ATB Professional Services, LLCLicensed
License details
| Company | Thomas F Wirtzfeld |
| License number | L4429 |
| License type | SSTS Installer · Maintainer (Pumper) · Designer · Inspector · Service Provider · Pipelayer |
| License status | Current |
| License expires | March 25, 2027 |
| Based in | Northfield, Dakota County, Minnesota 55057 |
"Based in" is the city and county of the address on the business's license record.
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.
- Pumping / cleaning: licensed to pump out and clean septic tanks, service them, and haul the waste.
- Inspection: licensed to inspect existing septic systems; the license you want for a home-purchase inspection.
- Service: licensed to operate and service advanced treatment systems on an ongoing contract.
- 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 #L4429 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.
Other licensed septic contractors based in Dakota County
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Otte Excavating IncLicensed
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Sauber Plumbing & Heating CoLicensed
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See every listing based in Dakota County or in Northfield.