Bolthole Index

Warren County, Missouri

Zoning, building permits and septic rules in Marthasville, Missouri

Marthasville is a city in Warren County, Missouri. Septic permits inside Marthasville come from Marthasville. 12 rules below are quoted from official sources and independently re-checked, most recently on November 5, 2026. Rules for unincorporated land are on the Warren County page.

Answers from the rulebook for Marthasville

Marthasville’s own rules

  • Building permitLimited

    Sewer or water main extensions, facilities, construction, and service connections inside Marthasville city limits.

    • The applicant must file the City form and receive a City construction permit before commencement.
    • The City withholds approval until permits are obtained from pertinent regulating agencies, including Missouri Department of Natural Resources, U.S. Army Corps of Engineers, and U.S. Environmental Protection Agency.
    “No sewer or water main extension or facility, construction or service connection shall be commenced without filing a construction permit application”
  • InspectionsLimited

    Connections to City water or sewer mains, facilities, or services inside Marthasville city limits.

    • A written final-inspection approval from appropriate City personnel is required before connection.
    • This claim does not establish a general inspection requirement for all building construction.
    “without obtaining a final inspection approval in writing from the appropriate City personnel prior to such connection”
  • Who permits septicLocal (with conditions)

    Private sewage disposal systems inside Marthasville city limits where a public sewer is not available under § 705.050.

    • The City's Superintendent signs private sewage disposal permits.
    • System type, capacity, location, and layout must comply with recommendations of the Missouri Department of Public Health and Clean Water Commission.
    “obtain a written permit signed by the Superintendent”
  • Septic permitRequired

    Construction of private sewage disposal systems inside Marthasville city limits.

    • The owner must obtain the Superintendent's written permit before construction.
    • The application uses a City form and must include plans, specifications, and other information deemed necessary by the Superintendent.
    • A $25 permit-and-inspection fee is due when the application is filed.
    • No subsurface soil absorption permit may issue for a lot under 20,000 square feet.

    private sewage disposal permit and inspection fee: 25 USD (Paid when the application is filed.) · minimum lot area for subsurface soil absorption permit: >= 20000 square feet (No permit is issued below this area.)

    “Before commencement of construction of a private sewage disposal system, the owner shall first obtain a written permit signed by the Superintendent.”
  • Septic inspectionRequired

    Permitted private sewage disposal systems inside Marthasville city limits.

    • A permit does not become effective until installation satisfies the Superintendent.
    • The applicant must notify the Superintendent before underground portions are covered when ready for final inspection.
    • Inspection must occur within 36 hours after notice, excluding Saturdays, Sundays, and holidays.

    inspection timing after notice: <= 36 hours (Excludes Saturdays, Sundays, and holidays.)

    “The inspection shall be made within thirty-six (36) hours of the receipt of notice by the Superintendent, excluding Saturdays, Sundays and holidays.”
  • Off-grid sanitationLimited

    Private sewage disposal and other off-grid sanitation facilities inside Marthasville city limits.

    • Privies, septic tanks, cesspools, and other sewage-disposal facilities are unlawful except as provided by Chapter 705.
    • Where public sewer is unavailable under § 705.050, a private sewage disposal system complying with Chapter 705 is required.
    • Construction requires the City's written permit and inspection.
    “Except as hereinafter provided, it shall be unlawful to construct or maintain any privy, privy vault, septic tank, cesspool or other facility”
  • Well permitRequired

    Wells dug, bored, or drilled to obtain water inside Marthasville city limits.

    • The applicant must obtain Board of Aldermen consent and permission before the work.
    • No permission may be issued for a well deeper than 255 feet.
    • Application requirements include compliance with County Board of Health, State Board of Health, and State Division of Geological Survey and Water Resources rules.

    maximum permitted well depth: <= 255 feet (No permission is issued for a deeper well.)

    “without first applying for and obtaining the consent and permission of the Board of Aldermen to do so”
  • Mandatory utility hookupConditional

    Houses, buildings, or properties for human occupancy, employment, recreation, or other purposes inside Marthasville city limits that abut a street, alley, or right-of-way containing a City public sanitary or combined sewer.

    • The owner must install toilet facilities and connect directly to the public sewer at the owner's expense within 90 days after official notice.
    • The rule applies when the public sewer is within 100 feet of the property line.
    • Where the public sewer is not available under § 705.050, the building sewer must connect to a compliant private sewage disposal system.

    public sewer distance from property line: <= 100 feet (Condition for mandatory connection after official notice.) · connection deadline after official notice: <= 90 days (For properties described in § 705.050.)

    “within ninety (90) days after date of official notice to do so, provided that said public sewer is within one hundred (100) feet”
  • Driveway accessRequired

    Construction or reconstruction of a street or driveway inside Marthasville city limits serving two or more residences or a commercial or industrial facility, including apartments and condominiums.

    • A City construction permit is required before construction or reconstruction.
    • The City code's scope excludes driveways not serving two or more residences or a commercial or industrial facility.
    “construct or reconstruct any street or driveway in the City of Marthasville which serves two (2) or more residences”
  • Building in a floodplainRequired

    Proposed construction or other development in Marthasville's numbered and unnumbered A Zones and AE Zones identified on specified Warren County FIRM panels.

    • A separate floodplain development permit is required for each structure or other development.
    • The permit is issued by the Board of Aldermen or its designated representative.
    • The ordinance applies to FIRM panels 29219C0289D, 29219C0293D, and 29219C0375D, dated November 4, 2009, as amended and future revisions.
    “A floodplain development permit shall be required for all proposed construction or other development, including the placement of manufactured homes”
  • Permit feesPublished (with conditions)

    Specified City private sewage disposal permits.

    • The cited fee is for private sewage disposal permits and inspections, not a general building-permit fee.

    private sewage disposal permit and inspection fee: 25 USD (Paid at filing.)

    “A permit and inspection fee of twenty-five dollars ($25.00) shall be paid to the City at the time the application is filed.”
  • Permit processPartial

    Private sewage disposal system permit applications inside Marthasville city limits.

    • The application must be made on a City-furnished form.
    • The applicant must supplement it with plans, specifications, and other information the Superintendent deems necessary.
    • This is a published process for private sewage systems only.
    “The application for such permit shall be made on a form furnished by the City”

Still unanswered

We looked and could not find an official answer yet. Silence is not permission; ask Marthasville or Warren County directly.

  • Owner-builder exemption — Owner-built dwellings inside Marthasville city limits.
  • Building code adopted — Buildings inside Marthasville city limits.
  • Certificate of occupancy — Buildings inside Marthasville city limits.
  • Local zoning — Land inside Marthasville city limits.
  • Zoning districts — Zoning districts inside Marthasville city limits.
10 more unanswered
  • Minimum dwelling size
  • Lot coverage
  • Building height
  • Living in an RV
  • Camping on your land
  • Tiny homes
  • Accessory dwellings
  • Agricultural exemption
  • Subdividing land
  • 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.

Unanswered questions are usually a sign that Marthasville publishes no rule on the point, not that none exists. Warren County’s page lists the county offices to call.

← All of Warren County: county rules, score and offices