GroundRosterZellerhoff ConstLicensed
License details
| 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 |
"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.
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 072 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), last checked 2026-08-19. Look it up at the issuing agency.
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