Bolthole Index

Cascade County, Montana

Building permits, zoning and septic rules in Cascade County, Montana

72Index Score / 100
#9 of 56 in Montana

In the Cascade County, Montana Zoning Jurisdictional Area, most proposed buildings, structures, signs, and land-use changes require a county Location/Conformance Permit12. Structural building permits are separate: Great Falls runs its own certified program, while the State Building Codes Bureau handles covered work elsewhere and exempts many homes and farm or ranch buildings34. Countywide, private septic work requires a CCHD septic permit56.

At a glance

Building permit
County Location/Conformance Permit generally required in the zoning area; state structural permits depend on project and jurisdiction13
Zoning
County zoning districts are published, and parcel standards vary by district and jurisdiction789
Septic
Private systems need a CCHD permit and inspection; DEQ regulates community systems101112
Farm or ranch building
Exempt from the state building permit, but other county and municipal rules may apply13
Owner-builder exemption
Available under Montana contractor-licensing law, but it does not waive project permits or inspections14
Private well
Larger groundwater uses need a state water permit; qualifying smaller wells use the exception and certificate process15
Floodplain
Development in a designated county floodplain needs approval before work starts16

Who to call

Planning & zoning

Cascade County Planning & G.I.S. Department

Location/Conformance Permits, zoning administration, floodplain regulations, and subdivision review for unincorporated Cascade County

406-454-6905

121 4th Street N, Suite 2H/I, Great Falls, MT 59401

Septic permits

Cascade City-County Health Department (CCHD) - Environmental Health Services

Septic (OSSF) permitting and inspection for Cascade County, plus food safety, air quality, and sanitation programs

406-454-6950

115 4th Street S, Great Falls, MT 59401

Septic permits

Cascade City-County Health Department - Septic Systems Program

Septic permit applications, test-hole evaluations, and the online septic permitting portal for Cascade County

Roads & driveways

Cascade County Road & Bridge Division

Approach (driveway) and excavation permits for county roads in Cascade County

406-454-6920

279 Vaughn S Frontage Road, Great Falls, MT 59404

Contact details are copied from each office’s official page and were checked against it on October 10, 2026.

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

Cascade County uses separate zoning and structural building-permit tracks. In the county Zoning Jurisdictional Area, a Location/Conformance Permit is generally required for a proposed building, structure, sign, land use, or land-use change; site preparation and a noncommercial structure of 200 square feet or less are listed exemptions1. The standard county application fee is $75, with a $300 after-the-fact fee if construction or use starts before issuance17. Structural building-permit jurisdiction is different: Great Falls administers its certified program within city limits, while the State Building Codes Bureau handles covered construction elsewhere3. In state jurisdiction, many small residential buildings, except transient lodging, and farm or ranch buildings are exempt from state building permits4. County zoning approval and CCHD septic permits remain separate from either structural building-permit path25. Montana's qualifying owner-builder exemption concerns contractor licensing; it does not waive applicable zoning approval, building permits, septic permits, or inspections14.

Who is the Cascade County Planning & G.I.S. Department, and how do you reach them?

Cascade County does not provide one building department for every permit. The Cascade County Planning & G.I.S. Department handles county Location/Conformance Permits, zoning, floodplain review, and subdivision questions outside Great Falls and the incorporated towns of Belt, Cascade, and Neihart18. Reach the department at 121 4th Street N, Suite 2H/I, Great Falls, MT 59401, or 406-454-690518. Great Falls administers structural building permits within its certified jurisdiction, while the State Building Codes Bureau administers covered work elsewhere3. For covered state work, plans and an application come before fee payment, building-permit issuance, and inspections; electrical, plumbing, or mechanical permits may be separate19. Regardless of who handles structural building permits or municipal zoning, CCHD handles private septic permits and inspections throughout Cascade County, while Montana DEQ regulates community wastewater systems5. The county publishes its planning, zoning, and septic application paths20.

Does Cascade County have zoning?

Yes. Cascade County zoning covers the county Zoning Jurisdictional Area, while incorporated cities and towns and other separately regulated areas use their own zoning rules2. Standards differ by parcel and district, and the county publishes an interactive map, a zoning map book, and its zoning regulations21. Great Falls, Belt, Cascade, and Neihart do not use the county Planning office for their municipal zoning administration18. CCHD septic permits, however, remain countywide even where a city or town controls zoning5. We could not confirm one current countywide minimum dwelling size, setback, lot-coverage limit, minimum lot size, or tiny-home rule. Ask the Planning & G.I.S. Department to identify the parcel's jurisdiction and zoning district before choosing a house plan, placing an RV, or relying on a listing's description18. In the county Zoning Jurisdictional Area, a Location/Conformance Permit is generally required for buildings and land-use changes, subject to stated exemptions1.

How do septic permits work in Cascade County?

Private septic systems throughout Cascade County are regulated by the county and City-County Board of Health and permitted and inspected by CCHD Environmental Health Specialists; Montana DEQ regulates community wastewater systems5. A CCHD septic permit is required before a private system is constructed, altered, or repaired and is valid for 180 days6. Outside an approved subdivision, review can include a site evaluation and soil profile, with an 8-foot test hole within 25 feet of the intended drainfield and an Environmental Health Specialist present during excavation2212. Only 7.9% of county soils lack severe limitations for a conventional drain field, so price the system after the parcel evaluation23. Fees vary by permit type and installer certification; a site evaluation costs $100 plus $1.00 per round-trip mile, and a non-degradation analysis costs $10024. The published septic process may also require water sampling or a non-degradation review20.

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

We could not confirm a countywide rule allowing RV living or tiny-home occupancy on private land in Cascade County. The answer can change with the parcel because zoning standards differ among county districts and separate municipal jurisdictions78. Use the county's published zoning maps, then ask the Planning & G.I.S. Department whether the proposed RV or tiny home is allowed in that district and whether Location/Conformance approval is required918. A tiny home used as a residence may fit a state structural-permit exemption, but that exemption does not remove county zoning, septic, floodplain, or municipal requirements41. The state recreation-site camping limit does not answer what is allowed on private property25.

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

  1. Identify the parcel's zoning jurisdiction, zoning district, and floodplain status with the county maps and Planning & G.I.S. Department2118.
  2. If the project divides land, start with County Planning because subdivision and sanitation review depend on the proposal and parcel acreage2620.
  3. In the county Zoning Jurisdictional Area, apply for the county Location/Conformance Permit before beginning a covered building or land use1.
  4. Determine whether Great Falls or the State Building Codes Bureau handles the structural building permit, then confirm whether the project is exempt or needs plan review and inspections3427.
  5. Apply to CCHD for the septic permit before constructing, altering, or repairing a private septic system, and complete any required site evaluation62012.
  6. For a county-road approach, obtain the county approach permit; for a state-highway approach, follow the state permit path2829. If the site is in a designated floodplain, obtain county floodplain approval before development; a new road or driveway there specifically requires that approval1630.

What to check before you buy land in Cascade County

Confirm water before closing: groundwater use above 35 gallons per minute or 10 acre-feet per year requires a state water permit, while qualifying smaller developments may use the exempt-well certificate process and must file a Notice of Intent before use15. Cascade County averages 17 inches of precipitation a year and experiences severe drought in about 10.9% of years3132. Price septic after evaluating the parcel because just 7.9% of county soils lack severe limits for a conventional drain field23. Check the zoning map and ask Planning which district standards apply rather than assuming a rural address has no zoning221. If the sale depends on dividing the tract, confirm the subdivision and sanitation review path before closing26. Confirm floodplain status and legal access because designated-floodplain development needs prior approval, including new roads and driveways, while county-road and state-highway approaches follow different permit paths302829.

Watch-outs

  • We could not confirm whether Cascade County allows RV living or tiny-home occupancy on a particular private parcel; ask Planning after identifying the parcel's zoning district918.
  • A state building-permit or contractor-licensing exemption does not cancel county zoning, septic, floodplain, or other project approvals414.
  • Cascade County's soils are mostly rated severely limited for a conventional septic drain field, with only 7.9% free of that rating, so budget time and money for a site evaluation before you assume a standard system will work23.

Sources

  1. Forms & Permit Applications, quoted and re-checked
  2. Regulations & Ordinances, quoted and re-checked
  3. Certified City, County and Town Programs, quoted and re-checked
  4. Building Permits, quoted and re-checked
  5. Septic Systems & My Health Department Portal, quoted and re-checked
  6. Septic Systems & My Health Department Portal, quoted and re-checked
  7. Zoning Information, quoted and re-checked
  8. Planning & G.I.S., quoted and re-checked
  9. Zoning Information, quoted and re-checked
  10. Septic Systems & My Health Department Portal, quoted and re-checked
  11. Septic Systems & My Health Department Portal, quoted and re-checked
  12. Septic Systems & My Health Department Portal, quoted and re-checked
  13. Building Permits, quoted and re-checked
  14. Montana Code Annotated, Title 37, Chapter 45, Construction Contractors (Montana statewide rule), quoted and re-checked
  15. Exempt Well Updates and Information, quoted and re-checked
  16. Floodplain Regulations, quoted and re-checked
  17. Forms & Permit Applications, quoted and re-checked
  18. Cascade County Planning & G.I.S. Department (cascadecountymt.gov)
  19. Building Permits (Montana statewide rule), quoted and re-checked
  20. Planning & G.I.S., quoted and re-checked
  21. Zoning Information, quoted and re-checked
  22. Cascade City-County Health Department - Septic Systems Program (cascadecountymt.gov)
  23. Share of soils USDA rates "not limited" for a conventional septic drain field (SSURGO). A strict rating: the median county is about 6% and a tenth of counties are 0%, so a low figure means most lots need a site evaluation or an engineered system, not that septic is impossible. Cite it only with that caveat: Bolthole Index county data
  24. Septic Systems & My Health Department Portal, quoted and re-checked
  25. Public Use Rules and Regulations (Montana statewide rule), quoted and re-checked
  26. Subdivisions, quoted and re-checked
  27. Building Permits, quoted and re-checked
  28. Cascade County Road & Bridge Division (cascadecountymt.gov)
  29. Approach Manual for Landowners and Developers (Montana statewide rule), quoted and re-checked
  30. Floodplain Permit Application, quoted and re-checked
  31. Annual precipitation: Bolthole Index county data
  32. Share of years in severe drought: Bolthole Index county data

Written October 10, 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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Compared with neighboring counties

Unlike 5 of its 6 neighbors, Cascade County requires a building permit only in limited cases.

RuleCascade CountyTeton CountyMeagher CountyLewis and Clark CountyJudith Basin CountyChouteau CountyBroadwater County
Building permitLimitedNot requiredNot requiredNot requiredNot requiredLimitedNot required
County zoningYesNoNot publishedYesNoYesNo
Septic permitsCCHDCounty SanitarianCounty SanitarianLewis & Clark Public HealthCentral Montana Health DistrictCounty SanitarianCounty Env. Health

County locator

Cascade County in Montana

72
County map
Cascade County highlighted among the Montana counties · colored by Index score

How Cascade County scores

Seclusion82100% ev.
Self-Sufficiency45100% ev.
Admin Boringness5590% ev.
Durability52100% ev.
Property Autonomy83100% ev.
Carry Cost81100% 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 →

$345kTypical home
0.9%Property tax
$1,234Land / acre
17"Annual rain
10.9% of yrsSevere drought
2.7 / yr (+2.4)Mid-century 100°F days
20 daysMid-century dry spell
1.25" (+7.3%)Mid-century 1-day rain
1.23×Wildfire change factor
100%Forward climate coverage
$1,713Home insurance / yr
3.6% / yrInsurance growth
0.85%Nonrenewal rate
county median (2+ published ZIPs)Insurance basis
179,322People within 2 hr
4,017Radius comparison (15 mi)
31.5People / sq mi
13.1%Federal land
63.2%Land at 15% slope or less
7.9%Soils rated "not limited" for septic (strict USDA rating)
132,611 acWorkable land screen
23.6%Wooded land
26.5 tonsBiomass / forest ac
43.5°FAvg temp

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Cities and towns in Cascade County

Inside a city or town, that city usually issues building permits and sets zoning; the county’s rules above cover unincorporated land. Septic, wells and floodplain rules usually stay with the county or state everywhere.

Not yet researched: Town of Belt · Town of Neihart

Answers from the rulebook for Cascade County

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

Cascade County rules

  • Building permitLimited

    Residential construction and other construction in Cascade County, subject to state permit exemptions, certified local programs, and county zoning approvals.

    • Montana exempts residential buildings containing fewer than five dwelling units from state building permits except when serving transient guests.
    • Farm and ranch buildings, mining buildings on mining property, certain industrial buildings, and private garages and storage buildings are also exempt from state permits.
    • Local governments may impose additional requirements.
    • County zoning requirements still apply where the parcel is in a county zoning district.
    “In the State's jurisdiction, state law exempts the following from the need to obtain state building permits: [...] residential buildings containing less than five dwelling units (except when serving transient guests)”
    One more reviewed finding on this topic
    • Limited — Proposed buildings, structures, signs, land uses, and changes in land use within the Cascade County Zoning Jurisdictional Area.
      “This is required for all proposed buildings, structures, signs, land uses, and changes in land use within the Zoning Jurisdictional Area except where exempted under Section 9.2.3.”
  • Building code adoptedPartial

    Building-code administration across Cascade County: Great Falls has a certified local building-code program, while other areas are under the State Building Codes Bureau.

    • Great Falls is listed as a certified jurisdiction for building code within city limits.
    • The state page says all other areas are under the State Building Codes Bureau.
    “All other areas are under the jurisdiction of the State Building Codes Bureau [...] Great Falls | B, P(M/G) E, M, SP, W | Bruce Haman | 455-8430 | City Limits”
  • County-wide zoningPresent (with conditions)

    Cascade County Zoning Regulations within the county Zoning Jurisdictional Area.

    • The current Cascade County Zoning Regulations were adopted March 20, 2026.
    • Incorporated municipalities and other separately regulated areas may be outside county zoning jurisdiction.
    “In 2007, Cascade County adopted Zoning Regulations.”
    One more reviewed finding on this topic
    • Present (with conditions) — County zoning districts and land-use standards in Cascade County, excluding incorporated municipal jurisdictions where separate municipal rules apply.
      “The development plan labeled all land within Cascade County, that was not part of an incorporated City or Town, City-County Jurisdictional Area, or other created Zoning District, as residential/agricultural zoned land.”
  • Local zoningVaries (with conditions)

    Aggregate county record covering county zoning and separate incorporated-city and town jurisdictions.

    • The county Planning Department directs applicants outside Great Falls, Belt, Cascade, and Neihart to contact the county concerning applicable regulations.
    • This aggregate conclusion does not attribute municipal ordinances to Cascade County.
    “If you plan on building or developing land in Cascade County but outside the City of Great Falls, the incorporated towns of Belt, Cascade, or Neihart, please contact this office concerning any applications and regulations that may need to be adhered to prior to any development work.”
  • Zoning districtsPublished

    Zoning districts and zoning maps published for Cascade County parcels.

    • Standards differ by zoning district and parcel.
    • The zoning information page directs users to zoning maps and the Cascade County Zoning Regulations.
    “Cascade County has several different zoning districts throughout the county. Depending on what zoning district a parcel is located, land use standards and requirements will differ.”
    One more reviewed finding on this topic
    • Published (with conditions) — Zoning districts and maps published for Cascade County parcels.
      “The Planning & G.I.S. Department has launched a new interactive GIS map that improves user function and allows property owners, potential property buyers, real estate agents, and developers to easily check property zoning, floodplain, and Military Height Overlay Districts within the county from anywhere!”
  • Who permits septicMixed (with conditions)

    Private septic systems and public/community wastewater systems in Cascade County.

    • Private septic systems are regulated by Cascade County and the City-County Board of Health and permitted and inspected by CCHD Environmental Health Specialists.
    • Community wastewater systems are regulated by the Montana Department of Environmental Quality.
    • Great Falls and other municipalities use public wastewater systems.
    “Private Subsurface Wastewater Treatment Systems (Septic Systems) are regulated by Cascade County and the City-County Board of Health. Septic Systems are permitted and inspected by Environmental Health Specialists (EHS) from CCHD.”
    One more reviewed finding on this topic
    • Mixed (with conditions) — Private septic systems and community wastewater systems in Cascade County.
      “Private Subsurface Wastewater Treatment Systems (Septic Systems) are regulated by Cascade County and the City-County Board of Health. [...] All community wastewater systems are regulated by the Montana Department of Environmental Quality (DEQ).”
  • Septic permitRequired

    Private septic systems constructed, altered, or repaired in Cascade County.

    • The permit must be obtained before installation.
    • Permits are valid for 180 days.
    • Alteration requests and extensions must be submitted in writing.
    • Fees depend on permit type and whether the installer is certified.

    permit validity: 180 days · replacement tank or drainfield, non-certified installer: 175 USD · replacement tank or drainfield, certified installer: 100 USD · replacement tank and drainfield, non-certified installer: 250 USD · replacement tank and drainfield, certified installer: 200 USD · new system in DEQ pre-approved subdivision, non-certified installer: 325 USD · new system in DEQ pre-approved subdivision, certified installer: 175 USD · new system not in DEQ pre-approved subdivision, non-certified installer: 575 USD · new system not in DEQ pre-approved subdivision, certified installer: 325 USD

    “A Septic Permit is required when a septic system is constructed, altered, or repaired. The Permit must be obtained prior to system installation. Permits are valid for 180 days.”
    One more reviewed finding on this topic
    • Required — Private septic systems in Cascade County.
      “A Septic Permit is required when a septic system is constructed, altered, or repaired. The Permit must be obtained prior to system installation. Permits are valid for 180 days. Permit alteration requests and extensions must be submitted in writing.”
  • Septic inspectionRequired

    Private septic systems in Cascade County.

    • Inspection is performed by CCHD Environmental Health Specialists.
    • An Environmental Health Specialist must be onsite when an outside-subdivision test pit is dug to collect soil samples.
    “Septic Systems are permitted and inspected by Environmental Health Specialists (EHS) from CCHD. [...] An Environmental Health Specialist (EHS) must be onsite when the test pit is dug to collect soil samples from different soil horizons.”
  • Subdividing landRegulated (with conditions)

    Subdivision review and approval in Cascade County.

    • CCHD and DEQ review subdivisions under 20 acres for Montana Sanitation in Subdivisions Act compliance.
    • CCHD reviews parcels between 20 and 160 acres under Cascade County Subdivision Regulations.
    • Parcels greater than 160 acres are exempt from the described review.
    • County Planning reviews compliance with the Montana Subdivision and Platting Act and Cascade County Subdivision Regulations.

    CCHD/DEQ review threshold: < 20 acres · CCHD county-regulation review range: 20-160 acres · review exemption threshold: > 160 acres

    “The Cascade County Planning Division reviews subdivisions for compliance with the Montana Subdivision and Platting Act and Cascade County Subdivision Regulations.”
  • Driveway accessRequired

    Construction of new roads or driveways in designated Cascade County floodplain areas.

    • A floodplain permit is required for development activity in the designated floodplain.
    • The source identifies constructing new roads or driveways as an example of a project requiring an approved floodplain permit.
    “The following are examples of projects that would require an Approved Floodplain Permit: [...] Constructing new roads or driveways, bridges, docks, boat ramps”
  • Building in a floodplainRequired

    Development activity in designated Cascade County floodplain areas.

    • Floodplain permits are not required for routine maintenance of existing buildings, bridge deck rehabilitation, roadway pavement preservation, tilling, farming, irrigating, ranching, harvesting, or grazing when those activities do not involve structures, filling, grading, or construction of levees.
    • New construction in the 100-year floodplain must meet wet- or dry-floodproofing requirements.
    • Dry floodproofing requires structures to be two feet above the estimated floodwater elevation, the Base Flood Elevation (BFE).
    • Wet floodproofing requires structures to be elevated at least to the BFE and include flood-prevention vents.
    • No new construction is allowed in the Regulatory Floodway.

    dry floodproofing elevation: >= 2 feet above BFE

    “A Floodplain Permit Application must be submitted and approved by the Floodplain Administrator prior to all development activity to assure the County and the property owner(s) that all applicable flood code standards are met.”
  • Permit feesPublished (with conditions)

    Cascade County planning and land-use permit fees, including Location/Conformance Permits.

    • The county forms page states that land-use fees were revised July 12, 2022 by Resolution 22-46.
    • L/C applications cost $75; after-the-fact applications cost $300; an additional $25 applies when an address is needed.
    • Septic fees vary by permit type and installer certification.

    standard L/C application fee: 75 USD (non-refundable) · after-the-fact L/C application fee: 300 USD (non-refundable) · address assignment fee: 25 USD (when an address is needed)

    “L/C Permit Applications require a non-refundable application fee of seventy-five dollars ($75.00).”
    One more reviewed finding on this topic
    • Published (with conditions) — Cascade County septic permits and related site evaluations.
      “Replacement Tank OR Drainfield, Connection to Existing | $175 | $100 [...] New System (NOT in DEQ Pre-Approved Subdivision) | $575 | $325”
  • Permit processPublished (with conditions)

    County planning, zoning, and septic permitting processes in Cascade County.

    • Applicants are directed to contact the Planning & G.I.S. Department for applications and regulations before development work.
    • Septic applicants must complete the application and upload drawings, diagrams, surveys, or schematics through the portal.
    • Paper septic applications are accepted until October 1, 2026; after that date portal submission is required.

    paper septic application transition date: 2026-10-01

    “We will continue to accept paper applications until 10/1/2026, at which time we will require applications to be submitted through the My Health Department portal.”
    One more reviewed finding on this topic
    • Partial — County planning, septic, subdivision, and floodplain permitting processes in Cascade County.
      “Anyone interested in subdividing land should contact the County Planning Division first at 406-454-6905 to initiate the review process.”

Montana rules that apply here

  • Owner-builder exemptionAvailable

    An owner working on the owner's property, or an owner contracting for work performed by a registered construction contractor, under Montana's construction-contractor licensing chapter.

    • The exemption does not apply to an owner otherwise covered by the chapter who constructs a residence on the owner's property intending and for the purpose of promptly selling the improved property.
    • For an owner working on the owner's property, the resale exception does not apply if the owner has continuously occupied the property as the owner's primary residence for at least the last 12 months.
    • This is an exemption from the construction-contractor licensing chapter; it does not itself exempt a project from applicable building, electrical, plumbing, mechanical, or inspection requirements.

    primary-residence occupancy period for resale exception: >= 12 months (The statute states the owner must have continuously occupied the property as the owner's primary residence for at least the last 12 months.)

    “(13) to an owner working on the owner's property, whether occupied by the owner or not, but this exemption does not apply to an owner”
  • InspectionsLimited

    Buildings and other projects requiring permits under Montana state building-code jurisdiction; certified local governments may perform inspections within their certified jurisdictional areas.

    • The Montana Building Codes Program performs inspections for projects requiring a permit under state jurisdiction.
    • The permit holder must notify the inspector when work is ready for inspection and provide access for required inspections.
    • Cities, counties, and towns may enforce local building codes and perform inspections only through certified local government programs; remaining areas fall under the state Building Codes Program.
    “The BC Program establishes and enforces statewide codes by issuing permits and performing inspections.”
    One more reviewed finding on this topic
    • Limited — State-permitted construction in Cascade County areas under the State Building Codes Bureau.
      “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.”
  • 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.”
  • Living in an RVLimited

    RV, camper-trailer, and other trailer overnight use for general recreation on legally accessible Montana state trust land administered by DNRC.

    • A Conservation License is required for dispersed camping on state trust land.
    • RV or trailer camping must be within 50 feet of a customary access point; motorized vehicles must be parked within 50 feet of a customary access point, and the camper or trailer may not be set up farther away by driving beyond that point.
    • On leased or licensed land, the stay limit is 2 days.
    • On unleased or unlicensed land, the stay limit is 16 days within a 30-day period.
    • Within a designated campground, the stay limit is 16 days within a 30-day period.
    • The local DNRC field office should be contacted to confirm whether land is leased.
    • Pets must be leashed or otherwise controlled.
    • Overnight horses must be restrained, may not remain in a stream riparian zone for more than one hour, and must use certified weed-seed-free feed.
    • Campfires are generally permitted within designated campgrounds and on unleased or unlicensed land but are not allowed on leased land.
    • Cutting firewood requires a separate permit from the local DNRC field office, and fireworks are not allowed on state land.
    • State Parks, Fishing Access Sites, and Wildlife Management Areas are managed by Montana Fish, Wildlife and Parks rather than under this DNRC camping page.

    RV/trailer distance from customary access point: <= 50 ft (Motorized vehicles must be parked within 50 feet; the page states the camper or trailer may not be driven farther to set it up.) · maximum stay on leased or licensed land: 2 days · maximum stay on unleased or unlicensed land: 16 days within a 30-day period · maximum stay within designated campground: 16 days within a 30-day period

    “TRAILER/RV etc. Camp within 50 ft of a customary access point. Motorized vehicles must be parked within 50 ft of a customary access point. You may not drive further to set up a camper or trailer. On leased or licensed land: 2 days On unleased/unlicensed land: 16 days within a 30-day period Within designated campground: 16 days within a 30-day period”
  • Manufactured homesAllowed (with conditions)

    Manufactured housing used as residential housing within Montana municipalities that exercise zoning powers under MCA Title 76, chapter 2, part 3.

    • Municipal zoning regulations may not treat manufactured housing or factory-built housing units differently from other residential units.
    • Placement remains subject to applicable municipal zoning districts, permits or variances where required, building-code requirements, and other applicable health and safety rules.
    • The statute defines manufactured housing as a single-family dwelling built offsite in a factory and compliant with applicable prevailing HUD standards; a manufactured home does not include a mobile home or housetrailer as defined in 15-1-101, MCA.
    • The source addresses municipal zoning and does not establish unrestricted occupancy on unzoned or county land statewide.
    “Zoning regulations adopted under this part may not treat manufactured housing or factory-built housing units differently from any other residential units.”
  • Accessory dwellingsAllowed (with conditions)

    Accessory dwelling units in jurisdictional areas where a Montana county has established zoning regulations under MCA Title 76, chapter 2, part 2.

    • The county zoning regulations must allow at least one accessory dwelling unit by right on a lot or parcel containing a single-family dwelling.
    • The unit may be attached, detached, or internal.
    • The county may not require owner occupancy, a familial, marital, or employment relationship between occupants, or impact fees; private restrictive covenants remain possible but cannot be required as a permit, license, or use condition.
    • A county may charge up to $250 for a one-time ADU application-review fee, in addition to usual building fees.
    • Applicable building codes, fire codes, and public-health and safety regulations still apply.
    • The county may require expedited sanitation review for an ADU on a parcel with existing public water and wastewater capacity; the 15-day expedited-review provision terminates September 30, 2029.
    • The statute applies to a county that exercises zoning powers; it does not itself create county zoning where none exists.

    maximum one-time application-review fee: <= 250 USD (Usual building fees may also be required.) · expedited sanitation review: 15 days (Parcel must have existing public water and wastewater service with capacity.)

    “In jurisdictional areas where the board of county commissioners has established zoning regulations under this part, the regulations must allow a minimum of one accessory dwelling unit by right on a lot or parcel that contains a single-family dwelling.”
    One more reviewed finding on this topic
    • Allowed (with conditions) — Accessory dwelling units in Montana municipalities that exercise zoning powers under MCA Title 76, chapter 2, part 3.
      “A municipality shall adopt regulations under this chapter that allow a minimum of one accessory dwelling unit by right on a lot or parcel that contains a single-family dwelling.”
  • Well permitLimited

    New groundwater developments in Montana using 35 gallons per minute or less and no more than 10 acre-feet per year.

    • All water uses starting after June 30, 1973, require a water right either through a water-use permit or an exception to the permitting process.
    • The development may qualify for the exception; qualification is not automatic.
    • Completed groundwater uses that meet the permit exception receive a Groundwater Certificate rather than a water permit.
    • A permitted water right is required for a combined appropriation from the same source by two or more wells or developed springs exceeding 10 acre-feet, regardless of flow rate.
    • All lots in a multi-phase subdivision must share a combined water-use limit of 10 acre-feet per year to qualify for a permit exception.
    • Beginning January 1, 2026, a water user intending to develop water use through a permit exception must file a Notice of Intent with DNRC before using water from an exempt well.
    • DNRC reviews a correct and complete Notice of Intent within 10 business days; if eligible, it authorizes the Notice of Intent and gives the user five years to complete the project, put the water to use, and file a Notice of Completion.
    • If the proposed use is not eligible, the Notice of Intent is denied and the user is directed to the water-right permit process.
    • The Notice of Intent filing fee is $400.
    • An authorized Notice of Intent expires after five years, with an opportunity for one five-year extension.

    maximum flow rate: <= 35 gpm · maximum annual volume: <= 10 acre-feet per year · Notice of Intent fee: 400 USD (Beginning January 1, 2026) · Notice of Intent review period: 10 business days (For a correct and complete Notice of Intent) · authorized Notice of Intent term: 5 years (One five-year extension opportunity is available)

    “Permit Exceptions, a.k.a. Exempt Wells: Small groundwater developments that use 35 gpm or less and do not exceed 10 acre-feet per year are known as “exempt wells” and may qualify for an exception to the water permit process.”
    2 more reviewed findings on this topic
    • Limited — New or expanded groundwater uses and wells in Cascade County under Montana water-rights law.
      “A water permit is required for all surface water use and groundwater uses over 35 gallons per minute (gpm) or 10 acre-feet per year.”
    • Required — Surface-water uses and groundwater uses exceeding 35 gallons per minute or 10 acre-feet per year in Montana.
      “Water Permits: A water permit is required for all surface water use and groundwater uses over 35 gallons per minute (gpm) or 10 acre-feet per year.”
  • Agricultural exemptionConditional

    Farm and ranch buildings in Cascade County areas under state building-permit jurisdiction.

    • State law exempts farm and ranch buildings from the state building-permit requirement.
    • Other county zoning, floodplain, septic, subdivision, or municipal requirements may still apply.
    “In the State's jurisdiction, state law exempts the following from the need to obtain state building permits: 1. farm and ranch buildings”
  • 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;”
    One more reviewed finding on this topic
    • Limited — Dispersed and designated-campground temporary camping on legally accessible Montana state trust land administered by DNRC.
      “Dispersed camping is allowed on state trust land with the appropriate permit and with certain restrictions. Dispersed camping on state trust land is allowed with a Conservation License. Camping that is incidental to hunting or fishing is permitted through your conservation license, and no additional permitting is required. Group camping requires a special recreational use license. On leased or licensed land: 2 days On unleased/unlicensed land: 16 days within a 30-day period Within designated campground: 16 days within a 30-day period”
  • county zoning authorityGeneral

    Montana county boards of commissioners' authority to adopt zoning regulations, including in unincorporated portions of established jurisdictional areas.

    • The board of county commissioners must have adopted a growth policy pursuant to Title 76, chapter 1.
    • Zoning may be adopted for all or parts of the jurisdictional area in accordance with Title 76, chapter 2, part 2.
    • Within unincorporated portions of an established jurisdictional area, the board may establish zoning regulations by resolution or divide the county into zoning districts.
    • Zoning regulations may regulate the erection, construction, reconstruction, alteration, repair, location, or use of buildings or structures and the use of land.
    • An action challenging creation of a zoning district or adoption of zoning regulations must be commenced within 6 months after the board's order.
    • Regulations in one district may differ from those in other districts.
    • The statute also states that zoning regulations may not treat manufactured housing or factory-built housing units differently from other residential units, subject to the statutory presumption concerning placement.

    challenge period: 6 months (after the date of the board order creating the district or adopting the regulations)

    “For the purpose of promoting the public health, safety, morals, and general welfare, a board of county commissioners that has adopted a growth policy pursuant to chapter 1 is authorized to adopt zoning regulations for all or parts of the jurisdictional area in accordance with the provisions of this part.”
    One more reviewed finding on this topic
    • General — Montana county boards of commissioners adopting zoning regulations for all or parts of their jurisdictional areas, including unincorporated portions where the statutory prerequisites are met.
      “a board of county commissioners that has adopted a growth policy pursuant to chapter 1 is authorized to adopt zoning regulations”
  • county building authorityGeneral

    Montana counties may adopt and enforce building codes and require construction permits for residential construction in unincorporated county areas, subject to the statutory certification, geographic, code-content, and permit requirements.

    • A county may adopt a building code by ordinance or resolution, or authorize adoption by administrative action.
    • A county may adopt its building code on a countywide basis unless a city or town within the county has adopted a building code; the county may not enforce its county building code within that city or town.
    • The county code-enforcement program must be certified by the Montana Department of Labor and Industry.
    • The current adopted code, current fee list, and current enforcement plan must be filed with and approved by the Department.
    • Inspectors must satisfy the stated state-licensing or approved national-certification requirements.
    • Except for voluntary incentive-based energy-conservation standards, the county may not adopt or enforce a building code more stringent than the code adopted by the Department or required by state law.
    • The county may prohibit construction from commencing until the required permit is issued after compliance is shown.
    • The general construction-permit requirement applies to buildings subject to Title 50, chapter 60, parts 1 through 4.
    • State agency-owned buildings remain under state Department jurisdiction for plan review, permitting, and inspections.
    “The local legislative body of a county, city, or town may adopt a building code to apply to the county, city, or town by an ordinance or resolution, as appropriate: (a) adopting a building code; or (b) authorizing the adoption of a building code by administrative action.”
    One more reviewed finding on this topic
    • General — Montana counties' authority to adopt and enforce building codes and require building-code administration for construction in county areas, including unincorporated areas.
      “The local legislative body of a county, city, or town may adopt a building code to apply to the county, city, or town by an ordinance or resolution, as appropriate: (a) adopting a building code; or (b) authorizing the adoption of a building code by administrative action.”

Still unanswered

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

  • Minimum dwelling size — Minimum floor area or dwelling size for residential dwellings in unincorporated Cascade County, excluding incorporated cities and towns and separately created zoning districts.
  • Minimum lot size — Minimum lot-size requirements in Cascade County zoning districts.
  • Setbacks — Setback requirements in Cascade County zoning districts.
  • Lot coverage — Lot-coverage requirements in Cascade County zoning districts.
  • Building height — Building-height requirements in Cascade County zoning districts.
4 more unanswered
  • Camping on your land
  • Tiny homes
  • Off-grid sanitation
  • Mandatory utility hookup

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 Cascade County, Montana

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

Cascade County scores 72/100 on the Bolthole Index, a strong county profile. Its strengths: a stronger property-autonomy legal backdrop and deep seclusion — about 4,017 people within 15 miles.

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

Cascade County requires a building permit only in limited cases (such as floodplains or specific zones), and it enforces county zoning. Onsite septic is permitted by Cascade City-County Health Department (CCHD). 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.

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

Living in an RV on your own land in Cascade County is limited to specific cases: Statewide rule. RV, camper-trailer, and other trailer overnight use for general recreation on legally accessible Montana state trust land administered by DNRC. A Conservation License is required for dispersed camping on state trust land. RV or trailer camping must be within 50 feet of a customary access point; motorized vehicles must be parked within 50 feet of a customary access point, and the camper or trailer may not be set up farther away by driving beyond that point. Confirm with the county before relying on it.

How much does land cost in Cascade County, Montana?

Land in Cascade County runs about $1,234 per acre, based on the latest county data.

What is the water situation in Cascade County?

Cascade County gets about 17" of rain a year, with severe drought in roughly 10.9% of years.

How remote is Cascade County?

A typical private-land location has about 4,017 people within 15 miles and 277,629 within 100 miles. These radius catchments are the published fallback where road routing is unavailable.

How Cascade compares in Montana

Compare side-by-side →See all 56 Montana counties ranked →