How to Verify a Wisconsin Porta Potty Company Is Properly Licensed

Wisconsin licensing rules for portable restroom servicing

In Wisconsin, any business that services or disposes of septage, including portable restroom waste, must hold a septage servicing license under Wis. Admin. Code ch. NR 113, administered by the Department of Natural Resources.

Source: Wisconsin Department of Natural Resources; Wisconsin Department of Safety and Professional Services, Wis. Admin. Code ch. NR 113 and ch. NR 114; Wis. Admin. Code ch. SPS 391. View the primary source. Verified August 2026.

What license does a Wisconsin porta potty company need?

A septage servicing business license under Wis. Admin. Code ch. NR 113, issued by the Wisconsin Department of Natural Resources.

Portable restroom waste is septage under Wisconsin law, so the business that pumps and disposes of it is regulated as a septage business rather than as a plumbing contractor. This surprises people who go looking for the supplier on the Department of Safety and Professional Services license lookup and find nothing. DSPS regulates the construction standards of the unit itself under ch. SPS 391; DNR regulates who may service it.

Who is allowed to service the units?

Each septage business must designate an operator-in-charge, and individuals servicing septage must be certified under ch. NR 114 as an operator-in-training, a certified septage vehicle operator, or a master operator.

There is one important exemption: portable restroom servicing assistants are exempt from certification. That is why a legitimate servicing crew can include uncertified assistants, provided they work under a properly certified operator. An uncertified assistant on the truck is not by itself a red flag.

The question most people forget to ask

Ask which legal entity will actually service your units, not just whether the company you are talking to is licensed.

Booking companies and brokers are common in this industry, and the name on your invoice is frequently not the name on the septage license. That arrangement is entirely legitimate, but you should know it before you book, particularly on public projects where sanitation compliance documentation may be requested. We disclose the licensed servicing entity for your placement on request before you book.

What construction standards must the unit itself meet?

Under Wis. Admin. Code ch. SPS 391, the storage chamber that receives human waste must be watertight, and the entire floor plus side walls to a height of at least 4 inches must be of material impervious to water.

These are the provisions that separate a compliant portable restroom from a repurposed enclosure. If you are inspecting units on delivery, the watertight tank and the impervious floor and lower wall surfaces are the two physical characteristics the Wisconsin code actually specifies.

A short verification checklist

Four questions will establish whether a Wisconsin supplier is operating properly.

One: which entity holds the NR 113 septage license that covers servicing of my units? Two: who is the designated operator-in-charge? Three: where is the septage disposed, and is that site approved? Four: is the company you are contracting with the licensed servicer or a booking intermediary? A supplier who cannot answer these quickly is worth a second look.

Key points

• Every septage business in Wisconsin must designate an operator-in-charge, and individuals servicing septage must be certified as an operator-in-training, a certified septage vehicle operator, or a master operator under ch. NR 114.
• A certification exemption exists for portable restroom servicing assistants, which is why a servicing crew may include uncertified assistants working under a certified operator.
• Under ch. SPS 391, the storage chamber of a portable restroom that receives human waste must be watertight, and the entire floor plus the side walls to a height of at least 4 inches must be made of material impervious to water.
• Portable restroom servicing sits under DNR septage rules rather than under DSPS plumbing licensure, which is a common point of confusion when verifying a supplier.

Frequently asked