30 Tex. Admin. Code § 55.103
The following words and terms, when used in Subchapters D - G of this chapter (relating to Applicability and Definitions; Public Comment and Public Meetings; Requests for Reconsideration or Contested Case Hearing; and Requests for Contested Case Hearing and Public Comment on Certain Applications) shall have the following meanings. Affected person--A person who has a personal justiciable interest related to a legal right, duty, privilege, power, or economic interest affected by the application. An interest common to members of the general public does not qualify as a personal justiciable interest. The determination of whether a person is affected shall be governed by § 55.203 of this title (relating to Determination of Affected Person), or, if applicable under § 55.256 of this title (relating to Determination of Affected Person). Notwithstanding any other law, a state agency, except a river authority, may not file a request for a contested case hearing or request for reconsideration, nor may it be considered an affected person or named a party, or otherwise contest of a permit or license on an application received by the commission on or after September 1, 2011 unless the state agency is the applicant.
30 Tex. Admin. Code § 55.103