Wisconsin Statutes Health (Ch. 140 to 162) § 145.11. Advertising restrictions

(1) No person offering plumbing services may do any of the following, unless the person is a licensed master plumber or employs a licensed master plumber:

(2) No person other than a licensed master plumber shall use or display the title “Master Plumber” or append his or her name to or in connection with such title or any other title or words which represent or may tend to represent him or her as a licensed master plumber. Every holder of a master plumber's license shall promptly notify the department of any change of his or her business address.

(3) Any person who advertises as a master plumber through the use of printed material designed for public distribution shall include in the advertisement the number of his or her license as a master plumber. Any person who advertises as a plumbing contractor through the use of printed material designed for public distribution shall include in the advertisement the license number of the master plumber employed by the plumbing contractor.

(4) Subsection (1) does not apply to any person who advertises as providing services for which no license is required under s. 145.06, unless the person holds himself or herself out as providing services for which a license is required.