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Boiler Inspection Requirements by State


Written By: Haley Richards, Marketing & Events Coordinator

Boiler inspections are crucial for the safety and efficiency of heating systems, particularly in regions with rigorous winters like the Upper Midwest. Each state within this area has its own specific set of regulations and requirements for boiler inspection to ensure that these critical systems operate safely and effectively. Since not every state is the same, it is essential to familiarize yourself with these requirements to ensure the safety, efficiency, and compliance of your heating system.  


Wisconsin’s Department of Safety and Professional Services oversees boiler inspections. Wisconsin requires all boilers and pressure vessels to undergo periodic inspections. The frequency of inspections varies depending on the type of boiler. Annual inspections are required for high-pressure steam boilers, while low-pressure steam and hot water heating boilers require inspection every 3 years. Following successful inspections, the state issues certificates, and these must be displayed prominently near the boiler. 

Department of Safety & Professional Services Boiler Inspection Certificates 


Minnesota’s Department of Labor and Industry is responsible for the inspection of boilers. The state mandates that both high-pressure and low-pressure steam boilers be inspected annually, and hot water heating boilers be inspected every 5 years by a licensed boiler inspector. External inspections are required while the boiler is shut down and open for internal inspections every other year. As in Wisconsin, certificates are issued upon the successful completion of the inspection, and they must be displayed prominently near the boiler. 


Michigan’s Department of Licensing and Regulatory Affairs is charged with the enforcement of boiler inspection laws. Michigan law stipulates that high-pressure steam boilers must be inspected annually if they are used for public assembly, located in schools, or large industrial buildings. Other boilers, such as low-pressure steam and hot water heating boilers, are required to be inspected every other year. Similar to Wisconsin and Minnesota, a certificate is issued upon successful completion of the inspection and must be displayed prominently near the boiler.  

Pressure vessel inspection by a PBBS Service Technician 

North and South Dakota 

In North Dakota, the Boiler Inspection Program oversees initial and periodic inspections of boilers of all sizes, types, and pressures. These inspections include requirements such as inspections every 3 years for hot water heating and low-pressure steam boilers, unless they are located in a nursing home, school, hospital, nursery school, or similar establishments, and annual inspections for high-pressure steam boilers. The state has standards governing the installation, operation, and closure of boilers, which are enforced by the Boiler Inspection Program. 

In South Dakota, boilers are subject to specific inspection requirements as well. For example, low pressure steam and hot water heating boilers must receive a certificate of inspection every other year with an internal inspection every four years, where applicable. High-pressure steam boilers should be inspected annually. The South Dakota Department of Public Safety enforces these standards as well as the installation, operation, and closure of boilers. 

The Upper Midwest’s cold climate makes boilers an indispensable part of many buildings. To maintain safety and efficiency, each state has developed specific inspection requirements that must be met. While the details may vary from state to state, the goal is the same: to prevent accidents, ensure public safety, and promote efficient operation. Failure to comply with state regulations can result in penalties, fines, and in severe cases, the forced shutdown of the boiler until it meets state standards. Moreover, regular inspections help identify potential issues early on, reducing the risk of boiler failures, costly repairs, and ensuring boilers operate at optimal efficiency, which is beneficial for both the environment and energy bills.  

Steven, a PBBS Equipment Service Technician, reviewing the maintenance checklist to ensure all necessary tasks are completed 

Knowing and following your state’s boiler inspection requirements is not just a legal obligation, but a critical measure for safeguarding your property and the people who use it. Contact PBBS Equipment today to help you prepare for your boiler inspection with an annual boiler service.

boiler room gauge

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