What this tracks
This dataset lists licensed installers of Onsite Wastewater Treatment Systems (septic systems) in Missouri.
Why it matters to you
If your home or business relies on a septic system, this list helps you find state-approved professionals for installations or repairs. Choosing an unlicensed installer could lead to fines or system failures. The data shows which contractors serve your county, their certification level, and when their license expires — critical checks before hiring.
How to read this data
business — The company name (e.g., “Bob Hamilton Plumbing”).
counties_served — Where the installer operates (e.g., “CASS,CLAY,JACKSON,PLATTE”).
installer_level — Certification tier (e.g., “Basic”), indicating the complexity of systems they’re approved to handle.
date_of_expiration — When the license lapses (e.g., “2026-05-31”).
Where this leaves you
This dataset doesn’t let you look anything up by your address, but it’s still a window into how the state operates. Read it to understand the scope of the program and what the official records contain; the city or state’s own interactive map (linked on this page) shows the locations involved.