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ATB Professional Services, LLCLicensed

Licensed septic contractor based in Northfield, Dakota County, MN

License details

CompanyThomas F Wirtzfeld
License numberL4429
License typeSSTS Installer · Maintainer (Pumper) · Designer · Inspector · Service Provider · Pipelayer
License statusCurrent
License expiresMarch 25, 2027
Based inNorthfield, 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

Zellmer Excavating Services, LLCLicensed

Septic System Installation
Rick V Zellmer · Based in Inver Grove Heights, MN · License #L2507

Bakken Excavating LLCLicensed

Septic System Installation · Septic System Design
Ronald S Bakken · Based in Randolph, MN · License #L345

Otte Excavating IncLicensed

Septic Tank Pumping · Septic System Installation
Bryce R Otte · Based in Randolph, MN · License #L2887

Onsite Solutions Inc.Licensed

Septic Inspection · Septic System Design
Jason B Clarkin · Based in Burnsville, MN · License #L4419

Sauber Plumbing & Heating CoLicensed

Septic System Installation · Septic Inspection · Septic System Design
Jerome E Sauber · Based in Farmington, MN · License #L317

See every listing based in Dakota County or in Northfield.