GroundRosterUnderground Designs LLCLicensed
| Name | Underground Designs LLC |
| Company | Seth A Gravdahl |
| License number | L2951 |
| License type | SSTS Installer · Designer · Inspector · Pipelayer |
| License status | Current |
| License expires | 2028-07-02 |
| Location | Pequot Lakes, Minnesota 56472 |
| Phone | (218) 831-3980 |
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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.
- Installation / repair: licensed to build and install septic tanks and drainfields, and to repair or replace failed ones.
- Inspection: licensed to inspect existing septic systems; the license you want for a home-purchase inspection.
- Pipelaying: licensed to install the sewer line running from the building to the septic tank.
How to verify this license
We publish this listing exactly as it appears in Minnesota's official licensing records; we do not vouch for the business itself. Before hiring, look up license #L2951 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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