30 Tex. Admin. Code § 335.7
Authority to store, process, or dispose of industrial solid waste or municipal hazardous waste in accordance with a permit or post-closure order issued by the commission is contingent upon the execution and maintenance of financial assurance for the amount(s) specified in its permit in accordance with Chapter 37, Subchapter P of this title (relating to Financial Assurance for Hazardous and Nonhazardous Industrial Solid Waste Facilities), which provides for the closing of the solid waste storage, processing, or disposal facility in accordance with the permit or post-closure order issued for the facility and all other rules of the commission. The commission may require the execution and maintenance of financial assurance in accordance with Chapter 37, Subchapter P of this title for the closing of any solid waste facility exempt from the requirement of a permit under this chapter, but subject to the requirement of a permit or post-closure order under Texas Water Code, Chapter 26. Persons storing, processing, or disposing of hazardous waste are subject to further requirements concerning financial assurance and closure and post-closure contained in Subchapter F of this chapter (relating to Permitting Standards for Owners and Operators of Hazardous Waste Storage, Processing, or Disposal Facilities). If the executive director determines that there is a significant risk to human health and the environment from sudden or nonsudden accidental occurrences resulting from the operations of a solid waste storage, processing, or disposal facility, the owner or operator may be required to provide coverage for sudden and/or nonsudden accidental occurrences in accordance with Chapter 37, Subchapter P of this title.
30 Tex. Admin. Code § 335.7