Class 4 Blaster

License Information

Per Wis. Admin. Code § 305.20, no person may prepare explosive charges or conduct blasting operations unless the person holds a credential as a licensed Class 1 Blaster, licensed Class 2 Blaster, licensed Class 3 Blaster, licensed Class 4 Blaster, licensed Class 5 Blaster, licensed Class 6 Blaster, or licensed Class 7 Blaster or is under the direct supervision of a person who holds a credential as a licensed Blaster in one or more of the categories.

A person who holds a credential as a licensed Class 4 Blaster or is under the direct supervision of a person who holds a credential as a licensed Class 4 Blaster is limited to conducting blasting operation and activities not closer than 2,500 feet to an inhabited building for quarries, open pits, road cuts, trenches, site excavations, basements, underwater demolition or underground excavations.


Application for Licensure

FormDescription
3091Application for Class 4 Blaster License
3073​Fax Payment Form

Reinstate a Class 4 Blaster License that has been Expired more than 4 Years

Submit an application, supporting documentation and fee:

  • Application for Class 4 Blaster License (Form #3091)
  • $78.00 total fee ($15.00 application fee, $30.00 exam fee, $8.00 CIB fee and $25.00 late renewal fee)

Renewal Information

Requirements

  • FEE (See Renewal Dates and Fees)
  • Receive a passing score of 70% or greater on take home exam (sent by Department with renewal application).

Renewal Method

A renewal application and exam will be mailed by the Department at least 30 calendar days prior to the expiration of the credential.

  • Mail Renewal Reminder/Application to: 

Department of Safety and Professional Services

Trades Credentialing Unit
PO Box 78780
Milwaukee, WI  53293-0780


If you have questions regarding your renewal, please email DSPSCredTrades@wisconsin.gov.

When mailing your renewal, please allow up to 21 calendar days [per Wis. Admin. Code SPS § 305.04 (1)] from the date your payment is processed to receive an update regarding your renewal.