020-19 Wyo. Code R. § 19-4
Compliance with Sections 4 and 6 includes the total number of owned and/or operated underground storage tanks, including not only those located in Wyoming, but also those located throughout the United States at all locations. Owners of petroleum underground storage tanks are required to comply with the requirements of this chapter by the following dates:
(a) All petroleum marketing firms owning 1,000 or more underground storage tanks and all other underground storage tanks owners that report a tangible net worth of $20 million or more to the U.S. Securities and Exchange Commission (SEC), Dun and Bradstreet, the Energy Information Administration, or the Rural Electrification Administration; January 24, 1989.
(b) All petroleum marketing firms owning 100-999 underground storage tanks; October 26, 1989.
(c) All petroleum marketing firms owning 13-99 underground storage tanks at more than one facility; April 26, 1991.
(d) All petroleum underground storage tank owners not described in paragraphs (a),(b), or (c) of this section, excluding all local government entities; December 31, 1993.
(e) All petroleum underground storage tank owners who are local government entities; February 18, 1994.
020-19 Wyo. Code R. § 19-4