Warren County, 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.
Sewer or water main extensions, facilities, construction, and service connections inside Marthasville city limits.
“No sewer or water main extension or facility, construction or service connection shall be commenced without filing a construction permit application”
Connections to City water or sewer mains, facilities, or services inside Marthasville city limits.
“without obtaining a final inspection approval in writing from the appropriate City personnel prior to such connection”
Private sewage disposal systems inside Marthasville city limits where a public sewer is not available under § 705.050.
“obtain a written permit signed by the Superintendent”
Construction of private sewage disposal systems inside Marthasville city limits.
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.”
Permitted private sewage disposal systems inside Marthasville city limits.
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.”
Private sewage disposal and other off-grid sanitation facilities inside Marthasville city limits.
“Except as hereinafter provided, it shall be unlawful to construct or maintain any privy, privy vault, septic tank, cesspool or other facility”
Wells dug, bored, or drilled to obtain water inside Marthasville city limits.
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”
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.
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”
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.
“construct or reconstruct any street or driveway in the City of Marthasville which serves two (2) or more residences”
Proposed construction or other development in Marthasville's numbered and unnumbered A Zones and AE Zones identified on specified Warren County FIRM panels.
“A floodplain development permit shall be required for all proposed construction or other development, including the placement of manufactured homes”
Specified City private sewage disposal permits.
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.”
Private sewage disposal system permit applications inside Marthasville city limits.
“The application for such permit shall be made on a form furnished by the City”
We looked and could not find an official answer yet. Silence is not permission; ask Marthasville or Warren County directly.
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.
Off-grid gear
Going off-grid in Marthasville means bringing your own water and power. The kit we’d start with:
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