Texas SIP Background Information
Original Texas SIP submitted to EPA in 1972 by the Texas Air Control Board (TACB)
The original Texas SIP was submitted to EPA by the Texas Air Control Board (TACB) on January 31, 1972. On May 31, 1972, EPA conditionally approved in the Federal Register, beginning on page 10842 (37 FR 10842), the SIPs for all states. The Texas SIP was conditionally approved on pages 10895 to 10898. The status of the Texas SIP was codified in Title 40, Part 52 of the U.S. Code of Federal Regulations (40 CFR Part 52), Subpart SS, Sections 52.2270 to 52.2280. The Texas SIP Map document in this web site contains more historical information about the Texas SIP.
The regulatory element of the Texas SIP approved by EPA May 31, 1972, consisted of rules adopted by the Texas Air Control Board. The original numbering system used until about 1978 used the format "abc.d" where "a" was the regulation number, "bc" was the two-digit section (sometimes referred to as a rule) number, and "d" was a one to three digit subsection number. The number of digits in "d" indicated the level number.
A Texas Secretary-of-State numbering system, used between about 1978 and 1980, used a format of "131.08.00.00a(b)(c)" where "a" was the regulation number, "b", a lower-case alphabetical letter, was the section/rule designation, and "c", a number, was the subsection designation.
In about 1980, the Texas SIP air regulations were codified in Title 31 of the Texas Administrative Code (31 TAC), Chapters 101 to 119. Some of the Chapters were divided into subchapters and some subchapters were subdivided into undesignated headings. The text of the regulations were in sections.
Effective September 1, 1993, the Texas Air Control Board became the Air Division of the Texas Natural Resource Conservation Commission (TNRCC).
The Texas Air Control Board (TACB) became the Air Division of the Texas Natural Resources Conservation Commission (TNRCC) on September 1, 1993. The TACB air quality control regulations were transferred from Title 31 of the Texas Administrative Code (31 TAC) to new Title 30 of the Texas Administrative Code (30 TAC).
TNRCC replaced the outdated term “undesignated headings” in its rules with the term “division” in response to revised Texas Register rules published in the February 13, 1998 (23 TexReg 1289). These revisions were made to Chapter 115 in the amendments adopted by TNRCC August 29, 2002. In addition, the term “Centigrade” was replaced with the term "Celsius" which is now the term commonly used to describe this temperature scale.
Effective September 1, 2002, the TNRCC was renamed to the Texas Commission on Environmental Quality (TCEQ)
On September 1, 2002, the TNRCC formally changed its name and began doing business as the Texas Commission on Environmental Quality (TCEQ).