Septic installation and replacement in Platte County, Missouri
Platte County is one of the more clearly documented septic counties in Missouri, and one of the few that publishes what it charges. Its ordinance names the county sanitarian as the permit issuer, sets a one hundred dollar construction permit fee and a seventy-five dollar fee for inspecting an existing system at a lender’s request, and gives the sanitarian five working days to act on an application. There is also a sequencing trap worth knowing before you plan a build: you cannot get a county building permit here without the septic approval already in hand.
Who issues a septic permit in Platte County, MO?
The Platte County Health Department, Environmental Health. 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 (816) 858-2412. Their page: Platte County Health Department, Environmental Health.
Source: Missouri Department of Health and Senior Services, onsite wastewater construction permit authority lookup for Platte County, read 2026-08-26. Fees, forms and requirements change, and this county is the only current source for its own.
What does Platte County require beyond the state standard?
- Before an onsite wastewater treatment system is installed in unincorporated Platte County, the homeowner is responsible for obtaining a permit from the health department. Source: Platte County Health Department, sewage program, read 2026-08-26.
- The county ordinance sets a fee of one hundred dollars for issuing a permit to construct an onsite sewage disposal system, and seventy-five dollars to inspect an existing system when a lending institution requests it. Source: Platte County ordinance, Section 235.150, read 2026-08-26.
- The sanitarian must act within five working days of receiving an application, with four possible outcomes: no permit necessary, accepted, denied, or approved with conditions. Source: Platte County ordinance, Section 235.050, read 2026-08-26.
- A permit can be denied where the building is within three hundred feet of a sanitary sewer to which connection is practical and permitted by the controlling authority. Source: Platte County ordinance, read 2026-08-26.
- The applicant must notify the sanitarian at least twenty-four hours before backfilling, and the sanitarian performs a final inspection before the system is buried. Source: Platte County ordinance, Section 235.090.D, read 2026-08-26.
- A soil morphology report has to be submitted with the application alongside the site layout illustration and the fee, so the soil work precedes the paperwork. Source: Platte County Health Department, application instructions, 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 Platte County?
Platte County is the glacial and loess case rather than the Ozark karst one, with a band of Missouri River alluvium along its southern and western edge. It sits entirely north and west of the Missouri River in the glaciated plains of northwest Missouri, over Pennsylvanian bedrock. The practical consequence is that slow-draining loess and till, and the water table in the bottomland, tend to set the design rather than shallow fractured limestone.
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?
Platte County has Platte City as its county seat. Places served include Platte City, Parkville, Riverside, Weston, Platte Woods, Weatherby Lake, Lake Waukomis, Northmoor, Houston Lake, Ferrelview, Edgerton, Camden Point. 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
Several of the health department’s own documents, including its standalone fee schedule and its subdivision onsite policy, sit behind a bot challenge and could not be read, so the fees above are the ordinance figures rather than a current schedule. Confirm them before relying on them. The county permits unincorporated Platte County; inside a city the answer can differ.
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Tell us the county and the jobLast reviewed 2026-08-26.