GroundRosterZierke Soil Testing, LLCLicensed
| Name | Zierke Soil Testing, LLC |
| Company | Benjamin J Zierke |
| License number | L119 |
| License type | SSTS Designer ยท Inspector |
| License status | Current |
| License expires | 2028-04-14 |
| Based in | Chisago City, Chisago County, Minnesota 55013 |
| Phone | (651) 249-1346 |
"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
- Design: licensed to size and lay out a septic system for a specific site and soil condition.
- Inspection: licensed to inspect existing septic systems; the license you want for a home-purchase inspection.
How to verify this license
We publish the license details exactly as they appear in Minnesota's official licensing records; we do not vouch for the business itself. Before hiring, look up license #L119 directly with the state, confirm it is still active, and ask for a current certificate of insurance.
Source: Minnesota Pollution Control Agency (MPCA) - SSTS licensed business list, last checked 2026-08-17. Verify at the official source.
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