Septic installation and replacement in Boone County, Missouri
Boone County moved its onsite wastewater program: for years the rules were enforced by City of Columbia and Boone County Public Health and Human Services, and effective 28 June 2022 that responsibility transferred to Boone County Resource Management. Anything you were told before that date pointed at the wrong office. Two current details matter more than most. From 1 June 2026 a site and setback inspection has to be completed before the county will issue either a building permit or an onsite wastewater permit, which puts an inspection at the front of the process rather than the end. And if you are applying for a building permit for a new home, you do not file a separate wastewater application.
Who issues a septic permit in Boone County, MO?
The Boone County Resource Management, Inspections Division. 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 (573) 886-4339. Their page: Boone County Resource Management, Inspections Division.
Source: Missouri Department of Health and Senior Services, onsite wastewater construction permit authority lookup for Boone County, read 2026-08-26. Fees, forms and requirements change, and this county is the only current source for its own.
What does Boone County require beyond the state standard?
- Onsite wastewater regulation in the county was enforced by City of Columbia and Boone County Public Health and Human Services for several years, and effective 28 June 2022 that responsibility transferred to Boone County Resource Management. Source: Boone County Resource Management, onsite wastewater systems, read 2026-08-26.
- Effective 1 June 2026, a site and setback inspection must be completed before the county will issue either a building permit or an onsite wastewater permit. Source: Boone County Resource Management, onsite wastewater systems, read 2026-08-26.
- Where you are also applying for a building permit for a new home, you do not need to complete a separate wastewater permit application. Source: Boone County Resource Management, onsite wastewater systems, read 2026-08-26.
- The county requires a soil morphology report from a certified soil scientist submitted with the application, and publishes approved lists of soil scientists, installers and engineers. Source: Boone County Resource Management, onsite wastewater systems, read 2026-08-26.
- Residential lagoons are a normal system here, sized from a published table: a minimum surface area at the three foot operating level of 900 square feet for one or two bedrooms, 1,320 for three bedrooms and 1,760 for four, plus 440 square feet for each additional bedroom. Source: Boone County Guide to Onsite Wastewater Treatment Systems and Soil Properties, read 2026-08-26.
- The county asks for up to seven business days to review, and inspections require twenty-four hours notice. Source: Boone County Resource Management, onsite wastewater systems, 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 Boone County?
Boone County does not have one soil story, it has three, and which one you sit on decides what gets approved: glacial till in the north of the county, deep loess along the Missouri River hills, and residual soils over limestone toward the river breaks, with alluvium in the bottoms. The county publishes its own guide to onsite systems and soil properties precisely because the answer changes so much across the county. It is also why lagoons are an ordinary residential system here rather than an oddity.
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?
Boone County has Columbia as its county seat. Places served include Columbia, Ashland, Centralia, Hallsville, Rocheport, Sturgeon, Harrisburg, Hartsburg, McBaine, Midway, Huntsdale, Pierpont. 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 county publishes an adopted onsite wastewater fee schedule that took effect on 1 January 2026, and fees change, so no figure is repeated here. No minimum lot size or acreage for a septic or lagoon lot was found in the county chapter or its handouts. Whether Columbia, Ashland or another municipality in the county runs its own onsite permit process was not established.
Get a free quote from a septic contractor in Boone County
Tell us the county and the job. No email needed.
A marketing service, not a licensed contractor. Septic work is performed by independent local contractors.
Need the job done, not just the rule explained
Your request goes straight to an independent local septic contractor serving your Missouri county, usually within about an hour during the day, not a national lead list.
Tell us the county and the jobLast reviewed 2026-08-26.