Oregon Revised Statutes Public Health and Safety § 455.415

(1) A person who is licensed by the State Plumbing Board or the Department of Consumer and Business Services pursuant to ORS 460.057, 460.059, 479.630, 479.910, 480.630, 693.060, 693.103 or 693.111 must wear and visibly display an identification badge indicating the person's current license status while performing work for which the license is required. The authority that licenses the person shall specify the size and content of the identification badge and may establish such other specifications as the authority deems appropriate.

(2) Subsection (1) of this section does not apply if wearing or displaying the identification badge may create a danger to the public health or to the safety of the person or the public.

(3) This section does not require the display of a contractor or business license.