Final answer:
As of 2001, the State of Texas approved two plumbing codes: the International Plumbing Code (IPC) and the Uniform Plumbing Code (UPC).
Step-by-step explanation:
The question asks which two codes are the approved plumbing codes for the State of Texas as of 2001. The two approved plumbing codes for the State of Texas are the International Plumbing Code (IPC) and the Uniform Plumbing Code (UPC). These codes provide comprehensive regulations for plumbing systems, ensuring they are installed correctly and safely to protect public health and sanitation.