GroundRosterJohn Zierden
| Name | John Zierden |
| License number | 223831 |
| License type | Soil Tester |
| Location | Rhinelander, Wisconsin 54501 |
| Service area | Soil Testing |
| Phone | (715) 369-3905 |
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How to verify this license
We publish this listing exactly as it appears in Wisconsin's official licensing records; we do not vouch for the business itself. Before hiring, look up license #223831 directly with the state, confirm it is still active, and ask for a current certificate of insurance.
Source: Vilas County POWTS Program, last checked 2026-08-19. Verify at the official source.
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