30 Tex. Admin. Code § 25.9
Accreditation must be based on an environmental testing laboratory's conformance to National Environmental Laboratory Accreditation Conference standards, Chapters 3, 4, and 5, adopted July 2002, and Chapters 1, 2, and 6, adopted June 2003 and the requirements of this chapter.
Source Note:The provisions of this §25.9 adopted to be effective September 12, 2002, 27 TexReg 8480; amended to be effective August 24, 2005, 30 TexReg 4841.