- Complete the required trainings to get your registration ID card.
Do you need a state license in Missouri?
Missouri licenses some septic system work at the state level and leaves the rest alone. Which side of that line a job falls on decides whether you need the state license.
Steps to get licensed in Missouri
- Complete the department's required installer trainings.
- Register with DHSS before you install or make major repairs.
Experience and other requirements
Experience. Complete the required trainings to get your registration ID card.
The license to apply for. Onsite wastewater treatment system installer registration (Basic or Advanced).
Missouri septic installer exams
Trade exam. The official pages we read do not say. Check with the board (official site).
Business and law exam. The official pages we read do not say. Check with the board (official site).
What it costs in Missouri
We could not confirm the current fee schedule on an official page. Check with the board before you budget: Missouri Department of Health and Senior Services, Onsite Wastewater Treatment Program.
Insurance and bond
Insurance. The official pages we read do not say. Check with the board (official site).
Bond. The official pages we read do not say. Check with the board (official site).
Renewal and licenses from other states
Renewal. The official pages we read do not say. Check with the board (official site).
Reciprocity. The official pages we read do not say. Check with the board (official site).
After you are licensed
The license lets you take the work. Getting the work is the next job.
- Register the business. If you work under a name other than your own, register it where your state asks (often the Secretary of State, sometimes the county), and keep the name the same on your license, your truck and your invoices.
- Claim your Google Business Profile. It is the listing people see when they search for septic installation near them. Fill in your service area, hours and real photos of your work.
- Put up a website that shows the license. Customers look for it before they call. Koira builds a contractor website for you and keeps it current.
- See where you stand. The free Koira report checks how your business shows up in search and on maps against shops near you.
Where this comes from
Every fact on this page comes from the Missouri Department of Health and Senior Services, Onsite Wastewater Treatment Program and the official pages below, checked October 9, 2026. Fees and rules change, so confirm with the board before you file.