Wisconsin Administrative Code ATCP 93 requires facilities that store, transfer, or dispense flammable, combustible or hazardous liquids to be registered with DATCP. The following types of tanks are exempt from the registration requirements:

• Aboveground tanks with a capacity of less than 5,000 gallons

• Tank vehicles

• Portable tanks, and moveable tanks that are located on a property for fewer than 24 months

• Tanks that are located at a US EPA superfund site

All in-use and temporarily-out-of-service storage tanks that are used to store a regulated substance must have a permit to operate from DATCP. The following types of tanks are exempt from the permitting requirements:

• Aboveground tanks

• Farm and residential underground storage tanks with a capacity of less than 1,100 gallons which are used for storing motor fuel

• Underground storage tanks storing heating oil for consumptive use on the premises

• Tanks located at a US EPA superfund site

To obtain a permit-to-operate application, please contact the Weights and Measures Bureau at 608-224-4942 or via email: datcpweightsandmeasures@wi.gov.

Permitting & Registration Fact Sheets

• ​Financial Responsibility: Insurance and Risk Retention Group Coverage 
• Storage Tank Permit to Operate Requirements
• Storage Tank Registration Requirements

Resources

• Storage Tank Database

• Fact Sheets for Leak Detection for Underground Storage Tanks

• Fact Sheets for Leak Detection for Underground Piping
  

• Contact Information for DATCP Permitting Staff

• UST Financial Responsibility Pollution Insurance providers

• Aboveground Flammable/Combustible Liquid Storage Tank Registration (TR-WM-118)

• Underground Flammable/Combustible Liquid Storage Tank Registration (TR-WM-137)