Tex. Health & Safety Code § 387.009

The commission may appoint advisory committees as necessary or desirable to assist the commission in performing its duties under this chapter. An advisory committee may include representatives of industry, environmental groups, consumer groups, local governments, agriculture, the commission, the General Land Office, and the Railroad Commission of Texas. Any senator or representative desiring to do so may participate on any advisory committee appointed under this section. Members of an advisory committee are not entitled to compensation.