GroundRosterZellerhoff ConstLicensed
| Name | Zellerhoff Const |
| Company | Frank Zellerhoff |
| License number | MI 072 |
| License type | Installer |
| License status | Active - King County certified master installer |
| Based in | Vashon, King County, Washington 98070 |
| Licensed by | King County |
| Phone | (206) 463-6161 |
"Based in" is the city and county of the address 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 Washington's official licensing records; we do not vouch for the business itself. Before hiring, look up license #MI 072 directly with the state, confirm it is still active, and ask for a current certificate of insurance.
Source: King County Public Health - Master Installers (OSS), last checked 2026-08-19. Verify at the official source.
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