GroundRosterWM Mueller Trenching and ExcavatingLicensed
| Name | WM Mueller Trenching and Excavating |
| License number | 38369 |
| License type | Onsite Wastewater Installer - Advanced |
| License status | Current registration |
| License expires | 2028-05-31 |
| Based in | St. Charles, Missouri |
| Counties declared to the state | Franklin, Jefferson, Lincoln, Pike, St. Charles, St. Louis, Warren |
| Phone | (636) 980-7757 |
"Based in" is the city on the business's state license record. That can be a mailing address; it doesn't tell you where the business works.
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What this license covers
- Installation / repair: licensed to build and install septic tanks and drainfields, and to repair or replace failed ones.
How to verify this license
We publish the license details exactly as they appear in Missouri's official licensing records; we do not vouch for the business itself. Before hiring, look up license #38369 directly with the state, confirm it is still active, and ask for a current certificate of insurance.
Source: Missouri registered onsite wastewater treatment system (OWTS) installers, last checked 2026-08-16. Verify at the official source.
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