Septic installation and replacement in Lincoln County, Missouri
Lincoln County runs its septic permitting through the health department’s Office of Environmental Sanitation under an ordinance it adopted in 1995 and revised in 1999. Two things about this county catch people out. There is no county zoning and no building permit outside city limits, so the septic permit is often the only county approval a rural build needs, which makes it the one that carries all the weight. And a public sewer within three hundred feet is grounds for denying the permit outright, which is a wider radius than most Missouri counties apply.
Who issues a septic permit in Lincoln County, MO?
The Lincoln County Health Department, Office of Environmental Sanitation. That is the office to call before anything else, because in Missouri the permitting authority is not the same kind of agency in every county, and assuming it is the health department wastes a week in the counties where it is not.
Phone (636) 528-6117. Their page: Lincoln County Health Department, Office of Environmental Sanitation.
Source: Missouri Department of Health and Senior Services, onsite wastewater construction permit authority lookup for Lincoln County, read 2026-08-26. Fees, forms and requirements change, and this county is the only current source for its own.
What does Lincoln County require beyond the state standard?
- Since the county ordinance passed, any construction, installation, modification or repair of an onsite sewage disposal system requires the property owner or their agent to obtain a permit from the county. Source: Lincoln County On-Site Sewage Disposal System Ordinance 1995-12, revised 1999, read 2026-08-26.
- The septic construction permit fee is one hundred dollars, published in the health department’s own onsite application packet. Source: Lincoln County Health Department, onsite application packet, read 2026-08-26.
- A construction permit will be denied where a public sewer is available within three hundred feet. Source: Lincoln County Health Department, onsite application packet, read 2026-08-26.
- A percolation test alone will not carry an application: the owner or agent must obtain a soil morphology evaluation from a qualified Missouri soil scientist. Source: Lincoln County Health Department, onsite application packet, step 3, read 2026-08-26.
- The county has no zoning and issues no building permits outside city limits, which is stated on its own planning and zoning page. Source: Lincoln County, Planning and Zoning, read 2026-08-26.
Missouri lets a county adopt standards more restrictive than the state's, so a requirement here is not evidence of the same requirement one county over.
Source: Missouri Department of Health and Senior Services, Onsite Wastewater Treatment, read 2026-08-26.
What is the ground like in Lincoln County?
Lincoln County sits north of the Missouri River, so glacial till is part of the picture, but the honest answer is that all three Missouri soil stories meet here: till uplands, loess-mantled ridges, and Mississippi bottomland alluvium along the eastern edge. That mix is what drives system selection, and it is why two properties a few miles apart in this county can need very different designs.
That matters because the soil decides the system. A standard system needs at least one foot between the trench bottom and the limiting layer or seasonal high water table, rising to four feet to groundwater or bedrock in highly permeable soils and in cherty clay soils in areas of severe geological limitations, and a percolation rate slower than sixty minutes per inch pulls a registered engineer onto the design.
The soil evaluation is what settles it for your particular lot.
Source: 19 CSR 20-3.060(5)(A)2., Missouri Code of State Regulations, read 2026-08-26.
Which towns does this cover?
Lincoln County has Troy as its county seat. Places served include Troy, Moscow Mills, Elsberry, Winfield, Hawk Point, Silex, Old Monroe, Foley. Anywhere in the county not on a public sewer is on a system this page applies to.
Who is allowed to do the work here?
An installer registered with the Missouri Department of Health and Senior Services. That is a state requirement rather than a county one, and it applies wherever you are. Some counties add their own licensing on top of it, which is one more reason to ask the permitting authority what they require before you sign anything.
How to check an installer's registration takes one phone call.
Source: Section 701.031, Revised Statutes of Missouri, read 2026-08-26.
What we could not confirm for this county
The ordinance read is the 1999 revision published by the health department; whether it has been amended since was not established. Requirements inside incorporated cities such as Troy may differ from the unincorporated county. Confirm the current fee and the current ordinance with the Office of Environmental Sanitation before relying on either.
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Tell us the county and the jobLast reviewed 2026-08-26.