Bolthole Index

Audrain County, Missouri

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

72Index Score / 100
#48 of 115 in Missouri

Unincorporated Audrain County, Missouri does not require a county building permit for a home, and the county has no planning and zoning12. Inside cities such as Vandalia, the city's own zoning applies3. Septic permits come from the Audrain County Health Department, and work in county road right-of-way needs a no-charge special-use permit from Road and Bridge45.

At a glance

Building permit
Not required by Audrain County for a home in an unincorporated area1
Zoning
Audrain County has no planning and zoning for unincorporated land; Vandalia has its own zoning23
Septic
Audrain County Health Department; the published sewage-permit fee is $200 one time46
RV living
No county zoning restriction in unincorporated areas; sanitation and other rules still apply78
Tiny home
No county zoning restriction in unincorporated areas; sanitation and other rules still apply98
Owner-builder
No exemption was confirmed; the county home-building permit itself is not required in unincorporated areas101
Minimum home size
No county zoning-based minimum in unincorporated areas11
County-road access
A no-charge special-use permit is required for work in county-controlled right-of-way5

Who to call

Septic permits

Audrain County Health Department - Environmental Public Health Services

Residential onsite sewage systems and sewage permits under the Audrain County On-Site Sewage Ordinance

(573) 581-1332

info@myachd.org

1130 S. Elmwood Drive Mexico, MO 65265

Roads & driveways

Audrain County Road and Bridge Department

Special-use permits for work in Audrain County-controlled road right-of-way and entrance-pipe work in the Common #1 Road District

573-473-5895

Audrain County Courthouse, Room 206 101 N. Jefferson St. Mexico, Missouri 65265

Also useful

Audrain County Commission

General county questions when no specialized county office is identified

573-473-5822

101 North Jefferson Street, Mexico, MO, 65265, USA

Contact details are copied from each office’s official page and were checked against it on October 13, 2026.

Off-grid gear

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

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

No county home-building permit is required in unincorporated Audrain County, Missouri1. Unlike most counties around it in Missouri, Audrain County does not require a county building permit1. Missouri adopts fire and building codes locally rather than through one statewide code, and county building-code authority is limited by county classification and voter-approval rules1213. The county does not publish a residential building-permit procedure, so call the Audrain County Commission if a lender, insurer or contractor needs written confirmation14. The county's answer stops at city limits: Vandalia sets its own zoning, and cities such as Mexico may enforce their own building permits31. An owner-builder exemption could not be confirmed, but none is needed where the county requires no home-building permit10. Septic and road right-of-way permits remain separate155.

Who issues building, septic and road permits in Audrain County, Missouri?

Audrain County does not identify a general building or codes office for unincorporated home construction, so use the office that matches the permit you need1. The Audrain County Health Department handles residential onsite sewage systems and sewage permits at (573) 581-1332, info@myachd.org, and 1130 S. Elmwood Drive in Mexico16. Audrain County Road and Bridge handles special-use permits for work in county-controlled road right-of-way at 573-473-5895 in Room 206 of the county courthouse17. Applications are available from that office or by phone, and review may take up to 1 week after submission18. The Audrain County Commission, at 573-473-5822, takes county questions that fit neither office14. A driveway on Missouri Department of Transportation right-of-way instead requires a state permit19.

Does Audrain County, Missouri have zoning?

Audrain County has no planning and zoning for unincorporated land2. Unincorporated Audrain County therefore has no county zoning-based minimum dwelling size, minimum lot size, setbacks, lot-coverage limit or building-height limit, and publishes no zoning districts112021222324. Those answers cover county zoning only: septic, subdivision, floodplain and road right-of-way rules can still constrain a site2120. Zoning inside a city is separate: Vandalia has its own zoning chapter covering land in its corporate limits3. We could not confirm the zoning status of the county's other municipalities, so ask the city clerk before buying inside any city.

How do septic permits work in Audrain County?

Start an Audrain County septic project with the Audrain County Health Department, which administers residential onsite sewage permits under the county's On-Site Sewage Ordinance416. A construction permit is required for a residential onsite system on property smaller than 3 acres and for nonresidential systems regardless of parcel size25. Ask the Health Department how the county ordinance treats residential parcels of 3 acres or more before beginning work25. The department publishes a $200 one-time sewage-permit fee, but Missouri temporarily suspended onsite-sewage application fees effective August 28, 2026, so confirm the amount currently due2625. Only 0.1% of county soils are rated not limited for a conventional septic drain field, so expect a site evaluation and possibly an engineered system before fixing the house location or budget27.

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

Unincorporated Audrain County has no county zoning restriction on RV occupancy, temporary camping, tiny-home occupancy, manufactured-home occupancy or accessory dwellings72892930. These are zoning answers, not exemptions from sanitation, septic, floodplain, subdivision or health rules79. Missouri does not allow wastewater to be discharged onto the ground or into a road ditch, and local permitting authorities may impose additional requirements8. Discuss the wastewater setup with the Audrain County Health Department before placing or plumbing an occupied unit16. Incorporated municipalities may impose their own zoning and occupancy rules, but the Audrain County Health Department is the office for septic permits3132.

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

  1. Confirm that the parcel is in unincorporated Audrain County before relying on the county's no-zoning and no-home-building-permit answers21.
  1. Contact the Audrain County Health Department before choosing the house location; it administers residential onsite sewage permits, and conventional drain-field soil ratings are poor427.
  1. Identify whether access crosses county-controlled or state right-of-way519.
  1. Obtain the no-charge county special-use permit before work in county-controlled right-of-way, including owner-installed driveway or entrance pipes, allowing up to 1 week for review3318.
  1. Have a permitted contractor handle a new or repaired well or pump, unless the landowner uses Missouri's self-installation exception34.
  1. Ask the County Commission about floodplain administration, certificates of occupancy and inspections, because county-specific requirements could not be confirmed14.

What should you check before buying land in Audrain County?

Make septic feasibility a purchase contingency because only 0.1% of Audrain County soils are rated without severe limits for a conventional drain field27. Confirm the road authority and legal access because county-controlled right-of-way requires a special-use permit while state right-of-way follows a separate permit process519. Ask the County Commission whether the parcel lies in a participating floodplain jurisdiction because the statewide floodplain rule applies only to projects in designated flood-hazard areas within participating jurisdictions3514. Ask a well contractor about the state permit unless the landowner will use Missouri's self-installation exception34. Audrain County is predominantly gentle land, with 99% at a slope of 15% or less, but topography does not override site-specific soil, drainage or flood conditions36.

Watch-outs

  • The no-building-permit and no-zoning answers apply to unincorporated Audrain County; Vandalia has its own zoning, so verify municipal boundaries before buying or building23.
  • The Health Department publishes a $200 sewage-permit fee, while Missouri temporarily suspended onsite-sewage application fees effective August 28, 2026; ask the Health Department what is currently due25.
  • Only 0.1% of Audrain County soils are rated not limited for a conventional septic drain field, so confirm site feasibility early27.
  • Floodplain administration and county inspection requirements could not be confirmed; ask the County Commission before committing to a project14.

Sources

  1. Audrain County FAQ and Related Links (2026 county census)
  2. FAQ and Helpful Links — Audrain County Missouri, quoted and re-checked
  3. Vandalia: City of Vandalia, MO General Provisions (Audrain County), quoted and re-checked
  4. Environmental Public Health Services — ACHD, quoted and re-checked
  5. Road and Bridge — Audrain County Missouri, quoted and re-checked
  6. Environmental Public Health Services — Audrain County Health Department, quoted and re-checked
  7. FAQ and Helpful Links — Audrain County Missouri, quoted and re-checked
  8. health.mo.gov (Missouri statewide rule), quoted and re-checked
  9. FAQ and Helpful Links — Audrain County Missouri, quoted and re-checked
  10. (2026 county census)
  11. FAQ and Helpful Links — Audrain County Missouri, quoted and re-checked
  12. RSMo Section 64.170 (Missouri statewide rule), quoted and re-checked
  13. RSMo § 64.170 — County commissions control construction and issue building permits (Missouri statewide rule), quoted and re-checked
  14. Audrain County Commission (audraincounty.org)
  15. Environmental Public Health Services — Audrain County Health Department, quoted and re-checked
  16. Audrain County Health Department - Environmental Public Health Services (myachd.org)
  17. Audrain County Road and Bridge Department (audraincounty.org)
  18. Road and Bridge — Audrain County Missouri, quoted and re-checked
  19. Permits | Missouri Department of Transportation (Missouri statewide rule), quoted and re-checked
  20. FAQ and Helpful Links — Audrain County Missouri, quoted and re-checked
  21. FAQ and Helpful Links — Audrain County Missouri, quoted and re-checked
  22. FAQ and Helpful Links — Audrain County Missouri, quoted and re-checked
  23. FAQ and Helpful Links — Audrain County Missouri, quoted and re-checked
  24. FAQ and Helpful Links — Audrain County Missouri, quoted and re-checked
  25. OWTS Construction Permit Process, quoted and re-checked
  26. myachd.org, quoted and re-checked
  27. 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
  28. FAQ and Helpful Links — Audrain County Missouri, quoted and re-checked
  29. FAQ and Helpful Links — Audrain County Missouri, quoted and re-checked
  30. FAQ and Helpful Links — Audrain County Missouri, quoted and re-checked
  31. Environmental Public Health Services — ACHD, quoted and re-checked
  32. FAQ and Helpful Links — Audrain County Missouri, quoted and re-checked
  33. Road and Bridge — Audrain County Missouri, quoted and re-checked
  34. Water Wells - PUB2945, quoted and re-checked
  35. Laws and Regulations That Might Affect You if You Mine Sand or Gravel From Missouri Streams (Missouri statewide rule), quoted and re-checked
  36. Share of land at 15% slope or less: Bolthole Index county data

Written October 13, 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, Audrain County requires no county building permit for a home.

RuleAudrain CountyMonroe CountyMontgomery CountyCallaway CountyRalls CountyPike CountyBoone County
Building permitNot requiredRequiredRequiredNot requiredRequiredLimitedRequired
County zoningNoYesYesNoYesNoYes
Septic permitsCounty Health Dept.County Health Dept.County Health Dept.County Health Dept.County Health Dept.County Health Dept.County Resource Management

County locator

Audrain County in Missouri

72
County map
Audrain County highlighted among the Missouri counties · colored by Index score

How Audrain County scores

Seclusion56100% ev.
Self-Sufficiency51100% ev.
Admin Boringness8990% ev.
Durability64100% ev.
Property Autonomy47100% ev.
Carry Cost76100% 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 →

$196kTypical home
0.9%Property tax
$6,387Land / acre
41.4"Annual rain
7.1% of yrsSevere drought
12.4 / yr (+10.3)Mid-century 100°F days
15.8 daysMid-century dry spell
1.91" (+5.2%)Mid-century 1-day rain
1.81×Wildfire change factor
100%Forward climate coverage
$1,631Home insurance / yr
1.7% / yrInsurance growth
1.58%Nonrenewal rate
county median (2+ published ZIPs)Insurance basis
16,745People within 30 min
1,221,230People within 2 hr
25,081Radius comparison (15 mi)
35.2People / sq mi
0%Federal land
99%Land at 15% slope or less
0.1%Soils rated "not limited" for septic (strict USDA rating)
238 acWorkable land screen
13.7%Wooded land
63 tonsBiomass / forest ac
53.8°FAvg temp

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Cities and towns in Audrain 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: Village of Benton City · Farber · Laddonia · Town of Martinsburg · Mexico · Village of Rush Hill · Village of Vandiver

Answers from the rulebook for Audrain County

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

Audrain County rules

  • County-wide zoningAbsent

    Countywide planning and zoning authority administered by Audrain County.

    • The source does not address zoning administered by incorporated municipalities or other local jurisdictions.
    “Q: Does Audrain County have Planning & Zoning? A: No”
    One more reviewed finding on this topic
  • Zoning districtsNot published

    County zoning districts in unincorporated Audrain County.

    • The official county FAQ states that Audrain County does not have Planning & Zoning.
    • This does not address municipal zoning districts or non-zoning regulatory districts.
    “Q: Does Audrain County have Planning & Zoning? A: No”
    One more reviewed finding on this topic
  • Minimum dwelling sizeNone

    County zoning-based minimum dwelling-size controls in unincorporated Audrain County.

    • The county's official FAQ states that Audrain County has no Planning & Zoning.
    • This conclusion concerns county zoning-based dimensional controls and does not address building, health, septic, or other non-zoning rules.
    “Q: Does Audrain County have Planning & Zoning? A: No”
    2 more reviewed findings on this topic
  • Minimum lot sizeNone

    County zoning-based minimum lot-size controls in unincorporated Audrain County.

    • The county's official FAQ states that Audrain County has no Planning & Zoning.
    • Septic, subdivision, and other non-zoning rules may impose separate lot-size or site requirements.
    “Q: Does Audrain County have Planning & Zoning? A: No”
    2 more reviewed findings on this topic
  • SetbacksNone

    County zoning-based setback controls in unincorporated Audrain County.

    • The county's official FAQ states that Audrain County has no Planning & Zoning.
    • Non-zoning setback requirements may still arise under septic, floodplain, road right-of-way, or other rules.
    “Q: Does Audrain County have Planning & Zoning? A: No”
    2 more reviewed findings on this topic
  • Lot coverageNone

    County zoning-based lot-coverage controls in unincorporated Audrain County.

    • The county's official FAQ states that Audrain County has no Planning & Zoning.
    • This does not address non-zoning environmental, septic, floodplain, or building requirements.
    “Q: Does Audrain County have Planning & Zoning? A: No”
    2 more reviewed findings on this topic
  • Building heightNone

    County zoning-based building-height controls in unincorporated Audrain County.

    • The county's official FAQ states that Audrain County has no Planning & Zoning.
    • Building-code, airport, floodplain, or other non-zoning height restrictions were not resolved by this research.
    “Q: Does Audrain County have Planning & Zoning? A: No”
    2 more reviewed findings on this topic
  • Living in an RVUnrestricted

    County land-use zoning restrictions on RV occupancy in unincorporated Audrain County.

    • This absence claim is limited to county zoning; septic, health, floodplain, subdivision, and other applicable rules still apply.
    • The source does not address incorporated municipalities.
    “Q: Does Audrain County have Planning & Zoning? A: No”
  • Camping on your landUnrestricted

    County land-use zoning restrictions on temporary camping in unincorporated Audrain County.

    • This absence claim is limited to county zoning; septic, health, floodplain, subdivision, and other applicable rules still apply.
    • The source does not address incorporated municipalities.
    “Q: Does Audrain County have Planning & Zoning? A: No”
  • Tiny homesUnrestricted

    County land-use zoning restrictions on tiny-home occupancy in unincorporated Audrain County.

    • This absence claim is limited to county zoning; septic, health, floodplain, subdivision, and other applicable rules still apply.
    • The source does not address incorporated municipalities.
    “Q: Does Audrain County have Planning & Zoning? A: No”
  • Manufactured homesUnrestricted

    County land-use zoning restrictions on manufactured-home occupancy in unincorporated Audrain County.

    • This absence claim is limited to county zoning; septic, health, floodplain, subdivision, and other applicable rules still apply.
    • The source does not address incorporated municipalities.
    “Q: Does Audrain County have Planning & Zoning? A: No”
  • Accessory dwellingsUnrestricted

    County land-use zoning restrictions on accessory dwellings in unincorporated Audrain County.

    • This absence claim is limited to county zoning; septic, health, floodplain, subdivision, and other applicable rules still apply.
    • The source does not address incorporated municipalities.
    “Q: Does Audrain County have Planning & Zoning? A: No”
  • Who permits septicCounty

    Residential onsite sewage administration in Audrain County.

    • The Audrain County Health Department provides the cited environmental-public-health service under the Audrain County On-Site Sewage Ordinance.
    “Environmental Public Health Specialists (ESHS) provide a variety of services that include inspections of food establishments, residential onsite sewage systems/sewage permits through the Audrain County On-Site Sewage Ordinance, lodging establishment inspections, daycare licensure, temporary food permits, food recalls, and environmental issues/complaints.”
    2 more reviewed findings on this topic
    • Local — Residential onsite sewage regulation and permitting in Audrain County under the Audrain County On-Site Sewage Ordinance.
      “residential onsite sewage systems/sewage permits through the Audrain County On-Site Sewage Ordinance”
    • County (with conditions) — Residential onsite sewage services in Audrain County administered through the Audrain County Health Department.
      “residential onsite sewage systems/sewage permits through the Audrain County On-Site Sewage Ordinance”
  • Septic permitLimited

    Installation or repair of onsite wastewater/septic systems in Audrain County, including residential onsite sewage systems administered through the Audrain County On-Site Sewage Ordinance.

    • A construction permit is required for an onsite system on a residential property less than three acres.
    • A permit is required regardless of property size for other onsite systems serving non-residential structures.
    • The state page states that the residential-property exemption does not apply in some counties; Audrain County has its own On-Site Sewage Ordinance, so the county authority must be consulted for the ordinance-specific treatment of residential properties of three acres or more.
    • The Audrain County Health Department identifies itself as providing residential onsite sewage systems/sewage permits through the Audrain County On-Site Sewage Ordinance.
    • The Audrain County Health Department page lists a $200.00 one-time sewage-permit fee, but the state page states that application fees for onsite sewage disposal system construction, modifications, and repairs are temporarily suspended effective August 28, 2026.
    • DHSS regulations cover single-family residential systems and onsite or cluster systems treating domestic wastewater flows of 3,000 gallons per day or less and dispersing wastewater through soil treatment/absorption systems.
    • DNR regulates lagoons serving anything other than single-family residences, systems discharging to surface waters, systems with flows greater than 3,000 gallons per day that disperse through soil treatment/absorption systems, and industrial non-domestic wastewater systems.
    • DNR approval is required for subdivisions, mobile home parks, and campgrounds if onsite wastewater treatment systems are planned.
    • Some incorporated Missouri cities may not fall under a local permitting authority even when a county ordinance exists; for incorporated areas, the state page directs applicants back to DHSS.

    sewage permit fee: 200 USD (Audrain County page lists this as a one-time fee; Missouri DHSS states application fees are temporarily suspended effective August 28, 2026.) · residential property threshold: < 3 acres (Permit required below this threshold; state page says the exemption does not apply in some counties.) · domestic wastewater flow covered by DHSS: <= 3000 gallons per day (Higher-flow and specified other systems are regulated by DNR.)

    “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. [...] Agency: Audrain County Health Department Authority Type: Ordinance [...] County: Audrain [...] Contact the agency above for onsite wastewater permitting instructions. This county has their own Onsite Wastewater Ordinance and may have additional requirements beyond the state minimum construction standards.”
    One more reviewed finding on this topic
  • Driveway accessRequired

    Work in Audrain County-controlled road right-of-way, including owner-installed driveway or field entrance pipes.

    • A right-of-way Special Use Permit is required for any work performed on right-of-way controlled by Audrain County, including fencing, ditching, or dirt work.
    • The permit is no charge and applications may be obtained from the Road and Bridge Office or by telephone.
    • Allow up to one week after submission for review.
    • Pipes installed by the property owner or contractor require the same right-of-way Special Use Permit.
    • Other special-use conditions may apply depending on the type of work.
    • Audrain County right-of-way is typically 30 feet on either side of the road centerline, but may be wider or narrower.

    permit fee: 0 USD (right-of-way Special Use Permit) · review time: <= 1 week (allow up to one week following submission)

    “Pipes installed by the property owner or their contractor require a Right of Way Special Use Permit from Audrain County.”
    2 more reviewed findings on this topic
    • Limited — Driveway and field entrance pipes installed by a property owner or contractor in Audrain County right-of-way.
      “Audrain County Road and Bridge will install driveway and field entrance pipes within the Common #1 areas for county residents for a fee. Pipes installed by the property owner or their contractor require a Right of Way Special Use Permit from Audrain County.”
    • Required — Driveway and field entrance pipes installed by a property owner or contractor in Audrain County Common #1 road-district areas.
      “Audrain County Road and Bridge will install driveway and field entrance pipes within the Common #1 areas for county residents for a fee. Pipes installed by the property owner or their contractor require a Right of Way Special Use Permit from Audrain County.”
  • Permit feesPublished (with conditions)

    Sewage permit fees administered through the Audrain County On-Site Sewage Ordinance.

    • The health department page states that sewage permits have a $200.00 one-time fee.
    • The page does not identify whether the fee applies to every permit type or whether a newer fee schedule supersedes it.

    sewage permit fee: 200 USD (one-time fee)

    “sewage permits, which are a $200.00 one-time fee”
    One more reviewed finding on this topic
    • Published (with conditions) — Audrain County onsite sewage permits administered by the Audrain County Health Department.
      “sewage permits, which are a $200.00 one-time fee”
  • Permit processPublished (with conditions)

    Work performed on Audrain County-controlled road right-of-way, including fencing, ditching, dirt work, and property-owner or contractor-installed entrance pipes.

    • The permit is for county-controlled right-of-way, not a general building permit.
    • Applications may be obtained from the Audrain County Road and Bridge Office or by calling 573-473-5895.
    • Allow up to one week following submittal for review.
    • Other special-use conditions may apply depending on the type of work.
    • The county right-of-way is typically 30 feet on either side of the road center line, although it may be wider or narrower.

    application review time: <= 1 week (allow up to one week following submittal)

    “A right of way Special Use Permit is required, at no charge, for any work performed on the right of way controlled by Audrain County, including fencing, ditching or dirt work. Permit applications may be obtained from the Audrain County Road and Bridge Office or by calling 573-473-5895. Allow up to one week following submittal for review of permit applications.”
    One more reviewed finding on this topic
    • Partial — Audrain County right-of-way special-use permits.
      “Permit applications may be obtained from the Audrain County Road and Bridge Office or by calling 573-473-5895. Allow up to one week following submittal for review of permit applications.”
  • Building permitNot required

    Audrain County has no county planning/zoning and, as a non-charter rural Missouri county with no adopted building code, does not require a county building permit in unincorporated areas (municipalities like Mexico enforce their own codes). Corroborated by the state County Building Codes dataset (data.mo.gov iq7s-izvt, 2021): no county residential building code adopted.

    Audrain County FAQ and Related Links ↗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”
    2 more reviewed findings on this topic
  • 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.”
    One more reviewed finding on this topic
    • Limited — Inspections of existing onsite sewage systems in connection with property sales statewide in Missouri.
      “Missouri Department of Health and Senior Services' (DHSS) rules governing onsite sewage systems cover minimum construction requirements, system inspections at the time of property sales, and requirements for percolation testers and soil evaluators.”
  • 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.”
    One more reviewed finding on this topic
    • Allowed (with conditions) — Use of onsite wastewater treatment systems as off-grid sanitation where central sewer service is unavailable in Missouri.
      “In Missouri, where central sewer service is not available, homeowners and small business owners use various types of onsite wastewater treatment systems (OWTS).”
  • Well permitLimited

    Construction or alteration of a public well serving a Missouri public water system.

    • Public water systems must receive written approval from the Missouri Department of Natural Resources Public Drinking Water Branch before constructing or altering a public well.
    • The requirement does not apply when the system meets the charitable-and-benevolent-organization exemptions in section 640.116, RSMo.
    • Anyone proposing to install a public well must contact the department’s regional office for a well-site survey.
    • The survey addresses minimum isolation or setback distances from known or potential contaminant sources, including septic tanks, sanitary sewer lines, and landfills.
    • Before applying for construction authorization, the public water system must obtain an estimated casing-depth letter from the Missouri Geological Survey Water Resources Center.
    • There is no fee for the well-site-survey and estimated-casing-depth-letter services.
    • Failure to obtain construction authorization may result in approval delays and possibly require the owner to properly plug the well and drill a new one according to 10 CSR 60-3.

    public water system threshold: at least 15 service connections or regularly serves an average of at least 25 individuals daily, at least 60 days per calendar year

    “Public water systems must receive written approval from the PDWB before constructing or altering a public well”
    3 more reviewed findings on this topic
    • Required — Water-well construction or repair in Audrain County under Missouri statewide rules.
      “A non-restricted water well installation permit is required to construct or repair a water well in Missouri. [...] Landowners may install their own well or pump without a permit pursuant to the above mentioned law and rules.”
    • Required — A person or contractor conducting regulated work to drill, construct, repair, reconstruct, plug, or install pumps or pumping equipment in a water well, heat-pump well, monitoring well, or related well in Missouri.
      “A non-restricted permit is required to drill, construct, repair, reconstruct, plug, or install pumps or pumping equipment in a well.”
    • Limited — Construction or repair of water wells, installation or replacement of pumps, and associated plumbing and electrical work in Missouri.
      “A non-restricted water well installation permit is required to construct or repair a water well in Missouri.”
  • Agricultural exemptionAvailable (with conditions)

    Farm buildings and farm structures used for agricultural purposes under the county building and land-use restriction provisions of RSMo sections 64.800 to 64.905.

    • The exemption does not apply within incorporated portions of counties.
    • The exemption applies to raising crops, livestock, orchards, or forestry and to specified rice-farming or flood-irrigation impoundments.
    • For farm buildings or farm structures, the area must not be within the area shown on the flood hazard area map.
    • The statute preserves the validity of county ordinances or orders adopted before March 4, 1991.
    • Other laws and local requirements may still apply.

    rice-farming or flood-irrigation berm height: <= 18 inches (small berms placed around a field to hold water for growing rice or flood irrigation)

    “This section shall not apply to the erection, maintenance, repair, alteration or extension of farm buildings or farm structures used for such purposes in an area not within the area shown on the flood hazard area map.”
    4 more reviewed findings on this topic
    • Available (with conditions) — Erection, maintenance, repair, alteration, or extension of farm buildings or farm structures as against county fire-protection or fire-prevention ordinances.
      “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.”
    • Available (with conditions) — Erection, maintenance, repair, alteration, or extension of farm buildings or farm structures used for agricultural purposes under RSMo section 64.890, outside incorporated portions of counties and outside areas shown on flood hazard area maps.
      “This section shall not apply to the erection, maintenance, repair, alteration or extension of farm buildings or farm structures used for such purposes [...]”
    • Available (with conditions) — Farm buildings and farm structures statewide, with respect to county fire-protection and fire-prevention ordinances.
      “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 [...]”
    • Available — Erection, maintenance, repair, alteration, or extension of farm buildings or farm structures with respect to county fire-protection or fire-prevention ordinances.
      “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.”
  • Subdividing landLimited

    Subdivision plats in the unincorporated areas of counties covered by RSMo section 64.070 after the county commission adopts subdivision regulations.

    • The county commission must first adopt subdivision regulations.
    • The plat must first be submitted to the planning commission.
    • If the county planning commission does not report upon the plat within thirty days, it may then be deemed approved.
    • If amended or rejected by the planning commission, the action may be overruled and the plat approved only by the county commission, with the reasons for overruling spread upon the county commission minutes.
    • The recorder of deeds may not record the plat until receiving a certificate of authority from the county zoning enforcement officer.
    • The statute also permits a county planning commission, upon written request of an incorporated area's legislative body where there is no municipal planning commission, to pass upon subdivision plats within that incorporated area; those plats are subject to county planning commission rules and approval procedures.

    planning commission reporting period: 30 days (If no report is made, the plat may then be deemed approved.)

    “After the county commission shall have adopted such subdivision regulations, no plat of a subdivision of land within the unincorporated area of such county [...]”
    One more reviewed finding on this topic
    • Limited — Subdivision regulations adopted by Missouri cities, towns, or villages under RSMo section 89.410.
      “The planning commission shall recommend and the council may by ordinance adopt regulations governing the subdivision of land within its jurisdiction.”
  • 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.”
    One more reviewed finding on this topic
    • Required — All development in a Missouri floodplain, administered through the applicable community floodplain permitting process.
      “Regardless, some type of permit MUST be issued for ALL development in the floodplain.”
  • county zoning authorityLimited

    Missouri county zoning authority over unincorporated land.

    • RSMo § 64.850 applies to counties of the first class without a charter and counties of the second, third, or fourth class.
    • RSMo § 64.620 applies to counties of the second or third class to which §§ 64.510–64.690 apply.
    • Adoption under §§ 64.510–64.690 requires approval by vote of the people under § 64.530.
    • The authority applies in unincorporated portions and not incorporated portions.
    • The regulations must be in accordance with a comprehensive plan.
    • Under § 64.090, the zoning power does not apply to raising crops, livestock, orchards, or forestry; seasonal or temporary rice-farming or flood-irrigation impoundments; specified farm structures outside mapped flood-hazard areas; or underground mining entered through shafts outside mapped flood-hazard areas.
    • Existing lawful uses and specified public-utility services are protected under the cited statutory schemes.
    “the county commission of any county of the first class not having a charter form of government, or of any county of the second, third or fourth class may, after approval by vote of the people as provided in section 64.845, regulate and restrict, by order of record, in the unincorporated portions of the county, the height, number of stories, and size of buildings, the percentage of lots that may be occupied, the size of yards, courts and other open spaces, the density of population, the location and use of buildings, structures and land for trade, industry, residence or other purposes.”
    2 more reviewed findings on this topic
  • county building authorityLimited

    County authority to regulate residential construction and issue building permits in unincorporated areas of Missouri.

    • The authority under sections 64.170 to 64.200 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 one under those sections.
    • Only voters in the area affected by the proposed code may vote; incorporated-territory citizens cannot vote on a code affecting a county.
    • The county commission must hold at least three public hearings and provide the statutory newspaper publication and county posting notices before adoption.
    • Regulations adopted under section 64.180 apply to unincorporated territory, except as otherwise provided.
    • Adopted or amended codes after August 28, 2001, must use a current, calendar year 1999 or later edition of a nationally recognized building code, as amended.
    • A county building ordinance may not conflict with liquefied petroleum gas installations governed by section 323.020.

    public hearings before adoption: >= 3 hearings minimum (Section 64.180(3)) · newspaper notice: >= 15 days (Notice of hearing time and place must be published in at least two newspapers having general circulation within the county) · posted notice: >= 15 days (Notice must be posted in four conspicuous places in the county) · minimum nationally recognized building-code edition: >= calendar year 1999 edition year (Applies after August 28, 2001, under section 64.180)

    “The regulations adopted shall be applicable to the unincorporated territory of the county, except as otherwise provided herein”
    2 more reviewed findings on this topic
    • Limited — 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.
      “the county commission in all counties of the first and second classification [...] is for this purpose empowered [...] to adopt [...] regulations to control the construction”
    • Limited — Missouri counties' authority to require permits and regulate residential construction in unincorporated areas.
      “Before the adoption of such code of regulations, the county commission shall hold at least three public hearings thereon”

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 county construction requirements in unincorporated Audrain County.
  • Inspections — Building inspections in unincorporated Audrain County.
  • Certificate of occupancy — Certificates of occupancy for buildings in unincorporated Audrain County.
  • Local zoning — Aggregate local zoning status across Audrain County municipalities and unincorporated areas.
  • Mandatory utility hookup — Water and sewer connection requirements for unincorporated Audrain County property.
1 more unanswered
  • 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 Audrain County, Missouri

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

Audrain County scores 72/100 on the Bolthole Index, a strong county profile. Its strengths: low administrative friction for a quiet rural property and manageable long-term carry cost.

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

Audrain County does not require a county building permit for a home in unincorporated areas, and it has no county-wide zoning. Onsite septic is permitted by Audrain County Health Department - Environmental Public Health Services. 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 Audrain County?

Living in an RV on your own land in Audrain County is allowed: County land-use zoning restrictions on RV occupancy in unincorporated Audrain County. This absence claim is limited to county zoning; septic, health, floodplain, subdivision, and other applicable rules still apply. The source does not address incorporated municipalities. A tiny home is allowed. Confirm with the county before relying on it.

How much does land cost in Audrain County, Missouri?

Land in Audrain County runs about $6,387 per acre, based on the latest county data.

What is the water situation in Audrain County?

Audrain County gets about 41.4" of rain a year, with severe drought in roughly 7.1% of years.

How remote is Audrain County?

A representative private-land location has about 16,745 people within a 30-minute drive and 1,221,230 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.

How Audrain compares in Missouri

Compare side-by-side →See all 115 Missouri counties ranked →