction5. Minimum dwelling size, minimum lot size, setbacks, lot coverage and building-height rules remain unconfirmed countywide3. Do not treat the lack of confirmed zoning as proof that a parcel is unrestricted3.

How do septic permits work in Blaine County?

Blaine County Environmental Health administers the Septic System Program and sanitary review of subdivisions, while Montana DEQ handles qualifying subdivision sanitation review46. We could not confirm the exact permit or inspection requirement for every individual installation, so ask Environmental Health what application, site evaluation and inspection sequence applies46. Only 10.6% of Blaine County soils lack severe limitations for a conventional drain field10. In a mapped floodplain, the county says septic systems are prohibited unless wastewater can connect to a community system or be pumped outside the floodplain5. Resolve the drainfield location and flood status before choosing a house site105.

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

We could not confirm a Blaine County rule answering long-term RV living or tiny-home occupancy on private land3. Environmental Health inspects licensed trailer courts, RV parks and campgrounds, but that office function does not answer whether one RV may be occupied on a private parcel6. Zoning status, minimum dwelling size and countywide setbacks are also unconfirmed, so ask the Clerk and Recorder about land use and Environmental Health about wastewater365. A tiny home fitting Montana's residential-building exemption may avoid a state building permit, but that exemption does not establish where it may be occupied or how sewage must be handled234.

Building a home in Blaine County: the steps in order

  1. Ask the Clerk and Recorder whether parcel-specific restrictions apply; countywide zoning is unconfirmed35.
  1. Contact Environmental Health about the septic site and required process before fixing the house location46.
  1. Check the flood map; development in a Special Flood Hazard Area needs a permit before work begins58.
  1. For a county-road entrance, ask the Road Department about its approach application9. A state-highway entrance instead needs an MDT approach permit or right-of-way agreement16.
  1. Confirm the project fits Montana's residential exemption; send non-exempt work to the state Building Codes Program212.

What should you check before buying land in Blaine County?

Start with sewage feasibility: only 10.6% of Blaine County soils lack severe limitations for a conventional drain field10. Check flood status because development in a Special Flood Hazard Area needs a permit and the county restricts septic systems there5. Confirm access with the Road Department for county roads or MDT for a state-highway approach916. Water planning matters in a county averaging 14.4 inches of precipitation a year and experiencing severe drought in about 16.6% of years1718. The effective property-tax rate is about 1.5%, and the median annual bill is about $1,9011920. Ask county offices to resolve zoning, wastewater, RV and tiny-home questions for the parcel3465.

Watch-outs

  • Blaine County zoning is unconfirmed, so ask the Clerk and Recorder before relying on an RV, tiny-home, setback or minimum-size plan35.
  • Only 10.6% of Blaine County soils lack severe limitations for a conventional drain field10.
  • Development in a Special Flood Hazard Area requires a permit, and its fee follows the county fee schedule521.

Sources

  1. Montana DLI Certified City, County and Town Programs (2026 county census)
  2. Building Permits (Montana statewide rule), quoted and re-checked
  3. (2026 county census)
  4. Environmental Health Sanitarian | Blaine County, quoted and re-checked
  5. Blaine County Contract Floodplain Administrator (blainecounty-mt.gov)
  6. Blaine County Environmental Health (blainecounty-mt.gov)
  7. (2026 county census)
  8. Stream Permitting (Montana statewide rule), quoted and re-checked
  9. Blaine County Road Department (blainecounty-mt.gov)
  10. Share of soils without severe limits for a conventional septic drain field (USDA SSURGO): Bolthole Index county data
  11. Certified City, County and Town Programs, quoted and re-checked
  12. Building Permits (Montana statewide rule), quoted and re-checked
  13. Montana Building Codes Program, quoted and re-checked
  14. Building Permits (Montana statewide rule), quoted and re-checked
  15. 76-2-201. County zoning authorized, MCA (Montana statewide rule), quoted and re-checked
  16. Approach Manual for Landowners and Developers (Montana statewide rule), quoted and re-checked
  17. Annual precipitation: Bolthole Index county data
  18. Share of years in severe drought: Bolthole Index county data
  19. Effective property tax rate: Bolthole Index county data
  20. Median property tax bill: Bolthole Index county data
  21. Information Sheet: Floodplain Permit Requirement, quoted and re-checked

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

Blaine County in Montana

46
County map
Blaine County highlighted among the Montana counties · colored by Index score

How Blaine County scores

Seclusion89100% ev.
Self-Sufficiency14100% ev.
Admin Boringness7168% ev.
Durability42100% ev.
Property Autonomy83100% ev.
Carry Cost83100% ev.

Evidence strength: 95%. This reports direct-source completeness and fallback use; it is separate from the score and is not a confidence interval. How it works →

$223kTypical home
1.5%Property tax
$849Land / acre
14.4"Annual rain
16.6% of yrsSevere drought
5.2 / yr (+4.6)Mid-century 100°F days
22.2 daysMid-century dry spell
1.12" (+7.3%)Mid-century 1-day rain
1.26×Wildfire change factor
100%Forward climate coverage
$1,734Home insurance / yr
0.5% / yrInsurance growth
2.31%Nonrenewal rate
county median (2+ published ZIPs)Insurance basis
378Radius comparison (15 mi)
1.6People / sq mi
19.3%Federal land
69.9%Land at 15% slope or less
10.6%Septic soil without severe limits
279,430 acWorkable land screen
6.2%Wooded land
10.4 tonsBiomass / forest ac
42.7°FAvg temp

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Answers from the rulebook for Blaine County

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

Blaine County rules

  • Who permits septicMixed (with conditions)

    On-site septic and sanitation review in Blaine County, with county environmental-health administration and Montana DEQ subdivision sanitation review.

    • The Blaine County Environmental Health Provider administers the county Septic System Program and sanitary subdivision review.
    • Montana DEQ reviews qualifying subdivisions for water supply, sewage disposal, solid waste disposal, and storm drainage.
    “WHAT THE EHP DOES [...] Septic System Program [...] Sanitary Review of Subdivisions of Land”
    One more reviewed finding on this topic
    • County — County environmental-health administration of the septic system program.
      “WHAT THE EHP DOES [...] Septic System Program [...] Sanitary Review of Subdivisions of Land”
  • Off-grid sanitationLimited

    Private wastewater or off-grid sanitation systems in Blaine County floodplain areas.

    • Septic systems are prohibited in the floodplain.
    • A building requiring water and sewage facilities may proceed only if connected to a community wastewater system or sewage is pumped out of the floodplain.
    “Septic systems are prohibited in the floodplain.”
  • Mandatory utility hookupConditional

    Buildings requiring water and sewage facilities in Blaine County floodplain areas.

    • The building must be connected to a community wastewater system or the sewage must be pumped out of the floodplain.
    • The county page separately states that septic systems are prohibited in the floodplain.
    “Unless the building can be connected to a community wastewater system, or the sewage can be pumped out of the floodplain, no building requiring water and sewage facilities can be built in the floodplain.”
  • Subdividing landRegulated (with conditions)

    Subdivision and transfer review in Blaine County.

    • The county sanitarian and planner should be contacted before filing an instrument of transfer.
    • A survey, Blaine County Commissioners approval, or Montana DEQ approval may be required depending on circumstances.
    • Subdivisions creating lots with existing structures or potential building sites typically take several months and often require a consultant.
    • Subdivisions in floodplains are prohibited.
    “The Blaine County Sanitarian and the Blaine County Planner should be contacted for approval of any instrument of transfer prior to filing. Depending upon the circumstances involved, a survey may be required, approval by the Blaine County Commissioners may be required, or approval by the Montana Department of Environmental Quality may be required.”
  • Building in a floodplainRequired

    Building in Blaine County floodplain areas.

    • A floodplain permit is required before building in the floodplain.
    • If built in the floodway, the building must be removed.
    • Septic systems are prohibited in the floodplain.
    • A building requiring water and sewage facilities cannot be built unless connected to a community wastewater system or sewage is pumped out of the floodplain.
    • The county page notes that much of Blaine County, including parts of Chinook, is in the floodplain.
    “Much of Blaine County, including parts of Chinook, is in the floodplain and a floodplain permit is required prior to building in the floodplain.”
  • Permit feesVariable (with conditions)

    Blaine County floodplain permit fees.

    • Fees are tied to the County fee schedule.
    • The cited source does not publish the fee amount.
    “Fees are used to ensure the County does not incur a debt while reviewing development applications. Floodplain permit fees are tied to the County fee schedule.”
  • Permit processPartial

    Blaine County subdivision review and floodplain permitting processes.

    • Subdivision applicants should contact the county sanitarian and planner before filing.
    • A survey, county commissioner approval, or DEQ approval may be required depending on circumstances.
    • A floodplain permit is required before building in the floodplain.
    • The county page refers applicants to WWC Engineering for more information.
    “The Blaine County Sanitarian and the Blaine County Planner should be contacted for approval of any instrument of transfer prior to filing. [...] Much of Blaine County, including parts of Chinook, is in the floodplain and a floodplain permit is required prior to building in the floodplain.”

Montana rules that apply here

  • Building permitLimited

    Construction, remodeling, moving, alterations, additions, repairs, or changes of occupancy for buildings subject to Montana state building-code jurisdiction.

    • A state building permit is required before construction for certain types of new buildings and for certain alterations, additions, and repairs.
    • The state permit requirement does not apply to projects within the jurisdictional limits of a certified local government program; local requirements may apply there.
    • In the state's jurisdiction, state law exempts farm and ranch buildings; mining buildings on mining property; petroleum refineries and pulp and paper mills except office and shop buildings; residential buildings containing less than five dwelling units except when serving transient guests; and private garages and private storage buildings used for the owner's own use and not as part of a commercial enterprise or business.
    • Building permits must be issued on required projects before plumbing, mechanical, or electrical permits can be issued and before work authorized under those permits can start.
    “In Montana a state building permit is required prior to the start of construction for certain types of new buildings, and/or for alterations, additions, and repairs.”
    2 more reviewed findings on this topic
    • Limited — Non-exempt construction in Blaine County areas under the State Building Codes Bureau.
      “In Montana a state building permit is required prior to the start of construction for certain types of new buildings, and/or for alterations, additions, and repairs.”
    • Not required — Residential buildings containing fewer than five dwelling units in Blaine County areas under state jurisdiction.
      “residential buildings containing less than five dwelling units (except when serving transient guests)”
  • Building code adoptedAdopted (with conditions)

    Montana's uniform state building code for residential and commercial buildings statewide.

    • The currently listed codes are amended and adopted through Administrative Rules of Montana Title 24, Chapter 301.
    • Cities, counties, and towns may enforce local building codes, all or in part, only through certified local building-code-enforcement programs.
    • State-owned agencies must be permitted through the Montana Department of Labor and Industry.
    • The listed 2021 International Building, Residential, and Existing Building Codes and related codes are effective June 11, 2022; the listed ASME boiler and pressure-vessel codes are effective November 6, 2021.

    International Building Code edition: 2021 · International Residential Code edition: 2021 · effective date for listed principal codes: 2022-06-11 (ASME boiler and pressure-vessel codes listed on the official page are effective 2021-11-06)

    “In addition, the program is responsible for adopting a uniform state building code, which is enforced statewide for residential and commercial buildings across Montana.”
    One more reviewed finding on this topic
    • Adopted (with conditions) — State building codes applicable in Blaine County areas not covered by a certified local government program.
      “A city, county or town building code may include only codes adopted by the Building Codes Program. [...] All other areas are under the jurisdiction of the State Building Codes Bureau”
  • InspectionsLimited

    Projects in Blaine County that require a state building permit.

    • Inspection applies to required-permit projects.
    • The permit holder must notify the inspector when work is ready and provide access for required inspections.
    • Exempt projects are not covered by this state permit-inspection process.
    “It is the responsibility of the permit hold to notify the inspector when work is ready for inspection and to provide access for required inspections.”
    2 more reviewed findings on this topic
    • Limited — Projects requiring Montana building, plumbing, electrical, or mechanical permits in Blaine County.
      “Field inspection staff for the programs are positioned around the state to ensure adequate coverage for inspection and regulation of projects requiring a permit.”
    • Limited — Buildings and other projects requiring permits under Montana state building-code jurisdiction; certified local governments may perform inspections within their certified jurisdictional areas.
      “The BC Program establishes and enforces statewide codes by issuing permits and performing inspections.”
  • Certificate of occupancyLimited

    Buildings constructed in accordance with the Montana state building code or a county, city, or town building code.

    • The certificate must certify that the building conforms to the applicable building regulations.
    • The statute addresses certificates for buildings constructed under the state or local building code; it does not establish a universal certificate requirement for every structure or every occupancy.
    “A certificate of occupancy for a building constructed in accordance with the provisions of the state building code or county, city, or town building code must certify that the building conforms to the requirements of the building regulations applicable to it.”
  • Septic permitRequired

    Installation of a drainfield in Montana, including property already covered by a Certificate of Subdivision Approval.

    • A Certificate of Subdivision Approval does not replace the drainfield permit.
    • The cited page identifies the local health department as the permitting authority.
    “Yes, even thought you have a COSA, a drainfield permit is still required by the local health department.”
  • Driveway accessLimited

    New or modified driveway approaches intersecting Montana state highways, and changes in use of property abutting a state highway or an existing approach.

    • A new or modified approach requires either an approach permit or a right-of-way agreement.
    • A change in property use or change in use of an existing approach requires a new approach permit.
    • The landowner is responsible for obtaining the new permit.
    • The application must be made to the appropriate MDT District Office.
    • A detailed site plan and Environmental Checklist Form are required.
    • The requirement concerns state highways; local roads may be administered by local governments.
    “ALL NEW OR MODIFIED APPROACHES REQUIRE EITHER AN APPROACH PERMIT OR A RIGHT-OF-WAY AGREEMENT.”
  • Short-term rentalsLimited

    Short-term rentals operated in Montana.

    • A Property Manager license is required unless the operator qualifies for an exemption under MCA § 37-56-104 or MCA § 50-51.
    • Local land-use, lodging, tax, and public-accommodation requirements may also apply.

    application fee: 50 USD

    “Short Term Rentals: A Property Manager license is required for short term rentals unless an operator qualifies for an exemption”
  • Campground & park staysLimited

    Camping in Montana Fish, Wildlife & Parks public-use sites.

    • Camping is prohibited except in areas specifically designated or marked for camping.
    • A camping unit, vehicle, equipment, or personal items may not be left overnight without a person present.
    • Camping longer than 7 nights at one or more campsites in a public use area during any consecutive 30-day period is prohibited unless otherwise posted by the department.
    • Designated occupancy limits must not be exceeded.
    • Special-use-permit terms must be followed unless otherwise posted.
    • Campsites must be vacated by 1 p.m. on the day of departure; camping facilities must be vacated by 12 p.m. on the day of departure.

    maximum camping duration: <= 7 nights per consecutive 30-day period (unless otherwise posted by the department) · campsite departure time: 1 p.m. · camping-facility departure time: 12 p.m.

    “Unless otherwise posted by the department, within a public use site it is prohibited to: [...] camp at one or more campsites in a public use area for a period of longer than 7 nights during any consecutive 30-day period, beginning with the first night occupied unless otherwise posted by the department;”
  • county zoning authorityGeneral

    Montana boards of county commissioners adopting zoning regulations for all or parts of their jurisdictional areas, including unincorporated land.

    • The board of county commissioners must have adopted a growth policy pursuant to Montana Code Annotated chapter 1.
    • Zoning regulations must be adopted in accordance with Title 76, chapter 2.
    • The statute also contains a temporary provision for counties that adopted a master plan before October 1, 1999; that provision authorized adoption or revision only until October 1, 2006.
    “a board of county commissioners that has adopted a growth policy pursuant to chapter 1 is authorized to adopt zoning regulations”

Still unanswered

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

  • Owner-builder exemption — Owner-builder exemptions from building permits or inspections in Blaine County.
  • County-wide zoning — Countywide zoning in Blaine County.
  • Local zoning — Local zoning within Blaine County, including incorporated municipalities and other local jurisdictions.
  • Zoning districts — Published county zoning districts in Blaine County.
  • Minimum dwelling size — Minimum dwelling size in Blaine County.
12 more unanswered
  • Minimum lot size
  • Setbacks
  • Lot coverage
  • Building height
  • Living in an RV
  • Camping on your land
  • Tiny homes
  • Manufactured homes
  • Accessory dwellings
  • Septic inspection
  • Well permit
  • Agricultural exemption

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 Blaine County, Montana

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

Blaine County scores 46/100 on the Bolthole Index, a marginal county profile. Its strengths: deep seclusion — about 378 people within 15 miles and manageable long-term carry cost. Watch-outs: weak self-sufficiency basics: only 14.4″ of rain a year and elevated current hazard exposure.

Do you need a building permit in Blaine County, Montana?

Blaine County does not require a county building permit for a home in unincorporated areas. Onsite septic is permitted by Blaine County Environmental Health / Registered Sanitarian (Septic System Program). 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 Blaine County, Montana?

Land in Blaine County runs about $849 per acre, based on the latest county data.

What is the water situation in Blaine County?

Blaine County gets about 14.4" of rain a year, with severe drought in roughly 16.6% of years.

How remote is Blaine County?

A typical private-land location has about 378 people within 15 miles and 96,475 within 100 miles. These radius catchments are the published fallback where road routing is unavailable.

Off-grid gear

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

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How Blaine compares in Montana

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