GroundRosterGreenworks of WashingtonLicensed
| Name | Greenworks of Washington |
| License number | MI 195, 150, 174, 57, KC2011-07 |
| License type | Installer · Onsite System Maintainer · Pumper/Hauler |
| License status | Active - King County certified master installer; Active - King County certified onsite system maintainer; Active - King County certified liquid waste pumper/hauler |
| Based in | Stanwood, Washington 98292 |
| Phone | (360) 913-0133 |
"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.
- 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 Washington's official licensing records; we do not vouch for the business itself. Before hiring, look up license #MI 195, 150, 174, 57, KC2011-07 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) + King County Public Health - Onsite System Maintainers + King County Public Health - Certified Liquid Waste Pumper/Hauler, last checked 2026-08-19. Verify at the official source.
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