Tex. Natural Resources Code § 91.109

(a) A person applying for or acting under a commission permit to store, handle, treat, reclaim, or dispose of oil and gas waste may be required by the commission to maintain a performance bond or other form of financial security conditioned that the permittee will operate and close the storage, handling, treatment, reclamation, or disposal site in accordance with state law, commission rules, and the permit to operate the site. However, this section does not authorize the commission to require a bond or other form of financial security for saltwater disposal pits, emergency saltwater storage pits (including blow-down pits), collecting pits, or skimming pits provided that such pits are used in conjunction with the operation of an individual oil or gas lease. Subject to the refund provisions of Section 91.1091, proceeds from any bond or other form of financial security required by this section shall be placed in the oil and gas regulation and cleanup fund. Each bond or other form of financial security shall be renewed and continued in effect until the conditions have been met or release is authorized by the commission.

(b) In addition to the financial security requirements of Subsection (a), a person required to file a bond, letter of credit, or cash deposit under Section 91.103 who is involved in activities other than the ownership or operation of wells must file the bond, letter of credit, or cash deposit at the time of filing or renewing an organization report required by Section 91.142 according to the following schedule:

(1) no bond, letter of credit, or cash deposit if the person is a:

(A) local distribution company;

(B) gas marketer;

(C) crude oil nominator;

(D) first purchaser;

(E) well servicing company;

(F) survey company;

(G) salt water hauler;

(H) gas nominator;

(I) gas purchaser; or

(J) well plugger; or

(2) a bond, letter of credit, or cash deposit in an amount not to exceed $25,000 if the person is involved in an activity that is not associated with the ownership or operation of wells and is not listed in Subdivision (1).

(c) A person who engages in more than one activity or operation, including well operation, for which a bond, letter of credit, or cash deposit is required under this subchapter is not required to file a separate bond, letter of credit, or cash deposit for each activity or operation in which the person is engaged. The person is required to file a bond, letter of credit, or cash deposit only in the amount required for the activity or operation in which the person engages for which a bond, letter of credit, or cash deposit in the greatest amount is required. The bond, letter of credit, or cash deposit filed covers all of the activities and operations for which a bond, letter of credit, or cash deposit is required under this subchapter.