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Semper Fi Excavation LLCLicensed

Licensed septic contractor based in Duluth, St. Louis County, MN

License details

CompanyNathan T Flanagan
License numberL4526
License typeSSTS Installer · Pipelayer
License statusCurrent
License expiresJune 29, 2027
Based inDuluth, 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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