GroundRosterSeptic TechnologyLicensed
License details
| Company | Tim Baumann |
| License number | MI 100, 28 |
| License type | Installer ยท Onsite System Maintainer |
| License status | Active, King County certified master installer; Active, King County certified onsite system maintainer |
| Based in | Ellensburg, Kittitas County, Washington 98926 |
| Licensed by | King County |
"Based in" is the city and county of the address on the business's license record.
What this license covers
- Installation / repair: licensed to build and install septic tanks and drainfields, and to repair or replace failed ones.
- Pumping / cleaning: licensed to pump out and clean septic tanks, service them, and haul the waste.
How to verify this license
We publish the license details exactly as they appear in the public licensing records of the agency that issued the license; we do not vouch for the business itself. Before hiring, look up license #MI 100, 28 directly with the agency that issued it, confirm it is still active, and ask for a current certificate of insurance.
Source: King County Public Health - Master Installers (OSS) + King County Public Health - Onsite System Maintainers, last checked 2026-08-19. Look it up at the issuing agency.
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