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Transportation Conformity SIP and Rule Revisions

Information about Texas' transportation conformity SIP revisions and state rule.

The Texas transportation conformity State Implementation Plan (SIP) and rule spell out the state's interagency consultation procedures and incorporate by reference the federal transportation conformity rule. The most recent state revision was adopted by the Texas Commission on Environmental Quality (TCEQ) June 27, 2007, effective July 19, 2007. The U.S. Environmental Protection Agency (EPA) approval of this revision is pending.


The federal conformity regulation ensures transportation plans, programs, and projects in nonattainment and maintenance areas do not create new violations of the national air quality standards, do not increase the frequency or severity of violations, and do not delay timely attainment of the standards.

Section 176(c) of the Federal Clean Air Act Amendments of 1990 required each state to submit a conformity SIP revision no later than November 25, 1994. The original rule was published by the EPA November 24, 1993. The original Texas SIP revision was adopted by the Texas Natural Resources Conservation Commission (now called TCEQ) October 19, 1994, and approved by EPA November 8, 1995.

State SIP and Rule Revisions

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