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Semper Fi Excavation LLCLicensed
License details
| Company | Nathan T Flanagan |
| License number | L4526 |
| License type | SSTS Installer · Pipelayer |
| License status | Current |
| License expires | June 29, 2027 |
| Based in | Duluth, St. Louis County, Minnesota 55812 |
"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.
- Pipelaying: licensed to install the sewer line running from the building to the septic tank.
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 #L4526 directly with the agency that issued it, 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 2026-10-03. Look it up at the issuing agency.
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