Bolthole Index

Harrison County, Missouri

Building permits, zoning and land rules in Harrison County, Missouri

74Index Score / 100
#32 of 115 in Missouri

Unincorporated Harrison County, Missouri does not require a county building permit for a home, but the County Clerk should confirm the current status before construction12. County zoning could not be confirmed3. Most septic installations and repairs require advance approval from the Missouri Department of Health and Senior Services45.

At a glance

Building permit
Not required for a home in unincorporated Harrison County; confirm with the County Clerk12
Zoning
Countywide zoning could not be confirmed; ask the County Clerk before relying on a proposed use32
Septic
DHSS handles Harrison County; most installations and repairs need advance approval45
RV living
No county rule was confirmed; ask the County Clerk and DHSS about land use and sanitation324
Tiny homes
No county occupancy or minimum-size rule was confirmed; ask the County Clerk32
Owner-builder
No documented owner-builder exemption was confirmed6
Private well
Missouri requires regulated well-construction work to be done by licensed or permitted individuals7

Who to call

Building permits

Harrison County Clerk

First contact for current county building, zoning, road-access and land-use questions

660-425-6424

PO BOX 525 1505 MAIN ST BETHANY MO 64424-0525

Septic permits

Missouri Department of Health and Senior Services - Onsite Wastewater Treatment Program

Onsite wastewater construction permits and exemption determinations for Harrison County

(573) 751-6095 ext. 5

[email protected]

930 Wildwood Dr, Jefferson City, MO 65102

Online permits →

Floodplain permits

Harrison County Floodplain Administrator

County floodplain questions outside the listed incorporated communities

(660) 868-0709

1003 Factory Street Bethany, MO 64424

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 Harrison County, Missouri?

Unincorporated Harrison County does not require a residential building permit1. Missouri does not impose one uniform statewide building code; fire and building codes are adopted locally under state law8. The available state county-code listing shows no adopted Harrison County residential code, but we could not find a county page that explicitly states the permit answer1. Call the Harrison County Clerk at 660-425-6424 before ordering materials to confirm that the county's practice has not changed and to ask whether another approval applies to the site2. A project inside an incorporated city may face municipal rules that do not apply in unincorporated Harrison County8.

Who handles building and permit questions in Harrison County?

Harrison County does not identify a building department, so the Harrison County Clerk is the practical first contact for current county requirements12. The Clerk's office is at PO BOX 525 1505 MAIN ST BETHANY MO 64424-0525 and can be reached at 660-425-64242. Ask the Clerk to confirm whether the parcel is unincorporated, whether any county land-use approval applies, and which office controls an entrance onto the adjoining county road2. Septic is separate: DHSS, not the county health department, is the listed Harrison County onsite-wastewater authority4. Floodplain questions outside a listed city can go to the Harrison County representative shown by Missouri SEMA at (660) 868-07099.

Does Harrison County have zoning?

We could not confirm whether Harrison County has countywide zoning for unincorporated land3. Missouri law allows eligible counties to adopt zoning for unincorporated territory through the applicable voter-approval process, but that statewide authority does not prove Harrison County adopted it10. Ask the Harrison County Clerk for a current ordinance, zoning map or written confirmation before treating a parcel as unrestricted2. We also could not confirm county standards for minimum lot size, home size, setbacks, lot coverage or building height3. Missouri's protection for farm buildings concerns county fire-protection or fire-prevention ordinances and is not a blanket exemption from septic, floodplain, zoning or other land-use requirements11.

How do septic permits work in Harrison County?

The Missouri Department of Health and Senior Services is the listed onsite-wastewater permitting authority for Harrison County4. A construction permit is required before installing or repairing most onsite wastewater systems, although some single-family residential lots may qualify for an exemption5. Submit the information through the state request form to obtain an application number, or call DHSS at (573) 751-6095 ext. 5 before work begins12. Residential property smaller than 3 acres generally requires a permit, subject to the county-specific exceptions described by the state13. Harrison County's soil data rates 0% of mapped soils as free from severe limitations for a conventional drain field, so establish site and system feasibility before fixing the home location14. Larger-flow, direct-discharge and certain lagoon systems fall under Missouri DNR instead15.

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

We could not confirm a Harrison County rule that allows or prohibits living in an RV on private land, temporary camping, or tiny-home occupancy3. We also could not confirm a county minimum dwelling size or setback standard3. Ask the Harrison County Clerk for the rule applying to the parcel and proposed use before moving an RV or tiny home onto the land2. A lack of a residential building permit does not answer occupancy or wastewater questions because those are separate requirements15. Off-grid wastewater still requires a lawful disposal system: Missouri's onsite systems treat and dispose of domestic sewage on the property, and most construction requires approval16.

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

  1. Confirm with the Harrison County Clerk that the parcel is unincorporated and that no county residential building permit has been added12.
  1. Ask the Clerk for any current zoning, setback, county-road entrance or other land-use rule affecting the parcel32.
  1. Contact DHSS for an onsite-wastewater application number and do not start septic work until a permit or exemption is confirmed512.
  1. If the driveway enters MoDOT right-of-way, obtain the required state permit before constructing or modifying it17.
  1. Check mapped flood hazards and contact the Harrison County Floodplain Administrator before grading or building in a designated hazard area189.
  1. Use a Missouri-licensed or permitted well contractor for regulated water-well construction7.

What should you check before buying land in Harrison County?

Confirm the parcel's jurisdiction and land-use rules with the Harrison County Clerk because countywide zoning, setbacks and minimum sizes remain unconfirmed32. Test septic feasibility early because 0% of mapped county soils are rated without severe limitations for a conventional drain field14. Check flood maps and contact the county representative before development in a designated hazard area189. Verify whether road access meets a county road or MoDOT right-of-way, because MoDOT requires a permit for driveway work in its right-of-way while a county-road requirement could not be confirmed172. Harrison County's median property-tax bill is about $885 per year, with an effective rate near 0.8%1920.

Watch-outs

  • No residential building permit is required in unincorporated Harrison County, but confirm the current practice with the County Clerk before construction12.
  • Countywide zoning, RV occupancy, tiny-home rules, setbacks and minimum dwelling size could not be confirmed; ask the County Clerk for a parcel-specific answer32.
  • Harrison County's soil data rates 0% of mapped soils as free from severe limitations for a conventional septic drain field, so resolve wastewater feasibility before choosing a building site14.

Sources

  1. Missouri State Data - County Building Codes for Missouri (2026 county census)
  2. Harrison County Clerk (mocounties.com)
  3. (2026 county census)
  4. OWTS Construction Permit Process, quoted and re-checked
  5. OWTS Construction Permit Process, quoted and re-checked
  6. (2026 county census)
  7. Well and Pump Installation Contractor Permitting, quoted and re-checked
  8. RSMo Section 64.170 (Missouri statewide rule), quoted and re-checked
  9. Harrison County Floodplain Administrator (sema.dps.mo.gov)
  10. RSMo § 64.090 — Planning and zoning powers of county commission (Missouri statewide rule), quoted and re-checked
  11. RSMo Section 64.003 — Farm buildings and farm structures (Missouri statewide rule), quoted and re-checked
  12. Missouri Department of Health and Senior Services - Onsite Wastewater Treatment Program (health.mo.gov)
  13. OWTS Construction Permit Process (Missouri statewide rule), quoted and re-checked
  14. Share of soils without severe limits for a conventional septic drain field (USDA SSURGO): Bolthole Index county data
  15. On-site Septic Systems and Subdivisions (Missouri statewide rule), quoted and re-checked
  16. Frequently Asked Questions (Missouri statewide rule), quoted and re-checked
  17. Permits | Missouri Department of Transportation (Missouri statewide rule), quoted and re-checked
  18. Laws and Regulations That Might Affect You if You Mine Sand or Gravel From Missouri Streams (Missouri statewide rule), quoted and re-checked
  19. Median property tax bill: Bolthole Index county data
  20. Effective property tax rate: Bolthole Index county data

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

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County locator

Harrison County in Missouri

74
County map
Harrison County highlighted among the Missouri counties · colored by Index score

How Harrison County scores

Seclusion74100% ev.
Self-Sufficiency60100% ev.
Admin Boringness7868% ev.
Durability48100% ev.
Property Autonomy47100% ev.
Carry Cost8296% ev.

Evidence strength: 94%. This reports direct-source completeness and fallback use; it is separate from the score and is not a confidence interval. How it works →

$138kTypical home
0.8%Property tax
$3,799Land / acre
38.6"Annual rain
6.7% of yrsSevere drought
10.5 / yr (+8.7)Mid-century 100°F days
17.6 daysMid-century dry spell
2.11" (+7.4%)Mid-century 1-day rain
1.8×Wildfire change factor
100%Forward climate coverage
$1,882Home insurance / yr
3% / yrInsurance growth
1.5%Nonrenewal rate
single ZIP shrunk to state medianInsurance basis
5,482People within 30 min
2,411,764People within 2 hr
8,731Radius comparison (15 mi)
11.4People / sq mi
0.1%Federal land
88.5%Land at 15% slope or less
0%Septic soil without severe limits
0 acWorkable land screen
21.7%Wooded land
38.9 tonsBiomass / forest ac
51.8°FAvg temp

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Answers from the rulebook for Harrison County

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

Harrison County rules

  • Building permitNot required

    Missouri has no statewide residential building code and the state's county building-code listing shows no adopted building code for Harrison County, so the rural county does not require building permits in unincorporated areas. Corroborated by the state County Building Codes dataset (data.mo.gov iq7s-izvt, 2021): no county residential building code adopted.

    Missouri State Data - County Building Codes for Missouri ↗Scouted from the county site, not yet independently re-checked

Missouri rules that apply here

  • Building code adoptedPartial

    Missouri statewide legal framework for building-code adoption by counties and other communities; the statutes authorize local adoption rather than establishing one uniformly adopted statewide building code.

    • County authority under RSMo 64.170 applies to counties of the first and second classification.
    • A county that had not adopted a building code before August 28, 2001 must obtain voter approval before adopting under RSMo 64.170 to 64.200.
    • The adoption vote is limited to voters in the affected area; a code affecting a county is not voted on by citizens of incorporated territory.
    • A county adopting under RSMo 64.180 must use a current nationally recognized building code edition from calendar year 1999 or later, as amended.
    • A county building ordinance may not conflict with liquefied petroleum gas installation requirements governed by RSMo 323.020.
    • A community may incorporate a code by reference only if it otherwise has legal power to adopt the ordinance.
    • A code incorporated by reference must be filed with the community clerk and available for public inspection for 90 days before adoption.
    • An ordinance adopting a code by reference must state the penalty separately rather than incorporate the penalty by reference.
    • RSMo 67.280 defines community to include any county, fire protection district, or municipality, and municipality to include an incorporated city, town, or village.
    “Because fire and building codes are adopted at the local level in Missouri”
  • Who permits septicMixed

    Missouri wastewater treatment systems, including domestic onsite systems, larger-flow systems, direct discharges, lagoons, subdivisions, and industrial wastewater.

    • DNR regulates direct point-discharge or surface-land-application systems, non-individual lagoons, facilities exceeding 3,000 gallons per day, and industrial process waste.
    • DHSS or a local agency, typically the county health department, regulates single-family subsurface onsite systems, individual single-family lagoons, and qualifying systems at or below 3,000 gallons per day.
    • Local agencies may administer qualifying systems under local authority or ordinance.

    domestic wastewater flow threshold: <= 3000 gallons per day (DNR regulates facilities with domestic wastewater flow greater than 3,000 gallons per day)

    “In Missouri, different state and local agencies are responsible for regulating wastewater treatment systems.”
    One more reviewed finding on this topic
    • State (with conditions) — DHSS onsite-wastewater permitting authority for Harrison County.
      “Agency: DHSS Authority Type: DHSS Address: 930 Wildwood Dr, Jefferson City, MO 65102 County: Harrison Phone: (573) 751-6095 ext. 5 Website: N/A Alert: Submit the information at https://stateofmissouri.wufoo.com/forms/q1l2xmqk0yjvaut/ to request an application number.”
  • Septic permitRequired

    Installing or repairing most onsite wastewater treatment systems in Missouri, including residential systems subject to state permitting.

    • A construction permit is required before installing or repairing most OWTS.
    • Some single-family residential lots may be exempt.
    • For residential property less than three acres, a permit is required; the exemption does not apply in some counties, so the county authority must be checked.
    • Work should not begin until a permit is issued or an exemption is confirmed.
    • Effective August 28, 2026, application fees for onsite sewage disposal system construction, modifications, and repairs are temporarily suspended.

    residential lot threshold: < 3 acres (The exemption does not apply in some counties.) · temporary permit-fee suspension effective date: 2026-08-28 (Applies to application fees associated with onsite sewage disposal system construction, modifications, and repairs.)

    “A construction permit is required before installing or repairing most onsite wastewater treatment systems (OWTS). Some single family residential lots may be exempt from permitting.”
    One more reviewed finding on this topic
    • Required — Most onsite wastewater construction and repair work in Harrison County under DHSS authority.
      “A construction permit is required before installing or repairing most onsite wastewater treatment systems (OWTS). Some single family residential lots may be exempt from permitting.”
  • Septic inspectionLimited

    Inspection or evaluation of existing onsite wastewater systems in connection with Missouri real-estate transfers.

    • Local public health agencies generally no longer inspect existing systems for real-estate transfers.
    • A private licensed inspector may perform an inspection or evaluation.
    • A lender, buyer, or other transaction participant may require an assessment.
    • Some local standards may be more stringent than state regulations.
    • Inspections and evaluations are distinct; an inspection includes a hydraulic test, while an evaluation does not.
    “For the most part, local public health agencies no longer inspect existing systems related to real estate transfer. The help of a licensed inspector can be obtained to check the condition of the system.”
  • Off-grid sanitationLimited

    Off-grid domestic wastewater treatment using onsite wastewater treatment systems where central sewer service is unavailable.

    • Onsite systems treat and dispose of domestic sewage on the property where generated.
    • A construction permit is generally required, including for residential property less than three acres, subject to county-specific exceptions.
    • Wastewater may not be discharged into a road ditch or onto the ground.
    • Local permitting authorities may impose additional requirements.

    residential lot threshold: < 3 acres (The exemption does not apply in some counties.)

    “Onsite wastewater treatment systems are sometimes referred to as "septic systems." These systems treat and dispose of domestic sewage on the property where it is generated.”
  • Well permitRequired

    Construction of water wells in Harrison County by persons doing regulated well-construction work.

    • The source addresses contractor licensing/permitting rather than a separate landowner application requirement.
    • The source states permit fees of $150 effective April 1, 2024 for water-well permits and annual renewal requirements.

    permit fee: 150 USD (Effective April 1, 2024; applicable to each listed permit type, including water well.)

    “Individuals must test and become licensed/permitted in order to do business in Missouri to construct a water, heat pump or monitoring well.”
  • Agricultural exemptionAvailable (with conditions)

    Erection, maintenance, repair, alteration, or extension of farm buildings or farm structures as against county fire-protection or fire-prevention ordinances.

    • The exemption applies to fire protection or fire prevention ordinances adopted by counties in Missouri.
    • The statutory text addresses farm buildings and farm structures; it does not establish a general exemption from every zoning, building-code, floodplain, septic, or other land-use requirement.
    • Effective August 28, 2025.

    effective date: 2025-08-28

    “Notwithstanding any provision of law to the contrary, no fire protection or fire prevention ordinance adopted by any county in this state shall be exercised so as to impose regulations or to require permits with respect to the erection, maintenance, repair, alteration, or extension of farm buildings or farm structures.”
  • Driveway accessRequired

    Construction or modification of driveways within MoDOT right-of-way statewide.

    • A permit is required for construction of driveways and modifications to existing driveways on MoDOT right-of-way.
    • An initial online request must be submitted for each planned listed activity.
    • Engineered plans, traffic studies, hydraulic analysis, traffic-control plans, surety deposits, or performance bonds may be required depending on the work.
    • The rule does not establish a permit requirement for driveways outside MoDOT right-of-way.
    “We require you to obtain a permit to work on MoDOT's Right of Way for: Construction of driveways”
  • Building in a floodplainLimited

    Projects including mining, dredging, building construction, and other dirt-moving activities in designated flood hazard areas within participating Missouri jurisdictions.

    • The source describes local county or city flood damage reduction ordinances rather than one uniform statewide ordinance.
    • The project must be within a participating jurisdiction.
    • The project must be within a designated flood hazard area.
    • The cited rule does not apply if either condition is absent.
    • Covered projects must not raise flood heights.
    “Some jurisdictions (for example, county, city) require any projects in certain floodplains do not raise flood heights.”
  • Permit feesPublished (with conditions)

    Missouri Department of Natural Resources air construction permits statewide.

    • Fees apply to air construction permits, not to every Missouri building or land-use permit.
    • Construction permit fees include a filing fee and an hourly processing fee.
    • The filing fee depends on the type of construction permit.
    • The listed fees are effective January 1, 2026.
    • Fees applicable until December 31, 2025 are available on the Air Construction Permit Fees white sheet.
    • A convenience fee is charged for electronic payment.

    portable source relocation filing fee: 300 USD · minor permit filing fee: 300 USD · minor permit processing fee: per 100 USD (hour) · general permit filing fee: 700 USD · new source review filing fee: 6000 USD (plus $100 per hour processing fee) · prevention of significant deterioration filing fee: 6000 USD (plus $100 per hour processing fee) · hazardous air pollutant filing fee: 6000 USD (plus $100 per hour processing fee) · temporary or pilot filing fee: 250 USD (plus $100 per hour processing fee)

    “Construction permit fees include a filing fee and an hourly processing fee. The filing fee is dependent on the type of construction permit.”
  • Permit processPublished (with conditions)

    Permit applications for work on Missouri Department of Transportation right-of-way statewide.

    • The process applies to MoDOT right-of-way work.
    • Applicants may apply online, contact the area Traffic Specialist, or submit a hard-copy application by mail.
    • Additional documentation may be required depending on the work, including site plans, performance bond, certificate of liability, traffic studies, or a meeting with MoDOT personnel.
    • After issuance, Missouri One Call, a Notice of Intent, permit and approved-plan retention, and Traffic Specialist contact requirements apply.
    • Lane closures require a request at least two working days in advance and authorization before closing lanes.
    • The Traffic Specialist must be contacted at least 48 hours before beginning work and for necessary inspections.

    lane-closure advance request: >= 2 working days (authorization from MoDOT is also required) · Traffic Specialist pre-work contact: >= 48 hours (before beginning work)

    “Contact the Traffic Specialist a minimum of 48 hours prior to beginning work and for all necessary inspections.”
  • county zoning authorityGeneral

    Missouri counties adopting zoning regulations for unincorporated territory.

    • First-class charter counties are empowered under RSMo § 64.090; that section excludes first-class counties without a charter form of government.
    • A first-class noncharter county or a county of the second, third, or fourth class may establish county zoning under RSMo §§ 64.845 to 64.880 only after the zoning question is submitted to county voters and a majority of votes cast favors county zoning.
    • The authority applies to unincorporated portions or territory and does not apply to incorporated portions under § 64.090.
    • Section 64.090 excludes specified agricultural activities and certain farm structures, underground mining, and protects existing lawful uses subject to gradual elimination of nonconforming uses.
    “If a majority of the votes cast is in favor of county zoning, the county commission shall proceed with a program of county zoning”
  • county building authorityLimited

    County regulation of construction and issuance of building permits for buildings, including residential construction, in Missouri counties, with the practical focus on county-controlled areas outside incorporated territory.

    • RSMo § 64.170 grants the authority to counties of the first and second classification only.
    • The authority is subject to subsections 2 and 3.
    • A county that had not adopted a building code before August 28, 2001, under §§ 64.170 to 64.200, lacks authority to adopt one under those sections unless voters approve it.
    • The building-code authority vote is limited to voters in the affected area; a code affecting a county may not be voted on by citizens of incorporated territory.
    • The statute authorizes building regulations, building permits, inspections, licensing rules, and permit, license, and inspection fees.
    “the county commission in all counties of the first and second classification [...] is for this purpose empowered [...] to adopt [...] regulations to control the construction”

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 for residential construction in unincorporated Harrison County.
  • Inspections — Building inspections for residential construction in unincorporated Harrison County.
  • Certificate of occupancy — Certificates of occupancy for residential construction in unincorporated Harrison County.
  • County-wide zoning — Countywide zoning regulation in Harrison County.
  • Local zoning — Aggregate local zoning controls within Harrison County, including incorporated municipalities.
13 more unanswered
  • Zoning districts
  • Minimum dwelling size
  • Minimum lot size
  • Setbacks
  • Lot coverage
  • Building height
  • Living in an RV
  • Camping on your land
  • Tiny homes
  • Manufactured homes
  • Accessory dwellings
  • Mandatory utility hookup
  • Short-term rentals

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

Living off-grid in Harrison County, Missouri

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

Harrison County scores 74/100 on the Bolthole Index, a strong county profile. Its strengths: manageable long-term carry cost and low administrative friction for a quiet rural property.

Do you need a building permit in Harrison County, Missouri?

Harrison County does not require a county building permit for a home in unincorporated areas. Onsite septic is permitted by Missouri Department of Health and Senior Services (DHSS) - Onsite Wastewater Treatment Program. Rules change and cities within the county differ — always confirm with the county before you buy or build.

How much does land cost in Harrison County, Missouri?

Land in Harrison County runs about $3,799 per acre, based on the latest county data.

What is the water situation in Harrison County?

Harrison County gets about 38.6" of rain a year, with severe drought in roughly 6.7% of years.

How remote is Harrison County?

A representative private-land location has about 5,482 people within a 30-minute drive and 2,411,764 within two hours. The road-network catchments count population across county lines and clusters of smaller cities; straight-line radius values remain available as a comparison.

Off-grid gear

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

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How Harrison compares in Missouri

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