Minnesota law requires Commercial Animal Waste Technicians (CAWT) to obtain a state license. If you apply or manage manure on a for-hire basis, you must be licensed. There are two categories, solid and liquid. An open-book exam is required as part of the license application.
Licensed Commercial Animal Waste Technicians
Local Ordinances Regulating Livestock in Minnesota
Minnesota Department of Agriculture (MDA), 625 Robert Street N, St. Paul, MN 55155-2538, firstname.lastname@example.org