020-19 Wyo. Code R. § 19-3
The requirements of this chapter apply to all owners and/or operators of an underground storage tank as defined in W.S. 35-11-1415.
(a) This part applies to owners and/or operators of all petroleum underground storage tank systems as defined in Section 4 except as otherwise provided in this section.
(b) Owners and/or operators of petroleum underground storage tank systems are subject to these requirements if they are in operation on or after the date for compliance established in Section 4.
(c) State and federal government entities whose debts and liabilities are the debts and liabilities of a state or the United States are exempt from the requirements of this chapter.
(d) If the owner and operator of a petroleum underground storage tank are separate persons, only one person is required to demonstrate financial responsibility; however, both parties are liable in event of noncompliance. Regardless of which party complies, the date set for compliance at a particular facility is determined by the characteristics of the owner as set forth in Section 4.
020-19 Wyo. Code R. § 19-3